7Hz Aero

Berry108

New Head-Fier
7𝒉𝒛 𝑨𝒆𝒓𝒐 𝑹𝒆𝒗𝒊𝒆𝒘: 𝑳𝒊𝒈𝒉𝒕 𝒊𝒏 𝒘𝒆𝒊𝒈𝒉𝒕, 𝒂𝒏𝒅 𝒊𝒏 𝒕𝒉𝒆 𝒘𝒂𝒍𝒍𝒆𝒕
Pros: Light build and dense feel
Fit is universal
Good nozzle dimensions
Safe overall sound signature
Cheap
Cons: Fixed cable
People may find this too generic sounding
Lack of accessories
7𝒉𝒛 𝑨𝒆𝒓𝒐 𝑹𝒆𝒗𝒊𝒆𝒘: 𝑳𝒊𝒈𝒉𝒕 𝒊𝒏 𝒘𝒆𝒊𝒈𝒉𝒕, 𝒂𝒏𝒅 𝒊𝒏 𝒕𝒉𝒆 𝒘𝒂𝒍𝒍𝒆𝒕

|| 𝗜𝗻𝘁𝗿𝗼𝗱𝘂𝗰𝘁𝗶𝗼𝗻 ||

Most hobbyists by now know that 7hz is a household brand in the world of Chi-Fi. Offering a various amount of items from IEMs, to sources at different price points. In this review, we’d be tackling one of their cheapest sets available, the 7hz Aero.

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The Aero comes in at a price point of roughly $15 that comes in a single 9.2mm dynamic driver, fixed cable and 3 color options. This price range is often dominated by the infamous KZ which offers a more IEM-like shape with removable QDC cables.

Will the Aero be enough to warrant the $15 asking price in the area where IEMs come and go almost weekly? Or is it another failed attempt in offering a cheap way to get into 7hz’s array of products?


|| 𝗗𝗶𝘀𝗰𝗹𝗮𝗶𝗺𝗲𝗿𝘀 ||

I am in no way, shape, or form affiliated with the brands I review and do not give out preview privileges.

This set is sent in exchange for an honest review. There is no material or financial incentive for me to do this review and I guarantee no exchange has been done by both parties to influence or sway our opinions on this product.

My thoughts and opinions are of my own. My experience will entirely differ from everybody else. The contents of this review should not be considered factual as this hobby heavily leans on subjectivity. YMMV.

I don’t do rankings or tier lists as they can get outdated immediately as a reviewer can change their thoughts of a product to a certain extent. If you do want a recommendation then feel free to reach out so I can help out


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𝗜 𝗮𝗺 𝗻𝗼𝘁 𝗮𝗳𝗳𝗶𝗹𝗶𝗮𝘁𝗲𝗱 𝘁𝗼 7𝒉𝒛 𝗻𝗼𝗿 𝗿𝗲𝗰𝗲𝗶𝘃𝗲 𝗺𝗼𝗻𝗲𝘁𝗮𝗿𝘆 𝗶𝗻𝗰𝗲𝗻𝘁𝗶𝘃𝗲𝘀 𝗮𝗻𝗱 𝗳𝗶𝗻𝗮𝗻𝗰𝗶𝗮𝗹 𝗴𝗮𝗶𝗻𝘀 𝗮𝘀 𝘁𝗵𝗲𝘆 𝗽𝗿𝗼𝘃𝗶𝗱𝗲 𝗺𝗲 𝗮 𝗿𝗲𝘃𝗶𝗲𝘄 𝘂𝗻𝗶𝘁 𝗳𝗼𝗿 𝗮𝗻 𝗲𝘅𝗰𝗵𝗮𝗻𝗴𝗲 𝗼𝗳 𝗳𝗮𝗰𝘁𝘂𝗮𝗹 𝗮𝗻𝗱 𝘀𝗶𝗻𝗰𝗲𝗿𝗲 𝗳𝗲𝗲𝗱𝗯𝗮𝗰𝗸 𝗳𝗿𝗼𝗺 𝘆𝗼𝘂𝗿𝘀 𝘁𝗿𝘂𝗹𝘆.
𝗢𝗻𝗰𝗲 𝗮𝗴𝗮𝗶𝗻, 𝗜 𝘄𝗼𝘂𝗹𝗱 𝗹𝗶𝗸𝗲 𝘁𝗼 𝘀𝗲𝗻𝗱 𝗺𝘆 𝗴𝗿𝗮𝘁𝗶𝘁𝘂𝗱𝗲 𝘁𝗼 Linsoul Audio 𝗳𝗼𝗿 𝗽𝗿𝗼𝘃𝗶𝗱𝗶𝗻𝗴 𝘁𝗵𝗶𝘀 𝗿𝗲𝘃𝗶𝗲𝘄 𝘂𝗻𝗶𝘁. 𝗜 𝘁𝗿𝘂𝗹𝘆 𝗮𝗽𝗽𝗿𝗲𝗰𝗶𝗮𝘁𝗲 𝘁𝗵𝗲𝗶𝗿 𝗴𝗲𝗻𝗲𝗿𝗼𝘀𝗶𝘁𝘆 𝗮𝗻𝗱 𝘁𝗿𝘂𝘀𝘁 𝘁𝗼𝘄𝗮𝗿𝗱𝘀 𝗺𝗲 𝗮𝗻𝗱 𝗼𝘁𝗵𝗲𝗿 𝗿𝗲𝘃𝗶𝗲𝘄𝗲𝗿𝘀.

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| 𝗣𝗮𝗰𝗸𝗮𝗴𝗶𝗻𝗴, 𝗨𝗻𝗯𝗼𝘅𝗶𝗻𝗴 & 𝗔𝗰𝗰𝗲𝘀𝘀𝗼𝗿𝗶𝗲𝘀 |


It comes in a really tamed box with a window to see the said IEMs. You really can’t ask much at this price point so there is nothing surprising with the Aero having a straightforward packaging and unboxing experience.

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Just like the unboxing and packaging, 7hz is cutting corners with only 3 sets of ear tips for accessories

𝗜𝘁𝗲𝗺 𝗕𝗿𝗲𝗮𝗸𝗱𝗼𝘄𝗻:

7hz Aero IEMs
3 sets of translucent normal-bore ear tips (S/M/L)

Normally, this section is reserved for accessories like the cable and eartips. Seeing that the Aero has a fixed cable, I opt with doing it here instead. The cable that it comes with terminates in 3.5mm. It is not braided, but instead connected sideways akin to those budget flathead earbuds.

The cable itself is sticky at first but definitely weathered out as time passed. It is quite prone to tangling though along with not having a mic option. Overall quality is passable, at least it is better than those weirdly textured ones KZ bundle with their budget offerings that I find really jarring.

As for the ear tips, there isn’t much to talk about them. They are you run-of-the-mill stock tips that come with IEMs on varying price points.
Pretty lacking accessories, but other offerings in the price range often than not have the same lack of accessories so this isn’t much of a blow to its competency against others on the price bracket.


| 𝗕𝘂𝗶𝗹𝗱 & 𝗗𝗿𝗶𝘃𝗲𝗿 𝗖𝗼𝗻𝗳𝗶𝗴𝘂𝗿𝗮𝘁𝗶𝗼𝗻 |

7Hz made the Aero mostly out of plastic with a gold-painted segment in the middle with their logo. The material is somewhat see-through and is light, despite that it feels good in the hand with a nice dense feeling.

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The shape is very universal, this can definitely sit well with a decent chunk of ears out there. Add to that is the slim profile allowing you to make it sit in your ear without feeling bulky and heavy.

The nozzle is pretty nice too with good length and width along with a lip to keep ear tips in their rightful place with a single vent beside it. A nice addition too is 7hz’s signature mesh design on their budget Aero as well.

This set is offered in 3 different color variants with this one being the black version.


| 𝗜𝘀𝗼𝗹𝗮𝘁𝗶𝗼𝗻 |

It isolates as well as any other IEM in this price range. It can be a decent pair for traveling or commutes as the isolation can somewhat drone the noise of the outside world. There doesn’t seem to be a case of sound leakage here so your music privacy is most certainly kept hidden from the person next to you on your commute.


| 𝗖𝗼𝗺𝗳𝗼𝗿𝘁 |


It fits fantastically well with my ears. The combination of a light build and slim universal profile allows me to find the right position to get the perfect seal. I could definitely use this for hours on end with any sign of ear fatigue.

