General Information



Brand:ISN Audio
Model: D10
Driver: 9mm Dynamic driver
Material : resin
Impedance : 16 Ω @1khz
Sensitivity : 100 ± 3dB @1khz
Frequency response : 20-20kHz
Connector: MMCX
Plug: 3.5mm Audio/2.5mm/4.4mm Balanced
Cable length: 1.2M

ISN D10 earphone
8 pairs of silicone eartips
Carry case
Clean brush

Latest reviews

Pros: Unique "sub-woofer" like sub-bass
BIG soundstage
Impressive detail retrieval
very good instrument separation
excellent cable and even more so when you can actually choose between standard SE 3,5mm or balanced 2,5/4,4mm
Cons: Timbre
Treble, affected by the "sub-woofer" bass and sometimes sibilant or sharp
Mids, timbre affects the mids
Overall bass not very clean

Disclaimer: Bought at Penon Audio with their early bird discount at my own expense. Burned in for at least 50 hours.

Price: 175 usd (early bird 135)


Brand: ISN Audio

Model: D10

Driver: 9mm Dynamic driver

Material: resin

Impedance: 16 Ω @1khz

Sensitivity: 100 ± 3dB @1khz

Frequency response: 20-20kHz

Connector: MMCX

Plug: 3.5mm Audio/2.5mm/4.4mm Balanced

Cable length: 1.2M



ISN D10 earphone

ISN S4 4 core SPC cable

8 pairs of silicone eartips

Carry case

Clean brush


Cable: you actually get the choice if you want a balanced 2.5/4.4 mm connector or the standard 3.5 SE connector, so that is great for people that want to use a balanced cable. The cable itself is priced at around 60 usd and there is no need to upgrade it (I prefer it over cables such as the 175 and the 173, both of them costs more than 2 times if not 3 times of the S4). It has a working chin slider, indicator for L/R (this should be the standard for all cables, a clear and visible L/R indicator) and no ear hooks.


Build: entirely made out of resin, has a vent hole and has a lip on the nozzle (metal dust filter) so tips stay on good. A very compact build and should fit those with small/medium sized ears perfectly, although for me I would prefer it just a tiny bit bigger.

Fit: as mentioned, since the build is very compact it should fit most people. For me it is one of if not the best fitting iem because when you try to remove it, it feels like having an octopus´s suction cup on your ears. The seal is very good with this and I see no way for it to fall of during use or even needing readjustment. (very hard to remove, so that should say a lot about its fit.) There is some driver flex for me though.

Comfort: since it has such a tight seal, it isn’t that good when it comes in comfort. I cannot use it for a long time because my ears get sore from the tight seal. (my skin in general is very sensitive so keep that in mind, for you guys with a more robust skin you shouldn’t have any problems with the comfort unless you have really small ears, in which you will probably have problems with the fit which leads to comfort problems)

Isolation: very good isolation even with a vent hole, most likely it is the tight seal that makes the isolation so good along with the build that covers the entire ear.

Setup: Fiio M11, stock cable (4,4) and Acoustune AET08

Lows: versatile bass, while it is boosted quite a lot it can rumble and be punchy. Meaning that on most bass focused songs it is a very good match since the bass In the D10 is able to reproduce every kind of bass. Sub-bass focused but mid-bass is not far off. The only thing lacking with the bass is texture, it cannot match some other iems (which I come to in the comparison section).

Mid-bass: punchy and tight mid-bass, quality is good and stays away from the mids. While it is tight and punchy, I wouldn’t recommend it for rock/metal because the overall mid-bass isn’t very clear and clean. You can hear it in this: , while the bass certainly is tight here, the overall low-end is quite muddy and makes it sound bad (due to the sub-woofer like sub-bass)

Sub-bass: versatile sub-bass, punchy and can rumble. Focus here rather than mid-bass which makes stuff like EDM very good with it. The meat and potatoes of the D10. Sounds like a sub-woofer so that is very impressive, but the texture isn’t anything special, and also makes the overall bass sound muddier than normal (due to the sub-woofer sound).

Mids: leaning a bit more towards female vocals due to the 3,5k peak but otherwise a very good balanced mid-section. What is most impressive is that even with the big bass, the vocals are still not swallowed by the bass and has its own spot (not mid forward though and not recessed either).

Female-vocals: detailed and crisp, but since the timbre is not that impressive it is not as natural as some other iems.

Male-vocals: a bit too bright for male vocals makes it sound less natural than the already non-natural female vocals. Unexcepted since the D10 has so much bass.

Highs: the treble is a bit sharp. There is a sharp peak at around 3,5k (very similar to the shuoer tape´s peak but definitely not as much) that makes it sibilant on some tracks for example this ( ) being sibilant and this ( around 1 minute to 1 minute 10 sec for example) being very sharp but not quite at the sibilance level. Overall quantity isn’t that much nor is it too little, so it has treble energy while not sounding too bright but definitely leaning on the brighter side.

Soundstage: One of the biggest soundstages, it is definitely the biggest out of all DD sets I have but not quite on the same level as the LZ A6 for example.

Tonality: a very balanced iem where even though the bass and in some cases the treble takes the focus, the mids are never recessed but there is a bass and treble boost. Not very good timbre due to the treble, it doesn’t have as good timbre as the blon 03, Final Audio E5000, Audiosense DT200 or even the tribrid LZ A6.

Details: very impressive amount of details, even more so when you factor in the amount bass quantity it has and it can still keep the details without losing any due to the bass.

Instrument Separation: very good separation, the technicalities are extremely well done for a single DD which in most cases usually aren’t that good in technicalities. (you can in a way say that the technicalities are more like a BA set than a DD because BA usually have better technicalities while having worse timbre, which is the case in the D10 although it definitely sounds like a DD make no mistake about that).

