Sendiy Audio M1221

General Information

Cable over ear, light weight metal IEMs with interchangeable sound filters from Sendiy Audio

Latest reviews

minhmap859

New Head-Fier
Pros: Balanced sound signature that plays nice with almost every genre.
Easy to drive.
2 cables.
Lots of accessories.
Nice build quality, good fit with almost every kind of ears.
Good Customer service
Tuning filters that aren't totally gimmick.
Cons: Source dependent and tip dependent.
Never truly shine with any genre.
Price now is rather high.
No cable with microphone.
So, Sendiy. Just another new face in the oversaturated playfield that is the China IEM scene: with their arrival in early 2016 come the budget-sensitive Sendiy M2 as their not-so-grand entrance to the cutthroat world of cheap IEM from China, it doesn’t surprise me when Sendiy rushes to introduce its flagship later that year: the sendiy M1221, a full metal hybrid IEM with 1 DD and 1 BA that every one rave about and no one ever buy.

…Well, not until today, when they have raised the price to 200$ and included a much, much fancier packaging, indeed.

Still, let’s take a closer look at the Sendiy M1221 and see for yourself whether or not it is worth buying or it is just another byproducts of the Head fi hype train, ‘kay?

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DISCLAIMER: Oi, please take everything I said below with a grain of salt, lads: everyone’s ears, taste and preference are different, and what I said below is what I honestly and subjectively feel about the product. Don’t take it as gospel or anything, okay?
Just FYI, I bought this one 5 months ago with my own money, and I do believe that they have been burned long enough that their sound signature won't change anytime soon and I have been long passed the honey moon period: no new toy bias for me, or so I hope.

Specifications

Drvier 1x Dynamic + 1 BA
Impedance 20 Ω
Cable 1.2 m, 6 core silver plated copper
Sensitivity 110±5dB

Packaging and accessories: For the one with the newer packaging? Nice. Nice as ****. Very v-moda-y, if you know what I mean. Much box. Such fancy. Wow. Yadda-yadda. Back in the day, the unboxing process was pretty simple for us old timer: Open the heavily cushioned postage packaging and try and failing to open the hard case and losing one or two finger tip in the process and…I mean, you get the picture: All we ever got is the hard case. I mean, yeah, it IS a very nice hard case, but…you know, there is nothing to unbox to begin with.

Right out of my head, these are what I remembered packaged inside the hard case:

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  • A pair of M1221 earphones (Duh)
  • 1 detachable silver coated cable with MMCX connectors
  • 3 pairs of tuning filters (silver, gray and black in 6mm: the 8mm variations is only available for later edition)
  • A pairs of foam tips
  • 3 pairs (S, M, L) double flange silicone tips
  • 3 pairs (S, M, L) single flange silicone tips
  • shirt clip

If you check mine with the later one, you would find mine lacking the longer tuning filters and the semi-hard smaller carrying case, both of which would be very welcomed to have: Still, I do have the longer tuning filters now, thanks to a series of incidents that I will describe later…

Build, comfort and isolation:

Now, controversy about having the same design as the magaosi K1 and the trinity Atlas aside, it is no doubt that the Sendiy M1221 has a pretty good build: constructed from a precision engineered aluminum ergonomic shell that rivals RHA audio in terms of durability and style, its futuristic design features a nano-coated technology to ensure that moisture cannot break into and corrode the internal drivers. Still, while it is rather light, it is by no mean fragile and has indeed survived a lot of close calls that can absolutely break more delicate IEM: dunked into water? No problemo. Dragged through sands? No big deal. Chewed and spit out by a dog? Nah, still work. Get stepped on? Careful, you might hurt your foot there. Aside from being built like a tank, It is also sleek, rounded and without any edge, just like how it sounds. For the cables, they are all well-built: the newer cable, while definitely isn’t worth the 90$ price tag, is a remarkably well-designed and a joy to look at and listen to, having no noticeable microphonic to my ears. Still, while it is quite hard, the venting port near the MMCX connectors can be blocked, and so you should try to not block ‘em by accident.