The occlusion effect on the Aero seems to be less severe than what we commonly see in IEMs. This could be because of the relatively slim profile mixed in with the a small plastic build allowing for a less pressure feeling on the ear.

** 𝗦𝘁𝗼𝗰𝗸 𝗲𝗮𝗿 𝘁𝗶𝗽𝘀 (𝗠𝗲𝗱𝗶𝘂𝗺) | 𝗧𝗿𝘂𝘁𝗵𝗘𝗮𝗿 𝗦𝗵𝗶𝗼(𝟯.𝟱𝗺𝗺) **

| 𝗗𝗿𝗶𝘃𝗮𝗯𝗶𝗹𝗶𝘁𝘆 |

Only having to power a single dynamic driver makes the Aero quite an easy set to drive. I find that plugging it straight to sources is often enough to have satisfying volume from the little fellas.

You can easily go overboard with powering this so take it easy with the gain dial whenever plugging these on.

|| 𝗦𝗼𝘂𝗻𝗱 ||

The 7hz Aero brings a warm, balanced sound signature that leans on the smoother side without harshness. Its tuning is rather "vanilla," prioritizing an easygoing and inoffensive presentation that doesn't call too much attention to any one frequency range.

|| 𝗕𝗮𝘀𝘀 ||

The Aero’s bass response focuses more on midbass than subbass, with minimal rumble in the lowest frequencies. Midbass hits are punchy and satisfying, although not the hardest-hitting in its class. Thankfully, there's no bleed into the mids, keeping the bass clean and controlled, though the bass isn’t especially forward.

|| 𝗠𝗶𝗱𝘀 ||


Vocals and instruments in the midrange sound quite lean, with a decent amount of air and detail. There's a slight touch of warmth, but not enough to classify it as lush or thick. The presentation here is smooth, with minimal sparkle. Sibilance is absent, making it a comfortable listen even with brighter vocals. The timbre remains natural, though some listeners might find it a touch dry.


|| 𝗛𝗶𝗴𝗵𝘀 ||

The treble is well-controlled and on the safer side, which prevents any harshness but also results in a more relaxed top end. Detail retrieval is adequate, but it lacks the sparkle and energy that could add more excitement to the sound.


|| 𝗧𝗲𝗰𝗵𝗻𝗶𝗰𝗮𝗹𝗶𝘁𝗶𝗲𝘀 ||


On the technical front, the Aero offers a respectable performance. The soundstage is decent, providing a natural sense of space, and imaging is precise, ensuring instruments are well-defined in their positions.

Layering is average, but separation is solid, so it never feels congested even with busier tracks. While it’s capable in technical aspects, it might not satisfy those seeking a more immersive or highly detailed experience.

This can be a decent choice for gaming but other more immersive forms of entertainment may find the lack of subbass and wide soundstage can make such media sounding not as expansive or have depth.


|| 𝗖𝗼𝗻𝗰𝗹𝘂𝘀𝗶𝗼𝗻𝘀 ||

Sound-wise, this is quite a safe choice especially for beginners. It offers a bit of everything to get beginners started in their hobby. Despite that the lack of a removable cable can be a really big deal for people seeing as even cheaper options offer that feature, and it being a jack-of-all-trades can go against being too spread out for someone looking for something specific in their sound.

If you are a beginner looking for an all-around set and don't want to get into setting money aside for cables then this can be a decent option for you, but for others who have identified their tastes, you might want to do more research if this is your next purchase.

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Redcarmoose

Headphoneus Supremus
Pros: Price $14.99
Feather weight at only 2 grams each
Incredibly small, maybe one of the single smallest IEMs I have reviewed
Non-microphonic cable
Great timbre
U-shaped tone
Still holding the 7Hz house sound yet you get what you pay for
Just amazing how much more you can get out of this little IEM from a audiophile Dongle upgrade or DAP
Pretty much feels like you have nothing in your ear
Cons: Just OK sounding from a phone output or regular Apple Dongle
Non-detachable cable, yet cable is of high quality with robust joining at the IEM themselves
Depending on your signature likes or dislikes, a better value than a drugstore IEM due to holding an audiophile tune
Could maybe have been better set-up for cable down use
The 7Hz Aero Universal IEM
Redcarmoose Labs August 28th, 2024
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7Hz:
In 2018 a team of music enthusiasts and engineers got together to test their skills. Somewhere along the way they chose 7Hz as the company name. In 2021 7Hz released the 14.2mm Planar magnetic "Timeless" IEM. The Timeless IEM gained a reputation for best technical resolvability under $300.00. The Timeless, priced at $199.00 to $219.00 seemed like the answer to everyone's prayers? The unique Timeless CNC shell and double-sided N52 magnet array didn't hurt matters any! So in many ways 7Hz has brought imagination to market. I mean why make an IEM if it is like all the rest that have been previously made by the other guys? So marketing unusual yet ergonomic shapes has been one stand-out feature held in 7Hz reputation. The next thing is the sound, 7Hz has explored a sound that holds a nice balance while style coming-off polite, still (at the same time) exciting. I have tested and reviewed my share of 7Hz products, as such a stand-out few have been the Zero and 7Hz Zero 2, the new TOTL Flagship, the Hybrid Aurora. Probably the fun here is meeting up with a noticeable amount of 7Hz passion for the industry. Yep, imagination for something new that never existed before, with 7Hz simply exploring the possibilities of in-ear sound creation.

Yet 7Hz is now entering the value sector with a $14.99 9.2mm single full-range dynamic driver. Really the concept for the day is “How small can you go.”

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The 7Hz Aero IEM:
Coming in three colors offered goes that extra mile to reinforce the ’toy-like” quality of the Aero. Your choice of Black, Blue or Red is available. What is not available is a detachable cable, the wiring here is permanent. As such we are reminded of IEMs from years ago when changing cables was not an option. Though the 2024 feature is this cable is dynamite. Yep, fluid and functional, I mean if they were looking for a single cable to join the Aero to…..I am pretty sure they found it. The single question is why didn’t they make the Aero a cable down design. To where due to the incredibly low weight, we don’t need ear-hooks to keep the Aero in place, or even ever moving for that matter. The Aero is like “Air” in your ears. The first thing I did after burn-in was walk around the house with just the Aero in my ears hooked to nothing.

And while super comfortable, the noise exclusion was sub-par for the course. Now that is not necessarily a bad thing, as when the music is on all is well.


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Drivability:
Yet from a simple Samsung 3.5mm phone output or Apple Dongle there was a slight rebelliousness to ever get really loud. Now this concept of drivability will be a topic of prolonged discussion in the review. Number one, why would you make a 9.2mm single full-range driver for an ultra portable “sports” headphone/IEM and therefore make it on the hard to drive side of life? I mean common sense says you should be able to at least hook it to an Apple Dongle and away you go, to the Gym, or walking?

To where the personality of the Aero is a firm U shape response. As such we have sub-bass over mid-bass. While the stage is medium, the midrange is fairly balanced and even the treble is fairly OK for the money. Though taking the Aero and adding the wired output to the 7Hz Artimis39 Bluetooth amplifier device became a noticeable up-scale. Then I tried Bluetooth only and sure enough getting the Aero a little juice seemed to level the signature and even reduce any stridence in the treble, which could be found if pushing it to the limit of where it could go.



Listening to The Eagles Hotel California (2013) remaster from YouTube was maybe the element the 7Hz Aero was supposed to be in. And really for the most part listening to the 3.5mm output from the Samsung phone, or the Apple Dongle from a phone by itself was really not bad, still this wouldn’t be Head-Fi without complicating affairs. My question is if I would rather listen to the 7Hz Zero or Zero 2 straight from the Apple Dongle? I will get to the answer later……….but now we have comparisons to take place.

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Comparisons:
1) SIMGOT AUDIO EW100 DSP (Left)
2) TANGZU Princess Chang Le (Right)


SIMGOT AUDIO EW100 DSP:
Sure in many ways this is not comparable, yet let’s see how it is. Price is $19.99, the same as the SIMGOT AUDIO EW100 (non-DSP) unit. Only the reason I chose this too is because it has an attached cable. The attached cable with the permanent DSP effects meant there was no way to directly figure out if the EW100 DSP was tuned the same as the regular 3.5mm detachable plug EW100. Still we will try somehow to learn which is better, or which could be preferred. The other concept that comes to mind is why wouldn’t a person just get a TWS IEM instead of these different cabled models. To answer that, really in some ways these have better sound than the entry TWS I have tried. My ideas here, and I’m no expert, but you need to start spending at least $150.00 or more for comparable wireless sound.

Sure much of this comes down to tuning, meaning if any of these three ultra-budget IEM being tested today get closer to your desired sound signature tune, well then that will maybe be the one you ultimately choose. So best one, is really the best one for you.

Still OK, I’ll spill the beans now. My only question is why would someone get any of these when you have the 7Hz Zero and 7Hz Zero 2 on hand for a purchase? In fact upon release the 7Hz Zero was $19.99. Both Zeros have slightly risen in price to roughly $10.00 more than the asking price for this Aero………but my question is why wouldn’t you just get the Zero or Zero 2 and call it a day. While the Zero and Zero 2 are noticeably bigger, there is a better midrange acceptance with them that’s unarguable, regardless of tune preference. While many believe the Zero 2 is a more compete and mature form of tune, really this Areo has better bass than the Zero 1? Still it is all about the stage and the mids in the Zero 1, and really the Zero 2 also is not too shabby in how it does mids. Both I would choose as a recommendation over anything in the above picture here, sorry that is just honestly how I feel. But you do see the naming resemblance right……Aero/Zero? And sure the two do have some tune similarities, it just the Zero and Zero 2 are real IEMs…..not a toy kinda like we have with the Aero. I mean sure it sounds fine, but the pure musical involvement only goes so far in daily use. I don’t want to be a snoot or too much of an elitist here with this budget stuff, as there is a place in the world for under $20.00 sound design, and sure you can maybe go to the Gym with the Aero, but I would rather take my hit in sound quality and just use a cheap set of $40.00 TWS IEMs simply out of the sake of convenience.

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Anyway…….the EW100 DSP:
The first thing we note is how the DSP is a noticeable effect. Now this DSP effect has been somehow reduced into sounding fairly natural with the new EW300 DSP. Again it is a little hard to try and guess what SIMGOT did to the tune with the DSP because we can’t take the cable off to hear the DSP on its own, or the EW100 DSP from a straight analog 3.5mm cable. Yet after hearing a few IEMs in my day I will at least conceptualize the effects here and the difference from the Aero. Number one, I would much rather have this EW100 DSP in my ears than the Aero playing from a 3.5mm output (like the Apple Dongle) or a Samsung 3.5mm phone output.

Why? Well even though it is processed, it still has the SIMGOT sound. Literally I can visualize the guys in the SIMGOT back room………laughing and reclining back in their chairs and saying, yes! We will move forward on this sound signature tune. To where the EW100 DSP is slightly fake sounding, that fake additive is acceptable……to me anyway, due to everything coming-off more musical and involving. The DSP is using its magic to fill-out the stage broader (than the Aero) and adding instrument and vocal size to this playback. To where we are not reaching the Aero sibilance effects at louder volume, instead bigger deeper bass, added mid bass (remember the Aero is sub-bass)………and this is all about the EW100 DSP imaging........because it is simply bigger and better. It’s clearer…….

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TANGZU Princess Chang Le:
The Princess was coming in at just $12.00 when released. Though now the price is $15.00. The Princess came out in July of 2023, and really appeared very different from IEMs I have had before. Mainly the fact that the shape (as seen in these photos) is incredibly small, and the cable is also fixed. The very first benefit I see is the Princess cable is designed for straight down placement. Now maybe you would say, hay…….simply turn the Aero upside down……well children, it doesn’t exactly work that way, to keep this short, you can’t. Now I was hoping to actually like the Princess better in these back to backs……I’m not sure why, maybe the name Princess here? Anyway, out of a regular 3.5mm phone jack the two IEMs suffer a little from the same issue; they are slightly difficult to drive. Having that far-away sound a little. Yet switching to the wired 7Hz Artimis39 the sound of both IEMs is drastically improved. Yep, everything from stage size to imaging girth, to clarity of presence. Only now the sound signature tune difference between the Princess and Aero is more noticeable. Reason being you hear the IEM character as closer and more personable, so you start to discover new ideas as to sound results and playback qualities presented. With the EW100 DSP, we are left with only the TypeC DSP amplifier.

Anyways the difference here is the mids and treble of the Aero are more pushed-out, the extra mid-bass abilities of the Princess on additive, make that difference even more profound. So here is me listening...........right? I’m not doing anything that’s exactly hard to do……..just sitting around and plugging stuff in and out and reporting in the end. I am basically trying to keep this as simple as I can. Still a lot simply depends on what end-sound you are after. Still the Princess was thicker and richer and more musical thus more interactive, for me anyway? :)

To where sure I can hear the 7Hz sound inside the Aero, and yes, it is true to the family name as far as a tuning goes, it is just I kind of think they simply tried to do what works with the sound of the up line models here, and for whatever reason, that sound while holding a somewhat great amount detail, to me is not wholesome enough? It is not note-weight thick enough…….so in turn I would suggest the Zero or 7Hz Zero 2 as a way to fully grasp what 7Hz is about (near this price-point) or look elsewhere.

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Packaging:
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Build:
Here 7Hz is sandwiching two half pieces with a metal top and seperate "drop" creation. Looking at the back we see a top vent then another back vent near the top of where the cable enters. 10 points for 7Hz building a significant cable join area with sufficient strain-relief. As such we find a 2 gram low-weight entity with included structural integrity. Really when you look at the design you only wonder if it may not give enough ear feedback simply due to hardly touching the ear and extremely low weight?

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Conclusion:
Sure I will talk about other options you have in regards to source. Though keep in mind most are not going to go walking around town with a giant DAP on-person to somehow enlighten the Aero sound. Meaning there are ways we can thicken-up and fortify the Aero sound, yet no matter which source we use, the Aero only goes so far. The Aero is simply itself most of the time.

Probably the best union with the Aero was the HiBy R3 II DAP join. Here we are gifted with an M DAP sonic signature. To where now all of a sudden the end of the bass presence seemed to be lowered, that or the HiBy R3 II was moving forward with bass control, which I liked. At just $179.00 and super small as a micro-DAP......the Hiby had many enjoyable traits to give. The R3 II then mids were again lowered slightly, giving a more controlled and accessible tone to me anyway.

For my money the DSP EW100 was a smoother and a bigger sound, more note-weighty affair. Especially using the TypeC DSP provided in comparison to a phone or Apple Dongle with the Aero. But a lot of this could ultimately be tune preference. Remember early on in this review I talked about the exact tune being super important to how we chose these ultra-budget choices. And in no way am I saying that I have the final word here, I may just not like the tuning, that is how idiocentric this whole game is.

While I don’t review too many IEMs at this price point, I have tried to keep an open mind and keep this review centered in the best of ways. In the end, the Aero is just what it is, for this listener anyways. And while truly given the asking price the Aero does move forward with good technicalities, especially timbre. The thickness of the stage go miles in a way to include the listener with an experience of being involved to a point with the music. Probably the best compliment I could five the Aero is that it does absolutely nothing wrong. Totally careful and correct in so many ways.

What we have is a nice stage design, a competent, even, complete and correct tune and a set of technicalities that are fair for the price, only you have to bring the Aero to an amplifier to totally realize this.

And sure, while capable and very even handed from a phone output, it was probably the lack of pace definition that spoiled the party the very most being used as such?

Sure the noise occlusion could be an issue, the non-detachable cable, maybe an issue, yet at the price of $14.99 you could look at the Aero as disposable, maybe. One thing for sure, 7Hz went to the full effort to include great stress relief on the cable joins where the cable enters the IEM. The cable itself is well built and has a metal covering of the 3.5mm plug. The cable has a fully functioning chin-cinch and is all around non-microphonic. So if 7Hz had to permanently attach a cable to the Aero, they went and chose a great one. The Aero comes with 6 fully functional ear-tips too.

$14.99

https://www.linsoul.com/products/7hz-aero

7HZ
Model AERO
Impedance 27Ω
Sensitivity 104dB/V @ 1kHz

Driver 9.2mm Dynamic Driver

Linsoul website: https://www.linsoul.com/
Linsoul Aliexpress Store: https://ddaudio.aliexpress.com/store/2894006
Linsoul USA Amazon Store link: https://www.amazon.com/s?i=merchant-items&me=A267P2DT104U3C

Disclaimer:
I want to thank Kaitlyn of Linsoul for the love and the 7Hz Aero review sample.