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Still, it isn’t like Sendiy can escape the horrible reputation of China manufacturer and their almost legendary lack of quality control : well-crafted as they might be, there was a problem with my black filters when one of them just slide right off no matter how I try to keep them in place: thankfully, Sendiy was very responsive and helpful to my woe and offered to sent me the new cable along with a new pair of black filter too, which…well, I was rather keen of. Still, unfortunately, my pair developed some kink along the way no thanks to my abusive way of using IEM and the left one got a little bit quieter…So I had to send it back to Sendiy for maintenance, which thankfully was a rather uneventful process. Still, it is good that there is no third party to mess stuff up because there is only 1 channel for buying Sendiy’s products and as long as you are cool with sending your iem back to China for repairing, the gens at Sendiy would probably fix yours up, no question asked, no finger pointed, free of charge, which is much more than expected for a China-based IEM company: Massive prop for the great customer service, Sendiy.

Well, for Isolation, I do think that they are kind of…well, average for IEM this type: depend on the filter and the tips that isolation will change, though, with silver filter offer greater than average isolation while black filter offers the least and the gray filter is something in between. Insertion is on the shallow side of things, and deep insertion can feel a little awkward.

Sound: Indeed, the part everyone is waiting for! ‘Ere we go!


Source used for testing:

Xduuo X3 => Fiio e17K

Zishan z1

Zishan z1 => Fiio e17k

PC => Fiio e17k => O2 amp

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Personally, this review is created while I was listening through my Pc with the last setup, and I have found that in general, while phone and such can definitely power the sendiy M1221, you do need a low impedance source for the M1221 to sounds at its best: a wee bit of amping doesn’t hurt, too.


Tuning filters:

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There are three filters which are described as thus:

Silver (bass boost): Most isolation, largest amount of bass, smallest soundstage. A tamed L-sound signature to my ears. Not quite basshead material, but close enough.

Gray (reference): Average on all fronts. Classic V shape, a wee bit light on male vocal but still pretty good and realistic. My preference in general.

Black (high boost): Least isolation, almost no bass to speak of, largest soundstage. Offered greatest amount of detail. Airy.

Unlike other experiences with them, I have found the filters having quite a big effect to sound signature in general, and depend on whether or not you fully cover the small hole on the gray and black filters with your tips or not, the sound signature will change even further. As of what I said below, please assume that I am using the gray filters with…well, the monstrosity Frankenstein of a tip that I personally crafted for my ears.

Bass: Thanks to the dynamic driver, the sendiy M1221 can hit hard and hit fast: even with the silver filter on, I never found the bass bleeding into the mid or blending together into a mess of sounds: Subbass is very controlled for this price, and whatever the track ask for, M1221 delivers. Take Savant on Mushrooms by Infected Mushroom for example: the meaty yet delicate sub bass that only deliver upon being asked on is addictive by itself alone. For example of its control ability, just use any of your run of the mill bebop jazz or progressive metal, and I believe that you will be pleasantly surprised.

Mid: Personally, I think the mid on M1221 is..well, rather subdued when you pair it with the supplied, prepackaged tips. Only with this..eh, ‘custom’ tip that I get the mid response that I like: neutral, detailed and NOT thin, with the perky 4k Hertz response tamed. Still, in general, the mid of M1221 has good separation, speed and timbre, with a rather forgiving upper midrange and a more delicate lower mid that can make male’s voice sounds a little thin but still pretty realistic: in short, average for the price, but definitely the weakest link for the M1221. Thankfully, changing tip can turn thing for the better...or for worse. Just don't use spinfit, however, it will make the already thin midrange to sounds even thinner. No good.

Treble: Well extended yet never overbearing, it is rather good for long term listening, if I must say it. Definitely not dull, however, and the timbre is pretty realistic to my ears: not its strongest point there, and like the mid, it is rather average: not the most revealing there is nor the most forgiving one, it is just excitable enough to get the job done, and I like it for that.

General sound comment: Well, I found out the sendiy m1221 is very good at being an all-rounder, having no obvious weak point and 3 pairs of interchangeable filters to switch at will so to suit one genre better: Still, its timbre isn’t perfect, and its soundstage is…well, average. Imaging and resolution is rather good, no doubt thanks to the hybrid design. Still, aside from the well-controlled bass, its treble and mid isn’t anything to write home about, even though they are pretty detailed and coherent: I mean, that is what everyone expected coming from the 200$ price tag, y'know.

Conclusion:

Overall, I’m quiteee impressed with the M1221, especially with the build quality and customer service. I find them to be very enjoyable as a daily-listener, and I think that for the previous price 150$, they were quite a good choice. They won’t be the greatest bang of the buck you can get, that’s for sure, but they would be listenable in pretty much every kind of genre. However, at the current price of $200, they do have some stiff competition (e.g. LZ A4 and Pinnacle P1), and the M1221, sitting in between the LZ A4 and the P1 in sound signature, is not that bad a choice even though they cost 200$ now if what you look for in an IEM is a balanced, non-fatiguing and versatile sound signature and a design comfortable enough for long term listening.

All in all, 4/5. Can be improved, but alas, it is perfect…in its mediocrity.
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nadezhda 6004
Thanks for the review. There are two pairs of silver filtres. One pair is wider and longer. The second pair is shorter and narrower. Which pair is bassier?

crabdog

Headphoneus Supremus
Pros: Excellent build quality. Clear, balanced sound. Nice accessories.
Cons: Up against some stiff competition
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Yet another earphone manufacturer hailing from China, Sendiy came onto the scene in 2016 with their M2, a wooden IEM that came out of the gate with a lot of praise and recommendations. Things went awry shortly after when another seller released their own version which looked identical but was reported to be inferior sonically. Controversy aside, the people who got the genuine article seemed to be very pleased with it. Fast forward to late 2016 and Sendiy released a new flagship IEM, the M1221. It's a hybrid unit with a single Dynamic driver plus one balanced armature. Is it any good? Let's get on with the review then and hopefully by the end you'll be able to decide if this is one you'll want to add to your collection.

Specifications

Drvier 1x Dynamic + 1 BA
Impedance 20 Ω
Cable 1.2 m, 6 core silver plated copper
Sensitivity 110±5dB

Disclaimer

This sample was sent to me for the purpose of an honest review. I am not affiliated with the company and all observations and opinions here are my own, based on my experience with the product. Thanks to Sendiy for the opportunity.

The Sendiy M1221 is currently priced at $199 and is available from Sendiy's Aliexpress store: https://sendiyaudio.aliexpress.com/store/2229115

Packaging and accessories

The M1221 comes in a very nice, irregular hexagon shaped black box, complete with little pyramid shaped metal studs securing the carry strap and box clip. On the front is the Sendiy branding in glossy silver and the company's motto "Music changes life--enjoy it". On the back is a list of features and specifications along with a frequency response graph and a diagram of Sendiy's unique driver configuration (more on that later).

Inside the box is the provided carrying case which holds the earphones and all of the accessories. The case is a bit unusual compared to what we usually get with IEMs in that it's an IP68 graded water and dust proof affair (similar to Pelican cases) that has a waterproof depth of 33 meters and can withstand falls from heights up to 5 meters. It's a very nice case indeed, although it does require a bit of force to open and close. Sendiy was also considerate enough to provide an additional regular semi-hard case that's pocket and bag friendly.

Alright, let's take a look at the full list of accessories that come with the M1221:
  • M1221 earphone
  • x2 detachable silver coated cables with MMCX connectors
  • 6 pairs of tuning filters (silver, gray and black in 6mm and 8mm variations)
  • 2 pairs of foam tips
  • 3 pairs (S, M, L) double flange silicone tips
  • 3 pairs (S, M, L) single flange silicone tips
  • carrying case
  • shirt clip
As you can see there's fairly comprehensive list of accessories provided and should include everything you could want to get sorted. The only thing I would wish to see added is some larger ear-tips as every one of the 8 pairs were too small for my ears but to be fair that is the case with 4 out of every 5 earphones I get. Luckily I have a personal collection of extra large tips on standby so I was ready to go in no time.

Both of the provided cables are very nice but the upgraded braided one is my preference. It's braided with metal, color coded MMCX connectors and a heat shrunk plastic tubing that forms nicely over your ear. Microphonics are practically non-existent and it feels supple yet sturdy. There's a metal chin slider and Y-split with good strain relief. The cable terminates in a 90° 3.5 mm plug that is a nice mix of metal and translucent plastic.