Disclaimer:
These are one persons ideas and concepts, your results may vary.

Equipment Used:
Sony WM1A Walkman DAP MrWalkman’s Firmware 3.5mm single ended
Sony WM1Z Walkman DAP MrWalkman’s Firmware 3.5mm single ended
Sony TA-ZH1ES DAC/AMP Firmware 1.03 3.5mm single ended
Electra Glide Audio Reference Glide-Reference Standard "Fatboy" Power Cord
Sony Walkman Cradle BCR-NWH10
AudioQuest Carbon USB
Samsung Phone 3.5mm
HiBy R3 II DAP 3.5mm
7Hz Artemis39 Bluetooth amplifier and DAC 3.5mm single ended

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ywheng89

100+ Head-Fier
7Hz Aero's Review - Good sound doesn't have to be expensive
Pros: Good note weight and tonality
Good bass performance
Easy to drive
Cons: Probably none at this price point
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General/Packaging/Build/Comfort
7Hz rose to fame with their release of Timeless, the legendary planar IEM that is still pretty much being discussed or brought up even to date. Aero, being their latest release in the budget segment, priced even lower than the Zero 2, of course, there’s always a catch, non detachable cable. Packaging wise, it is rather straightforward and minimal, nothing to shout out about, IEM and eartip, given the asking price, the exclusion of storage pouch can be overlooked. The cable although non detachable, is very soft and supple, but due to the PVC sheath, it is easy to get tangled, i do wish it has ear hook on the cable for once, build quality is alright and comfort is good as there are no weird protrusion on the shell that will affect comfort.

Gears used for this review

  • 7Hz Aero with stock eartips
  • Aune Yuki
  • 7Hz Artemis39

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Foreword
My review is solely based on what I hear via my equipment and I never consider my reviews to be objective in any way rather a subjective approach. Do take into consideration that everyone’s ear anatomy is not the same, so the psychoacoustics perception might be different as well, but i believe it will not stray too far

Sound
The Aero sports a mild U shaped sound signature to my ears. Timbre is very natural overall and good note weight as well. At 14$, i am mind blown, of course it can’t be compared to a high end set, but at 14$, it's safe to say the sound doesn’t sound cheap at all.

Bass
  • The bass rendition is nowhere near basshead level but it certainly provides enough "fun"
  • Bass extension is good and the sub bass rumble can be felt, definitely no slouch when it comes to EDM
  • A little lacking in terms of texture, but it is also tight and clean
  • Mid bass has got thump to it and the transition between the sub and mid bass is quite balanced without sounding incoherent
  • I personally find the tuning of bass is done right to my preference,somewhere between fun and audiophile but not venturing into the basshead category
  • It has got the thump and rumble which is fun especially when I’m gaming with it or watching some TV shows
Mids
  • Timbre sounds correct to me and the midrange is neither too forward nor recessed
  • Vocal doesn’t sound recessed, both male and female vocal has good texture to them,doesn’t sound thin at all
  • Female vocal however does lack a bit of energy due to the slightly subdued upper mids
  • Bass does not bleed into the mids
  • In general,i find that the mids are smooth from the lower mids to upper mids
Treble
  • The treble is smooth, it has enough energy but not to the point where it is harsh and sibilant
  • Detail retrieval is quite good for the asking price, can’t really fault it

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Soundstage/Imaging
  • Aero’s soundstage sounds slightly out of head and quite open,but a little lacking in depth to give the perception of big soundstage,but overall it is quite good
  • Imaging and separation is good
Driveability
  • Aero is very easy to drive and it does sound decently loud even from weaker source like Apple’s Lightning Dongle
  • Switching over to Aune Yuki,with decent driving power,bass seems to tighten up a little and better control is exhibited, in a way, it is quite scalable with power as well as source, the synergy is quite good with this combo
Comparison (7Hz’s Zero)
  • Zero is also one of 7Hz’s budget series, the tuning is leaning towards neutral and slight bright
  • In terms of sound profile, the Zero has slightly thinner note weight to my ears, slightly lacking in terms of bass
  • Technicalities is the strong point of Zero, Aero is not a technical beast but doesn’t mean it is bad
  • Soundstage is slightly smaller on the Zero, feels rather 2D-ish
  • Imaging is better on Zero
  • Detachable cable vs Not detachable on the Aero

Final Thoughts
Having used the Aero throughout the week, it's safe to say this is another hit released from 7Hz. Sure, non detachable cable might deter some, but for those who just want to plug and play, the Aero is currently my top choice, this goes to show that good sound doesn’t have to be expensive.

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*The Aero is sent over by Linsoul for the purpose of this review. I thank them for the support and opportunity as always

Head over to the official store if you are interested in getting one, it is currently being priced at 13.19$ at the time of writing

7Hz Aero Linsoul - Non Affiliated

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mars chan

New Head-Fier
7HZ AERO review
Pros: .

- sound quality

- price

- subbass

- the tuning

- small size

- 5 star rating for the price
.
Cons: .

- The cable is not removable.
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The 7HZ AERO (15 USD) is a very well-tuned budget IEM that rivals my other much more expensive IEMs in terms of the musical enjoyment that I get from it.

I would like to thank Linsoul Audio for sending me the 7HZ AERO to review. Linsoul Audio is an online audio store that sells mouth-watering IEMs, especially those expensive ones, which I wish to buy someday.

7HZ is one of the most respected brands in the IEM market today. In my view, they were made popular by their budget IEM, the 7HZ Zero, which I have myself, due to its very good tuning at a very low price. The 7-Hz AERO is also a very well-tuned IEM; I'll touch on this later. I also noticed that 7HZ is not the kind of brand that releases IEMs at short intervals; their products stay relevant for longer than usual.

The packaging is very simple and appropriate for the price; it includes three pairs of eartips and the IEM itself, and the cable is non-removable.


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Sensitivity, drivability, and synergy:

The 7-Hz AERO is easy to drive, but it has below-average sensitivity, which means that you need to set the volume higher than usual to get the same loudness. In my actual use, I never ran out of volume adjustment to reach my desired loud volume levels.

I tried it in my various dongle DACs and DAPs, and I found no issues at all. I also found the 7HZ AERO to be a forgiving IEM that even my lesser-quality small dongle DACs sounded great paired with it.

For this review, I used the stock eartips.

Power Handing:

The 7HZ AERO has an average power handling capability in the below 30 dollar price range based on my experience. I can hear it strugle a little at very high volume levels, just like any other IEM would in this price range. This is totally forgivable, and if you only listen to moderately loud volumes, this becomes irrelevant, in my opinion.

Sound signature:

It sounds very natural and musically engaging.

From upper midbass to lower treble, it is extremely flat and even sounding. I don't hear any bump in the midrange that would induce nasality in some vocals; none of that is in here. The subbass and the upper treble are tastfully elevated, making the overall sound signature slightly U-shaped.

The AERO sounds very forgiving. I used it with various sources and many kinds of music that vary in recording quality, and the sound of the AERO remained very good and musical on all of them.

Technicalities:

It is clear at first listen that the 7HZ AERO has above-average soundstage size for the price, the sound landscape feels natural, and it has good height, width, and depth.

The imaging, instrument separation, details, and resolution are not the best, but for the price, they are very good. The AERO performs well enough in this section not to make me bothered. In fact, I think the lack of ultra-precise imaging and super-detailed, high-resolution sound made the 7Hz AERO sound very musical, pleasant, and forgiving.


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Bass:

The bass has an excellent subbass boost, making for an enveloping feel while listening. The bass sounds clean and not boomy, but slightly stuggles at a very high volume with music that has too much bass. For the price, the bass of the AERO is excellent.

Midrange:

The midrange is very clear and lush sounding; it is very neutral and flat in frequency response subjectively speaking; there are no bumps and peaks, making the sound very smooth and never shouty; I also didn't hear too much harmonic and non-linear distortion; there is no nasality or any coloration; I love it.

Treble:

The treble sounds very airy, a little relaxed and forgiving, and with a hint of upper treble boosting, the presentation is delicate, pleasing, and sweet. This kind of treble will never cause listener's fatigue, yet it has very good clarity, energy, and engagement.