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Build, comfort and isolation

These things are light, much lighter than you'd expect for a metal earphone but Sendiy has used an aerospace grade aluminum alloy that supposedly has 10 times the hardness and density of normal metal. Well I'm no metallurgist so I'm going to take their word for it. I can tell you however that the housings feel incredibly strong and the build quality is just superb. The CNC carved housings feel great in your hand and everything is aligned perfectly. You can barely feel the seam where the two halves are connected. All the surface is smooth and rounded with not a sharp or straight edge to be seen, or more importantly felt when in your ears.

On the outer sides of the housings is the Sendiy branding in a concave recess that runs from front to back. There aren't really any other features worth mentioning except for the minuscule port that's just under the front end of the MMCX connector. My description probably hasn't done the build justice. I believe you'd have to feel them in your hand and take a real close look to get a grasp of how well these are constructed as pictures just don't do them justice.

The tuning filters are also expertly crafted with a series of notched rings on the surface, similar to a crown on a wristwatch. These make the filters very easy to grip and turn when inserting or removing them and they also have the added benefit of letting you choose whether to have the ear-tips slightly extended from or flush with the end of the nozzle as they sort of "click" into place for each position. The threading is smooth and precise and it's super easy to change filters.

For this writer's ears the M1221 are extremely comfortable because of their light weight, smooth, rounded edges and diminutive size. The two different filter lengths are a nice touch and for me I found the longer ones to give the best fit. I could easily wear these all day long without a problem.

Isolation is about average for this type of IEM, meaning pretty good so long as you're getting a proper seal and they're great for blocking out external noise.

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Sound

Sources used for testing

  • Benjie X1
  • Acoustic Research M20
  • Samsung Galaxy Note 5
  • PC/MusicBee > Sabaj D3 DAC
Tuning filters

There are three filters which are described as thus:

Silver (bass boost)

Gray (reference)

Black (high boost)

The filters have a fairly subtle effect, mainly making slight adjustments to the amount of bass. They work as expected from the descriptions, with the gray filters giving the most balanced presentation. I've been listening to a lot of EDM and ambient music lately so have mostly stuck with the silver filters for a little extra body and that's what I'll be basing evaluation on.

Bass is very controlled with good impact and excellent separation from the midrange. Even with the silver filters it remains reasonably tame but there's enough impact for EDM, hip-hop and other bass driven tracks. It won't be enough to satisfy the extreme bassheads out there but for most it should be more than ample. It's pretty fast regardless of filter choice and has that solid presence that dynamic drivers bring. Sub-bass can be a lot of fun with the M1221. The undulating sub-bass swoops in Connect Ohm's "Snow Park" (again with silver filters) and the thick, heavy kick drums is a pretty intoxicating experience bringing some skull penetrating vibrations without any signs of distortion. Overall the bass aspect of this IEM is, in my opinion one of the highlights.

Mids are delightfully clear and resolving and remain free of the influence of the bass notes. There's plenty of detail to be found here as well with good separation and space between elements. Female vocals are nice and smooth without sounding recessed or thin and the upper midrange is graciously forgiving. Even Utada Hikaru's "Traveling" can be listened to at moderate to loud volume without discomfort with its inherent sibilance and bright notes. It's also a good song to test the mids as it's a very busy song with a lot going on and can become congested and lose details on lesser IEMs but that's not an issue here. Male vocals are slightly thinner but sound natural and are not overshadowed by upper midrange instruments.

The treble is well extended but never strident, though it isn't the most exciting aspect of the sound. There's not a great sense of airiness but there's definitely enough presence to lift the sound and keep its balance with the mids and bass. It's one of those trebles that doesn't become fatiguing at higher volumes so if the mood takes you there's no harm in turning things up. There's slightly more treble than the TFZ Balance 2M but less than the LZ A4 (depending on filters). For the most part I like the treble here but at times it can be a little stale.

Soundstage is neither overly large or small but gives more of a sense of width than any depth. Compared to the LZ A4 it is a bit confined and while it's far from disappointing it's fairly ordinary. At other times though, like in "When I Fear You, All Else is Where it Should be" by iiah it opens up considerably and renders the haunting track wonderfully.