Compared to TangZu Wan'er SE (21 USD):

The Wan'er SE is more neutral, while the AERO is slightly U-shaped in sound signature. Both are great-sounding budget sets; I love them both.

Compared to 7HZ Zero (20 USD):

The Zero is more neutral, while the AERO is slightly U-shaped in sound signature, but in my opinion, the AERO has better sound quality regardless of tuning. The Zero has been superseded by the new Zero 2, but I haven't heard it yet.

Compared to Moondrop Chu II (20 USD):

The Chu II sounds darker or less bright, with a smaller soundstage and slightly less imaging performance, but the Chu II is made of metal and has a removable cable.

Pros:

- sound quality
- price
- subbass
- the tuning
- small size
- 5 star rating for the price


Cons:

- The cable is not removable.



Conclusion:

The 7HZ AERO is impeccably tuned and a great-sounding set, and when I considered its price of 15 dollars, I'm blown away. And thus, I highly recommend it to all, even to people who have much more expensive sets, as you might like it more than some of your expensive sets, as I do.

Once again, thank you, Linsoul Audio, for giving me the opportunity to review this great-sounding little set.

Happy listening, cheers!

Non affiliated purchase link: https://www.linsoul.com/products/7hz-aero

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aftersound

New Head-Fier
Maturity since small
Pros: - lightweight and very comfortable
- proper smooth U shaped tonal
Cons: - non detachable
- feels like a toy
This iem is only $15 and they looks and feels like a cheap iem from a dollar store just in exception for the cable being really smooth and flexible not like cheapy stiff cable

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but they do fit really comfortably in my ears when being worn either over ear or straight down, but personally i like straight down more due to its lack of earguide

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now here’s the special part…

the tonality can be categorized as mild U shaped but a very well done one

proper deep bass with decent control and speed, maybe lack a bit in texture but overall an allrounder one

midrange take a half step back and a bit laidback yet very well balanced in note weight, just keep a hair of “vocal edge” giving a raise in upper mid - lower treble transition area, highlighting a bit of vocal and instruments clarity and bite

a very enjoyable one while never being sibilant nor shouty

treble is also decent, smooth and natural giving just enough sparkle but don’t expect extra clarity and airiness here…

so as an overall for $15 it’s sooo enjoyable both fit and sound, very properly tuned

easy recommendation if you’re fine with non detach cable and the build quality

here’s a non affiliated link for purchase
https://www.linsoul.com/products/7hz-aero
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suicideup

New Head-Fier
7Hz Aero Review!
Pros: Well-done, U-shaped sound signature!

Smooth, relatively clean sound character.

Rumbly, subbass-dominant bass response (subjective).

Open, clear mids.

Well-extended yet non-fatiguing treble.

Wide, spacious soundstage under 20 USD!

Average at best separation and layering under 20 USD.

Scales well with power!
Cons: Fit, comfort, and isolation are underwhelming (to my ears, at least).

Nearly non-existent accessories.

Non-detachable cable.

Questionable build quality. There are sets under 20USD that are better built than this, so the build on this one isn’t a valid excuse in my book. Also, they could’ve designed this to be worn straight down, but they chose not to, because they can.
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7Hz Aero Review!

Video review here

Good day! After 5 days of casual and critical listening, here’s my written review for the 7Hz Aero. Diamond in the rough!

Disclaimer:
  • I don’t read FR graphs. I only use my ears, as earphones should be used.
  • Linsoul sent this unit to me in an exchange for an honest, transparent review. Rest assured that this review will do its best to devoid from any bias/es as much as possible.
  • The following remarks and observations shall be made and owned only by me.
  • No monetary compensation is/was involved before, during, and after the period of creation of this review.
  • Your mileage may (and always, will) vary.
Burn-in time: 4-8 hours per day, 5 days.

Source/s used:
  • - Non-HiFi smartphone (Infinix Note 12 G96), PC.
  • - Tanchjim Space DAC
  • - Hidizs S9 Pro DAC
  • - Aiwa XP-V710C CD Player (12 sec. EASS)
  • - Sony Xperia X Compact
  • - Local Files via Foobar, YouTube Music, Deezer, and Qobuz with UAPP.
IEM/Earbud/Setup configuration: Stock large eartips, any form of EQ or MSEB off, 40-60% volume.

========================================================================
Sound signature:
  • Unlike 7Hz’s sets under 20USD, the 7Hz Aero exhibits a well-done, subbass-dominant U-shaped sound signature.
Lows:
  • Don’t get me wrong, this is still a non-basshead set, but the bass in this region is sub bass focused, relatively thick and speedy, given that you have a proper fit and isolation with this set.Texture and details are average and are more than acceptable for its asking price. This region also gets better the more power you feed it, but not up to the point that you pair this with an amp.
Mids:
  • The mids in general are open, mildly recessed and are nearly free from bleed. Some ears may find this a bit too thin to their liking, but those people who are accustomed to U-shaped sets before will appreciate how open and clean the mids on this set. Lower mids are not too thick and have a decent amount of texture to it. Upper mids are mildly elevated and have clarity and air to it, but lacks a bit of sparkle to my liking, just like its treble. There aren’t any sibilance or harshness I have experienced in this region, which is a green light for me to recommend this to everyone.
Treble:
  • Just like the aforementioned characteristic on the upper mids, the treble is well-extended, has decent air, but lacks a bit of sparkle to my liking. No abnormal sibilance or harshness are perceived. Detail retrieval is average and will be more than enough for everyone.

Soundstage, Imaging and Separation:
  • The soundstage is definitely one of the two things that can amaze a person in this set, along with its mids. The soundstage is really wide for its price, immersive, if you may, because it gives me the impression that it is wrapped around my head. Separation and layering is average and will suffer congestion on very busy passages. Imaging is accurate enough for me to be able to use it in FPS games confidently.

========================================================================
Other IEM Comparisons!

KZ Castor (Harman Edition)

  • The KZ Castor (Harman Edition) is a U-shaped sounding set that is midbass focused compared to the Aero. Mids are more or less the same, but the Castor Harman shows additional thickness and warmth when compared. The treble is mildly extended on the Castor, but not by much. Soundstage is wider on the Aero, while the rest are more or less the same.
7Hz Salnotes Zero
  • The Salnotes Zero is a V-shaped sounding set compared to the Aero. It definitely has more bass quantity compared to the Aero, but lacks control and neatness the Aero has. The mids are also better on the Aero as it is more open and clean when compared. Treble is more refined on the Aero due to Salnotes Zero’s instances of mild sibilance on the said region. Technical performance is more or less the same, except for the soundstage as the Aero is noticeably wider in that regard.

Moondrop CHU II
  • The Moondrop CHU II is a V-shaped sounding set that has a noticeably darker and rolled off treble. Its mids are also less open and less refined when compared to the Aero. Technical performance is more or less the same, except for the soundstage due to the Aero’s impressively expansive stage.

========================================================================
Pros:
  • Well-done, U-shaped sound signature!
  • Smooth, relatively clean sound character.
  • Rumbly, subbass-dominant bass response (subjective).
  • Open, clear mids.
  • Well-extended yet non-fatiguing treble.
  • Wide, spacious soundstage under 20 USD!
  • Average at best separation and layering under 20 USD.
  • Scales well with power!
Cons:
  • Fit, comfort, and isolation are underwhelming (to my ears, at least).
  • Nearly non-existent accessories.
  • Non-detachable cable.
  • Questionable build quality. There are sets under 20USD that are better built than this, so the build on this one isn’t a valid excuse in my book. Also, they could’ve designed this to be worn straight down, but they chose not to, because they can.
========================================================================
Verdict

The 7Hz Aero is one of the sets under 20 USD that has a really good thing going for it and that is its sound and its impressive timbre. However, sound quality is only a major part of the many things we seek when we purchase earphones that we will actually use. Its build quality and accessories are nearly non-existent for its asking price, followed by its cheap-feeling build quality. One can argue that I am being too harsh on this IEM, but in my book it isn’t an excuse for this IEM to exist under 20 USD because the company itself already made an IEM within this price range that has a very decent sound quality without sacrificing build quality and practicality. Despite all of these rants I said, there’s no denying that the 7Hz Aero is a very good sounding IEM for its asking price and is still recommendable to everyone, as long as you take extra care using this IEM and you have reasonably small ears. This can be better, 7Hz!