Comparisons

vs LZ A4 ($195 USD)


While the M1221 does have various filters it can't come close to the customization possible with the A4's double filter system. Despite the more balanced presentation of the Sendiy I find the A4 to reproduce more micro details, even though it has a more colored sound. With the silver filters the M1221 has more bass presence than the A4 with black rear filters and overall the Sendiy is a little more forward in the midrange. Comfort of the Sendiy is superior to the LZ because the housings are much smaller, though the A4 gives you the option of wearing over ear or with cable down.

vs TFZ Balance 2M ($199 USD)

TFZ's B2M has an L-shaped signature with a weighty low end and has more bass than the M1221 even when using the silver filters. The Sendiy is a little more revealing which is usually expected with hybrids but still comes across as smooth, however the B2M has a rich organic feel with a silky, intoxicating midrange. Those who prefer a more balanced approach will appreciate the M1221 but for bass lovers the B2M is the way to go. Both have great build quality and accessories but the M1221 pulls slightly ahead in terms of comfort due to its much lighter weight and smaller shells.

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From left to right: Sendiy Audio M1221, LZ A4, TFZ Balance 2M

Conclusion

Meticulously crafted the Sendiy M1221 brings a well balanced, clear and engaging sound. The accessories bundle should please most people and the IP68 graded storage case is a nice addition, particularly if you're planning to go anywhere near water with your IEM.

There are some excellent contenders available in this bracket, including the A4 and Balance 2M (in the comparisons above) but the M1221 can definitely hold it's own with those and would be a solid choice if you're looking for something more balanced and fairly linear. I think Sendiy has done a great job with this earphone and they are on track to be a very strong player going into the future. If you're looking for something in this price range the Sendiy M1221 should not be overlooked.

4.5/5 stars

slowpickr

Headphoneus Supremus
Pros: Detachable Cables (quantity 2)
Accessories
Build Quality
Non-fatiguing Sound
Comfortable to Wear
Light Weight
Sound Tuning Options (i.e. filters)
Long and Short Filters
High Quality Packaging and Presentation
Cons: Opening the plastic case and detaching the MMCX cables can be dangerous
Cable over ear only
Cost
May be hard to find tips that work well
A filter holder/container would be nice (e.g. Trinity)
A cable with a mic is expected these days
Introduction/Disclaimer:

I would like to thank Sendiy Audio for the opportunity to review the M1221 in ear monitor headphones. They provided me a free sample in exchange for my honest opinion. The current price for these excellent IEMs on Aliexpress is approximately $199 USD. Here is a link to purchase:

Sendiy M1221 Aliexpress

IIRC, the price a few weeks ago was around $150. I believe the recent price increase is due to the addition of an upgraded audiophile cable mentioned about half way down the web page. The above Aliexpress link has some excellent pictures of the IEMs and accessories.

My Background and Sound Preference:

I joined Head-Fi back in 2009 when I started researching headphones for travel. Thousands of dollars later, I’ve built up a collection of mostly budget (under $200) IEMs and headphones. I’m not an audiophile by any stretch of the imagination. Just a music lover. Starting out, I was definitely a basshead. However, the last couple of years or so I’ve come to appreciate other aspects of good sound like vocal clarity, instrument details/separation and bass quality that doesn’t overwhelm everything else. I prefer vocals a little closer rather than behind all the instruments.


Specs and Accessories:

From Sendiy’s Aliexpress page:
  • Function:For Mobile Phone,Monitor Headphone,Sport,For Routine Office Work,Common Headphone,Supports music,for Video Game,Noise Cancelling,Portable,HiFi Headphone,For iPod
  • Support Apt-x:No
  • Resistance:20Ω
  • Frequency Response Range:20-20Hz
  • Line Length:1.2m
  • With Microphone:No
  • Vocalism Principle: Hybrid technology
  • Sensitivity:110±5dB
  • Is wireless: No
  • Connectors: AUX
  • Waterproof:No
  • Plug Type:L Bending
  • Model Number: M1221
  • Communication: Wired
  • Style:Ear Hook

Build Quality and Accessories:

When I first saw the box, the first thing that came to my mind was V-Moda. I believe Sendiy was inspired by V-Moda with the packaging. High quality presentation and packaging all the way down to a leather handle on the box lid. Also, a cloth ribbon has to be cut to get the lid open.

Inside the box, the IEMs and all accessories were tucked away in a hard plastic case. It is my understanding that this case is waterproof. It has a tethered handle for carrying around and is quite large. Plenty of room for everything plus extras. Sendiy also included a smaller, more portable soft case in the shipping box. Caution: opening the plastic case requires an excessive amount of force (at least the one that came with my set). Use care or injury can occur (like a bloodied fingernail LOL).

Inside the case are the IEMs, two sets of silver cables (standard + audiophile), several sets of silicon and foam ear tips, a shirt clip and 6 sets of filters. Note that there are only 3 actual types of filters to tweak the sound (silver, gun metal and black). However, an additional set of filters has been provided that are approximately 1/8” longer than the others. Therefore, one has two length options to choose from which provides greater flexibility for different types of ear canals. I thought this was a nice touch since I have larger ears and chose the longer filters. The filter sound options are as follows:
  • Silver - Enhanced Bass
  • Gun Metal - Natural
  • Black - Enhanced Treble
The included cables are good quality and have sufficient strain relief. One has a straight plug the other angled. The ear pieces are light and feel like smooth metal (which they are). Caution: on my set, one of the MMCX connectors refused to come off. I accidentally put too much force on the cable and pulled it out of the connector. Of course this had to be the more expensive audiophile cable. Moral of the story is, be careful swapping cables.

The included ear tips are ok, but nothing special. None of them ended up working well for me. Sony hybrids ended up providing the best fit and seal. Thus, they are the ones used for this review. Isolation is slightly above average for an IEM.

Sound Quality:

Black Filter - Treble Enhanced

I’m not a treble head that’s for sure. I listened to these only briefly with the black filters. If you love treble, this filter is for you.

Gun Metal Filter - Natural
I found this filter to be enjoyable, but still not my favorite. Treble, mids and bass in almost equal portions. I’m sure this would appeal to the majority of audiophiles. I’ll comment here that I don’t notice any sibilance or harshness with the gun metal or silver filters. The bass, while reduced, still provides adequate “thump” for most genres.

Silver Filter - Bass Enhanced

This is my personal preference and will be the focus of this review. The silver filters present an elevated bass response and make the M1221s more “v” shaped. The bass has nice texture and is authoritative. It remains pretty tight though and isn’t loose like some bass enhanced IEMs are prone to be. Mid-bass is present but not overdone. Bass is still less in quantity as compared to IEMs like the Sony XB90EX or Pioneer SE-CL751. I would like to comment here that going from gun metal to silver increases sub-bass mostly rather than mid-bass. This is a big plus IMO.

Mids sound good and have decent clarity. They are more prominent with the gun metal as compared to the silver of course, but I don’t find them left in the dust or drowned out. This is a case where genre comes into play. For classical, folk, instrumentals (e.g. bluegrass), classic rock, metal, etc. I think the gun metal would be the filter of choice. For EDM, pop, rap, hip hop, etc. silver would be the way to go.

The treble, IMO, is the M1221s weakest link. On the plus side, it is non-fatiguing and somewhat smooth. On the downside, it just doesn't excite. Cymbals lack enthusiasm. Higher registers seem to lack some sparkle.

General Sound Comments:

The stage of the M1221 isn’t expansive or open. You’ll get a more “in your head” experience. Some tracks can even sound congested.

I did notice that track quality comes into play with the M1221s more so than other IEMs I have. Some older tracks can sound dull and lifeless while putting on something like Infected Mushroom really livens things up. This, of course, is noticeable on my other IEMs, however not to the degree that is heard with the M1221s.

Resolution and clarity are very good which is what one would expect out of a 1 DD + 2 BA IEM.

Conclusion:

Overall, I’m impressed with the M1221s. Especially the build quality and accessories. I find them to be an enjoyable listen. At $150, I would heartily recommend them. However, at the current price of $200, they have some stiff competition (e.g. LZ A4 and Pinnacle P1). One is still getting good bang for the buck though even at that price. YMMV of course.

Thanks for reading!

Notes:

This review was performed using 320 Kbps MP3s and FLAC files of various genres (mostly classic rock and EDM (e.g. Infected Mushroom)). Listening levels were moderate to moderately loud. DAPs used were Rockboxed Xduoo X3 (flat EQ) and Cowon Plenue D (rock setting).
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