Pairing recommendations:
  • Source: The 7Hz Aero is easy to drive, but scales well with at least 2vrms of power.
  • Eartips: The eartips included are soft enough, but you may use your preferred eartips.

Thank you for reading!

Non-affiliated link here: https://www.linsoul.com/products/7hz-aero

Additional Photos Here:

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Zerstorer_GOhren

1000+ Head-Fier
7HZ AERO: Unexpectedly Well-tuned One
Pros: ● The shell design is rather interesting as it has teardrop contours in a very compact size.
● Its design choice is surprisingly pretty ergonomic and it offers an excellent fit.
● A well-done coloured sounding set as it has a warmish-balanced tuning.
● An analogue sound lover's delight on how the sonic qualities of this set conveys.
● Well-balanced bass response with ample punch and rumbling sub bass response.
● Warm and well-textured midrange with an almost natural sound on vocals and instruments on their tonal colour.
● Smooth and inoffensive treble response.
● An above-average to wide sound/speaker stage projection.
Cons: ● Non-detachable cable
● Spartan inclusions
● Needs more power output to sound more dynamic and fuller.
● Not for neutral heads and analytical types of listeners.
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7Hz appears to be diversifying its product line-up as they released a flagship midrange set a few months ago and it received mostly positive feedback on that one on how it performs tonally with premium-grade inclusions with it as some high midrange sets do not have those contents with that kind of quality. And now they release a budget-friendly IEM for budget-conscious audio enthusiasts.

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This is a 7Hz AERO and it is a single driver set-up IEM earphone. It was equipped with a dual-chambered N52-grade neodymium magnet along with a metal wafer diaphragm on its 9.2mm dynamic driver for less distortion, better resolution and delivers a full range sound. Then the driver was encased in a rounded shell chassis made of polycarbonate plastic in which it has a decent build quality in my opinion although its cable is fixed rather than opting for interchangeability.

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The cable seems to be a decent one with a PVC insulating coating on its copper wire strands with a standard gold-plated 3.5mm single end on its termination plug. It is quite flexible and I didn't encounter any microphonic issues at all.

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Regarding its wearability, the 7Hz AERO with its rounded teardrop-shaped design, offers an ergonomic fitting for almost ear sizes as it also seals well into my lugholes without any discomfort. It gives a passable isolation from unwanted noises from the outside surroundings.

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The product packaging of this one is rather elementary in its presentation with just the essential contents inside, the IEM earphone itself and some extra silicone ear tips in different standard sizes.

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This set is a bit tough to drive as normal gain mode on some devices in a medium volume level won't deliver that fullness and dynamic sound on this one. You need a dongle with a better than usual power output or if you have a DAP with two or three stages of gain mode, medium or high gain mode would be sufficient enough on this one.

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As for tonality, the 7Hz AERO has a U-shaped sound signature with a warmish-balanced tonality that makes it more pleasurable on listening sessions for both casual listeners and experienced audio hobbyists.

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(FR graph was provided by @baskingshark , credits to him)

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LOWS/BASS:

The bass sections are fairly well-balanced on presenting the sub bass part and mid bass section as it delivers a rumbly, incisive and striking bass response while trying to keep under control any chances of mid bass smudging across other frequencies.

As the sub bass presence are clearly perceived its reverberating and rumbling nature that are produced by certain instruments like drum machines, synthesisers and low tuned bass guitars, its mid bass have an adequate texture to have some firmer note weight on certain instruments like bass guitars, double bass and bass kick drums, and also low octave male vocals like bass and bass-baritones. Bass guitars have a resonant sound, double basses have a sombre sound and bass kick drums have a sufficient fullness on its sound. Bass and bass-baritone vocals have a fairly deep resonant and reverberating voice with ample volume and darker tone.


MIDRANGE:

While it appears that it has tad notched midrange presentation on its overall sonic frequency spectrum, it has a proper warm to give a balanced note weight with a hint of energy to give off some translucency on its midrange tonality. Vocals of any type have an ample richness, fullness and clarity on their general sound characteristics while instruments have a well-nigh natural timbre of any kind.

When it comes to male vocals, baritones have smooth and warm voices, tenors have some graceful, ringing and brassy sound on their vocals and countertenors have sweet and tender on their light and agile voices. As for female vocals, contraltos have some rich and smoky sound from their usual chesty vocals while mezzo-sopranos have some fiery yet velvety on their versatile vocal range. Sopranos seems more silky and creamy with some added sheen to make it more cantabile and euphonic.

On instruments, strings like guitars, cellos and violin, they sound warm, lustrous and sensuous respectively while on brasses, trumpets sound full, trombones have these full and solid sound on them and horns sound ponder and tempestuous. As for woodwinds, concert flutes have a mellow and rich sound, piccolos have a clear sound, clarinets have throaty sound and saxophones have a round and warm sound. On percussion instruments, snares have hard and rustling sound, tom-toms have warm and sonorous sound, field drums have full and clear sound and kettledrums have resonant and booming sound. Pianos sound pretty balanced with rich and clear tones on them.


HIGHS/TREBLE:

The treble response of this one is relatively balanced and smooth but its airy extension is rather meagre in my opinion. There is a slight elevation on the upper-mids and presence parts just enough to give some definition and clarity on vocals and attack of percussives and rhythmic instruments. And I can assure that not a hint of sibilance nor harshness that I've encountered on this one that treble-sensitive folks will enjoy its tuning.

As I mentioned a while ago, it doesn't have an airy treble presentation and is also less sparkly. Cymbals have a lustrous sound while hi-hats have that short buzzing sound which sounds quite correct. Glockenspiels have a bell-like sound on them and the celestas have a mellow and velvety sound.


SOUNDSTAGE, IMAGING AND OTHER TECHNICALITIES:

To be honest, I don't really expect some good technical capabilities in this one but to my amazement, it unexpectedly executes pretty well. This set is able to project an above-average sound/speaker stage with a moderate width on its lateral span along with good height reach and depth of its sound field.

It projects a concave-like presentation of its stereo imaging where I was able to locate the placement of instruments and vocals in a not-so layered soundscape with just enough separation on it. Playing complex multi-instrumental tracks isn't that highly recommended on this set as I noticed some congestion and smearing of instruments on its playback.

Coherency is quite good as it is capable of delivering a nimble transient response without any issues like distortion or disjointed sound. On resolution capability, it has a solid macro-dynamics with acceptable micro-detail retrieval capability for a single DD set.


PEER COMPARISONS:

KZ EDCX

  • It has a modified UIEM-type shell design.
  • Also has a non-detachable cable with an L-shaped 3.5mm single-ended termination plug.
  • It also has a similar U-shaped sound profile with a balanced-warmish tonality.
  • It has also a punchy bass response although the bass bleeding appears more prevalent on this one.
  • It shares similar warmth and textured midrange as it delivers a natural sound.
  • The treble response appears to be smooth and balanced just like the AERO but I noticed that it even has a lack of sparkle and air on it.
  • It has a narrower sound/speaker stage size especially on lateral span width.

KZ LINGLONG
  • It also has a fixed cable on its cylindrical-shaped transducers.
  • It uses a smaller dynamic driver.
  • It is quite pretty-well accessorised.
  • It shares similar tonality and sound signature with AERO as it also has a balanced-warmish and also follows a U-shaped sound profile.
  • Punchy and well-balanced bass response.
  • Less warmer and a tad more recessed midrange presentation with less energetic female vocals and string instruments.
  • Almost similar treble response as it also has a smooth yet less airy and sparkly one.
  • On technical capabilities, it has a narrower sound/speaker stage and its stereo imaging appears to be more of a two-dimensional.

TANGZU PRINCESS CHANGLE
  • Another set with a non-detachable in a cylindrical shell form but it has a more ornate design.
  • Uses a smaller dynamic driver technology.
  • Fully accessorised for a budget-level set.
  • Like all the previous sets that were also compared with AERO, it also has a U-shaped balanced-warmish sound profile albeit it is a little bit leaner.
  • Punchy and rumbly bass response but I noticed that it has less textured mid bass.
  • While it has a sufficient warmth on its midrange, it appears that some instruments sound a bit hollowed.
  • It also shares similar treble response with AERO as it also has sounds smooth, balanced and inoffensive.
  • Compared to the AERO, It performs less impressively as it has a narrower soundstage and a two-dimensional stereo imaging.


As I concluded my review on this product, this is one of the few entry-level sets that impresses me in terms of tonal performance on how it delivers a sense of natural and analogue-ish type of tuning. While a non-detachable cable will be my main complaint on this one given that there are some ultra budget level sets that have those features along with too meagre of inclusions and a bit power demanding, those minor quibbles will somehow be outweighed with its sheer tonal balanced tuning which is the main selling point of this one that I actually prefer this one over that overhype entry-level set from the last quarter on the previous decade which supposedly an excellent sounding one.

And I hope that 7Hz will release a better version of this one later.


7HZ AERO is now available at LINSOUL, checkout the unaffiliated link below that I've provided.

LINK: https://www.linsoul.com/products/7hz-aero

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SPECIFICATION:

MODEL
: 7HZ AERO
IMPEDANCE: 27Ω
SENSITIVITY: 104dB
FREQUENCY RESPONSE: 5Hz - 20KHz
CABLE LENGTH: 1.2m
PIN TYPE: NON-DETACHABLE
PLUG TYPE: 3.5mm
DRIVER UNIT(S): (1) DYNAMIC DRIVER


TESTING TRACKS: ( * = 16-bit FLAC, ** = 24-bit FLAC, *'* = MQA, '*' = DSD, *'= .WAV)

Alison Krauss -When You Say Nothing At All *
Jade Wiedlin - Blue Kiss**
Led Zeppelin - When The Levee Breaks **
Mountain - Mississippi Queen *
Queen - Killer Queen **
Guns N' Roses - Patience *'*
Eric Clapton - Tears in Heaven '*'
Sergio Mendes- Never Gonna Let You Go '*'
Pearl Jam - Daughter **
Roselia - Hidamari Rhodonite *
Assassin - Fight (To Stop The Tyranny)*
Celtic Frost- Visual Aggression *
New Order - Blue Monday *
The Corrs- What Can I do (unplugged version) *
Jimi Hendrix Experience - Voodoo Child *
The Madness- Buggy Trousers *
Metallica - Motorbreath **
Mariah Carey- Always Be My Baby *
Destiny's Child - Say My Name *
Malice Mizer- Au Revoir *
Mozart - Lacrimosa *
New York Philharmonic Orchestra - Dvorak- Symphony 9 " From the New World." *
Eva Cassidy - Fields of Gold (Sting cover)*
Michael Jackson - Give In To Me *
Exciter - Violence and Force *
Diana Krall - Stop This World **
Debbie Gibson - Foolish Beat *'*
The Sisters of Mercy – Lucretia My Reflection**
Suzanne Vega – Luka **
Lauren Christy – Steep *
Ottoman Mehter - Hucum Marsi *
Diana Damrau - Mozart: Die Zauberflöte*


P.S.

I am not affiliated to 7HZ nor receive monetary incentives and financial gains as they provide me a review unit for an exchange of factual and sincere feedback from yours truly.

Once again, I would like to send my gratitude to MS. KAREENA TANG of LINSOUL for providing this review unit. I truly appreciate their generosity and trust towards me and other reviewers.


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Ianbanz

New Head-Fier
7hz AERO: The wolf in a sheep's clothing
Pros: 1. Incredible Value: At just $14.99 USD, the Aero offers an impressive sound quality that punches way above its price.
2. Sound Quality: The U-shaped tuning delivers strong sub-bass, clear mids, and a good treble, making for a balanced and enjoyable
listening experience.
3. Natural Timbre: Vocals and acoustic instruments sound lifelike, which is rare for budget earphones.
4. Soundstage: The expansive soundstage provides a sense of space and immersion, enhancing the overall listening experience.
Cons: 1. Non-Detachable Cable: The fixed cable might be a drawback for those who prefer the flexibility of replacing or upgrading cables.
2. Cable Design: The cable requires manual separation of the left and right sides, which might feel inconvenient and reminiscent of cheaper earbud designs.
When it comes to finding a good pair of earphones, the market is saturated with options that range from the very cheap to the extravagantly expensive. It can be tough to find something that hits the sweet spot. Linsoul sent me the 7hz Aero for review and by the looks of it and to be honest my expectations are low, imagine the surprise i have when i first tried the Aero for such a small iem it has an insanely big sound. if you equate quality and affordability with a sound that really punches way above its ultra budget price at a mere $14.99 USD. At this price, you might expect a compromise in sound or build quality but 7Hz has managed to create a product that not only meets expectations but exceeds them and i was honestly blown away at the big montrous sound this tiny iem produces, these earphones are equipped with a 9.2 mm dual-chamber dynamic driver with a metal diaphragm, with a frequency response of 5 Hz to 20 kHz. On paper, these specs suggest a potential for decent performance, especially considering the ultra-budget category they belong to. But do these numbers translate into real-world value? Let's delve deeper.

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Accessories

When you unbox the 7Hz Aero (unboxing video below please click and subscribe) you're greeted with a minimalist package. Aside from the IEMs themselves, you get three pairs of silicone eartips in small, medium, and large sizes, i was expecting the usual colored rubber tips usually 7hz include in other models. While this isn't an extensive array of accessories, it is quite standard for the price range. It’s enough to get you started without overwhelming you with extras that might push up the cost unnecessarily.

Design and Build

The Aero comes with a non-detachable cable ending in a 3.5 mm jack. While some might see this as a drawback, given the rising popularity of detachable cables for easy replacement and potential upgrades, it’s an understandable choice to keep the price low. The cable they use reminds me of those cable commonly use in budget earbuds like the ve monks, and when first using the aero you actually have to split the cable to separate the left and right side.

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Bass:
The Aero is tuned to a U-shaped signature, with a strong emphasis on sub-bass. It delivers a very respectable rumble that goes low and deep, which is quite impressive. The mid-bass is quick and clean, with minimal bleed into the mids. While the texturing might be average, it’s a small gripe given the price point. Bassheads might find it a tad restrained, but for general listeners, it strikes a very good balance of musicality and analytical.

Midrange:
The midrange sees a slight dip, which is typical of a U-shaped signature. This tuning keeps the mids clean and free from bass interference or bleed. Vocals and instruments in this range come across clearly, albeit slightly recessed. The upper mids provide a pleasant forwardness without becoming shouty, making vocals sound natural and engaging with a very natural texture and smoothness.

Treble:
Treble extension is good but not exceptional. It doesn’t sparkle as much as higher-end models, but it manages to avoid sibilance, which can be a deal-breaker for many. The resolution is surprisingly good for a $15 earphone, giving enough detail to keep the listening experience engaging.


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Timbre:
One of the standout features of the Aero is its natural timbre. Thanks to its single dynamic driver, vocals and acoustic instruments sound lifelike, a feat that many budget earphones struggle to achieve.

Technical Performance
In terms of technicalities, the Aero holds its own against similarly or even higher priced competitors. The soundstage is impressively expansive even cavernous, offering a very good sense of space, depth and dimension. This wide soundstage enhances the listening experience, making it feel more immersive. Micro-detailing is decent, allowing you to pick up on subtle details in the music.

However, the Aero does have its limitations. With complex tracks, instrument separation can become muddled, and the overall resolution falls short compared to higher-end models. Yet, for its price, these shortcomings are more than forgivable.


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Conclusion
The 7Hz Aero is a remarkable offering in the ultra-budget category. It delivers a well-balanced U-shaped sound signature that is likely to please a wide range of listeners. While it does have its limitations in terms of technical performance and build features like a non-detachable cable, the overall sound quality and natural timbre make it a standout choice for those looking for an affordable pair of IEMs.

For $14.99, the Aero doesn’t just meet expectations—it exceeds them. Whether you’re a casual listener or a budget-conscious audiophile, the 7Hz Aero is worth considering for its excellent value and surprisingly good performance, the 7hz Aero is a real Wolf in a Sheeps clothing. dont let the size and the budget size fool you, this is a gem of an iem that is very rare in a very saturated iem market today.




Linsoul : https://www.linsoul.com/products/7hz-aero
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baskingshark

Headphoneus Supremus
Pros: Excellent price-to-performance ratio
Light and ergonomic
Balanced U-shaped tonality
Relatively speedy bass without much bleed
Transparent midrange
Sibilant-resistant treble, yet retaining some resolution
Big soundstage and acceptable imaging that belies its modest price
Natural timbre
Cons: Non-detachable cable
Spartan accessories
Below average isolation
Easy to drive from weaker sources, but benefits from amplification headroom
DISCLAIMER

I would like to thank Linsoul for providing this review unit.

The 7Hz Aero can be gotten here: https://www.linsoul.com/products/7hz-aero (no affiliate links).

Aero 4.jpg




SPECIFICATIONS
  • Driver configuration: 9.2 mm dynamic driver
  • Frequency response: 5 Hz - 20 kHz
  • Impedance: 27 Ω
  • Sensitivity: 104 dB/V
  • Cable: non-detachable; 3.5 mm. No information on cable materials
  • Tested at: $14.99 USD

ACCESSORIES

Other than the IEM, these are included:
- 3 pairs of silicone eartips (S/M/L)


Aero 6.jpg


Considering the Aero comes in at just below 15 bucks, it is no surprise to see only eartips furnished in the packaging. This area was probably cut to funnel all the cost savings into the sound, and I would definitely take a good-sounding IEM with minimal accessories over a generously-provided for set with crappy sound. Nevertheless, the 3 pairs of silicone tips included here are serviceable.


Aero 7.jpg


We have no information on the Aero's cable materials, but it is a non-detachable one, which is a not uncommon occurrence in the ultra-budget segment; there are actually pricier models in this day and age that still come with non-detachable cables. This cable is on the thin and tangly side, but thankfully we have controlled microphonics. There's a chin cinch for grip.

The rest of this review was done with the stock silicone tips. No aftermarket accessories were used, so as not to add any confounders to the sound.


BUILD/COMFORT

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The Aero comes in a unique circular design, with an angled nozzle. 7Hz's logo is emblazoned on the face-plate, with the rest of the housing fashioned from translucent plastic, allowing users to visualize the internals. When placing an order, one can select amongst a black, blue or red hued variant.

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The shells are light, weighing in at 2 g apiece. Despite a slightly longer nozzle, fit is quite ergonomic with decent comfort, and I could wear the Aero for long sessions without issues.

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Being a vented IEM, isolation is below average. However, this does contribute to an expansive soundstage, as we will read below, so it is a double-edged sword. The vents also assist in pressure relief, with no driver flex noted on my pair.


INTERNALS

The Aero packs a 9.2 mm dual-chamber DD; this utilizes a custom metal dome and N52 magnets, with an ultra-thin CCAW voice coil.


DRIVABILITY

I tested the Aero with the following sources:
- Apple dongle
- Cayin RU7
- Chord Mojo 2
- Fiio KA11 dongle
- Fiio KA17 dongle
- Khadas Tone Board -> Schiit Asgard 3 amp
- Onix Alpha XI1 dongle
- Questyle M15 DAC/AMP dongle
- Sony Walkman NW A-55 DAP (Walkman One WM1Z Plus v2 Mod)
- Sony Walkman NW A-55 DAP (Walkman One Neutral Mod)
- Sony Walkman NW WM1A DAP (Walkman One WM1Z Plus v2 Mod)
- Smartphone

While this IEM can be powered off a weaker device like a smartphone or an Apple dongle, it does require some headroom for volume, and will also scale with amplification in terms of dynamics and bass control.


SOUND & TECHNICALITIES

7Hz Aero.jpg

Graph of the 7Hz Aero via IEC711 coupler. The 8 kHz region is a coupler artefact peak.

Tonally, the Aero sports a well-tuned U-shaped signature with a sub-bass preponderance. This should be a bona-fide crowd-pleaser.

As described above, sub-bass is the focus. It descends to 20 Hz with a modest rumble. The Aero is not a basshead IEM by any means, with a mid-bass on the speedier side with minimal bass bleed. Texturing is average, but that is a nitpick since this IEM is literally as cheap as chips.

The lower midrange has a slight depression, in keeping with the U-shaped profile. This region is relatively pristine, not encroached upon by a bleeding mid-bass. The upper mids reach 8 dB in ear gain, which translates to forward vocals without overtly veering to shouty territory (unless you belong to the anti-pinna gang).

Treble has decent extension but isn't the most sparkly in the upper registers. Sibilance is minimal and resolution is not too bad for the $15 entrance fee.

The Aero has a natural timbre, in keeping with its single DD roots. Vocals and acoustic instruments are life-like with no complaints on my end.

We can't ask for the moon for its economical price tag when it comes to technicalities, and the Aero isn't as resolving as more expensive single DDs. But when pegged against other ultra-budget single DDs, the Aero fares well in technicalities. It has a huge soundstage beyond the ears - with good spread in all 3 dimensions - something not found in similarly priced rivals, and micro-detailing can beat other ultra-budget pairs. Imaging is more than acceptable. However, music may smear in instrument separation with very complex tracks, but that's to be expected for ultra-budget gear.


COMPARISONS

The Aero will be compared against other $20ish single DDs. Hybrids, multi-BAs, and planars, which have their own pros and cons, are left out of the comparisons.

BLON BL-03

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Graph of the 7Hz Aero versus BLON BL-03 via IEC711 coupler. The 8 kHz is a coupler artefact peak.

The legendary BLON BL-03 has a thicker note weight - with an enhanced mid-bass quantity - but is more placid in the upper frequencies and sounds darker overall. The BL-03 has a flabby bass that is less tight though.

The BL-03 loses to the Aero in soundstage, layering and micro-detailing, and doesn't have as a well extended treble.

The BL-03 has a detachable cable, but has one of the worst ergonomics in the industry cause of a super short nozzle.


Final E500

Aero versus Final E500.jpg

Graph of the 7Hz Aero versus Final E500 via IEC711 coupler. The 8 kHz is a coupler artefact peak.

The E500 is a warm neutral IEM, and also has a non-detachable cable. However, the E500's one is noodle-thin, without strain-relief, and it also has annoying microphonics.

The E500 comes better accessorized, with a full set of the highly-sought after Final E black tips included inside the packaging. The E500 is another IEM that benefits from amplification, due to its lowish 98 dB/mW sensitivity.

The E500 is thicker in note weight (especially in the midrange), but it has a darker treble and less sub-bass. The E500 is more relaxing and laid-back, but is a step behind in soundstage and micro-detailing. Imaging is similar.


Tangzu Wan'er

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Graph of the 7Hz Aero versus Tangzu Wan'er via IEC711 coupler. The 8 kHz is a coupler artefact peak.

The Wan'er is a warm neutral set. It has a detachable cable and is easier to drive.

The Wan'er is however, weaker in soundstage, imaging, micro-detailing and instrument separation.


CONCLUSIONS

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For the price of a restaurant meal, the 7Hz Aero is a well-tuned beast, with top-notch price-to-performance ratio. Other than bass texturing, most of my complaints actually have to do with external non-sonic aspects, such as the non-detachable cable, dearth of accessories, below average isolation and perhaps the scalability with amping. These bugbears are fastidious nitpicking on my part, as this IEM is at the end of the day, a sub-$15 one.

With the negatives out of the way, the Aero melds the 3 Ts of timbre, tonality and technicalities nicely in an affordable package. We hear a balanced U-shaped crowd-pleasing tone, with imaging and soundstage a highlight. Of note, it easily beats the legendary BLON BL-03 in technicalities.

Timbre is natural and the bass is speedy without much bleed, coupled with a transparent midrange. The treble is quite resolving for the coin, and it doesn't overstay its welcome in terms of sibilance.

The value proposition of this IEM is sky-high, and diminishing returns can only hit hard moving on from here. In my book, the Aero joins luminaries as a new gatekeeper single DD of the ultra-budget realm, with the proviso being if you can stomach the non-detachable cable.

Folks who have amassed a drawer full of higher-end gear will probably have heard something more resolving, but the Aero can nevertheless be an inexpensive daily beater every day carry, which won't result in heartache if it is lost or damaged. The Aero is going to be one of my go-to recommendations for new ones to the hobby, or even to collect as a stocking-filler for Christmas.
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bramkaandorp
I'm confused by the mention of an interchangeable cable in 7Hz's marketing material. Why would they say that, if it isn't true (and I don't doubt you when say that it isn't swappable).
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bramkaandorp
Even stranger is that any mention of an interchangeable cable has been removed from sites that sell it.
baskingshark
baskingshark
@bramkaandorp the cable is not detachable, I can confirm that. Not sure about marketing materials, but probably those were erroneous and have been removed.
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