Songs that highlight the IEM:

Good genres: EDM, Dance, hip-hop, orchestral non-classic

Bad genres: Rock,metal, Jpop, acoustic songs/genres


Blon BL-03(mesh filter mod):
sub-bass is more textured, tighter, faster and extends more on the D10. Mid-bass quantity is higher on the 03 (but since the sub-bass sounds like a sub-woofer it does affect the mid-bass in a bad way), D10 is tighter, faster and more textured. Mids are a bit more forward on the 03, both female/male vocals. Treble sounds more natural on the 03 but it also has a bit more quantity.

Soundstage, details, separation are much better on the D10 but don’t come close in timbre. 03 is a much more natural and correct sounding iem (even with its bass boost). D10 is a fun iem that has the sub-woofer like sub-bass that makes bass focused genres very good with it. 03 is a more versatile set since it sounds more natural and clearer.

LZ A6 (pink filter): Treble quality is miles ahead of the D10, quantity is a lot more though so risk for sibilance is higher (not for me though). Extends much more and also has a lot of air on the A6 (too much to sound natural but it sounds very unique due to it).

Mids are perceived as more forward due to it having a more controlled and lesser bass quantity than the D10. Vocal balancing between male/female vocals are a bit better on the A6, not leaning as much to the female vocals as the D10 do.

Mid-bass has a bit more texture on the A6 and it is much faster and tighter, making it a very clean mid-bass. Sub-bass keeps the texture, speed and tightness advantage over the D10 but the D10 has that unique sub-woofer sound to it. So, it extends a bit more and rumbles more.

Soundstage, separation, details and timbre is much better on the A6. A6 is a more natural, versatile iem and also much more treble-energetic than the D10. D10 is better if you are treble-sensitive (it does have a bigger 3,5k peak though) or if you want a more sub-woofer like bass with rumble over tightness/speed.

Shozy Form 1.1: D10 has more sub-bass quantity, rumbles more, while the 1.1 has more texture, tightness and speed. Mid-bass on the 1.1 is faster, tighter, cleaner and more textured. Mids are more forward on the D10 than the 1.1 and also have better quality. Treble on the D10 is sharper, while being warmer (quantity lesser) and sounds more unnatural than the 1.1 (1.1 doesn’t have a very natural treble either though).

Soundstage is bigger on the D10, but separation, details and timbre are better on the 1.1. D10 is better for EDM and similar music, while the 1.1 is a more versatile set.

Conclusion: Overall since you are getting such a good cable, build, fit, isolation and unique sub-woofer like sub-bass I believe it deserves a 4,5/5. But if I were to judge it solely on sound it is a 4/5.

Cable source:
Yes, got it with discount, i just hope its better than DM6, will see. Thanks.
I grew up listening to metal. Was in a metal core band. D10 sounds great for rock n metal. You will see..I do think the D10 is more source dependent than the H40. Could be the reason why we have different takes on them. But ya rock n metal the D10 has no issues imo.
@Dsnuts to me if they want an iem for metal/rock I would go for the LZ A6 instead, with its fast,tight and very clean bass it is very good for rock/metal. Although at the price of 135 usd it isnt really a problem because of the cable. (I mean I even prefer the S4 cable over 175 for some iems so...)
Pros: Higher end build, semi custom design. Extremely well implemented single dynamic design excelling in coherency, clarity, detail, imaging, timbre, sound stage with an airy sound. Energetic treble with good extension, clean mid range with good use of space. High quality bass to extended sub bass rumble. Comes with a highly regarded premium ISN S4 cable worth $58.90 by itself. Above average isolation and comfort.
Cons: Your gonna wish your other in ears had a similar high quality cable that came with it.
ISN has been creating some very intriguing designs lately and for a company that was previously just known to produce some outstanding IEM cables has now started to focus on some well regarded IEMs. The H40 is not new to the scene now as I had the privilege of introducing their well received hybrid IEM to headfi toward the end of last year.
ISN D10 Left, ISN H40 Right.

The D10 is a follow up product from the H40 which once again shows how apt the ISN crew are at tuning. Here we have a similar all resin design but this time utilizing the tried and true single dynamic design. This resin design is a semi custom shell design that is common nowadays. The shell is very similar and shape of their previous H40 but now a bit more slimmer and smaller physically in design. Which addresses a few guys that took some issue with the fairly bulky yet ergonomic design of the previous H40. The shell is now at a moderate medium in size instead of the large shell of the H40. Comfort is excellent and fits my medium sized ears without any fatigue or pressure points.
Another aspect that has been upgraded is the pack in cable. The cable that now comes with the D10 is the well regarded ISN S4 a 4 core crystal copper plated with silver cable that by itself costs $58.90 to be exact sold here. As of writing there is nothing but 5 star reviews regarding this cable. I can write an entire review just based on the ISN S4 but just know you're not getting some cheap thrown in cable. It will most definitely be an upgrade to most included cables that come with your in ears. Why does this matter? Well that just eliminates the need to upgrade your cable. In fact when ordering you can order the ISN D10 with any termination you want to use on your sources. This is always a plus. I wish all manufacturers would take note of this. Very appreciated that you can just get a balanced ISN S4 with your D10 right away. Props to ISN for this.
ISN’s entire package comes to you inside their rectangular semi hard zip up case. 3 types of silicone tips, a cleaning tool, ISN S4 cable and the earphones themselves. This minimal packaging allows ISN to give it to you where it counts. This packaging isn’t going to win an award for presentation or have a huge variety of accessories. ISN is all about where it counts. A very high quality high value IEM for your hard earned cash.
D10 Sound impressions was based on using them in real world situations using my DAPs Fiio M15, Ibasso DX160, Shanling M5s, Shanling M3s. IFI Black label.

The first thing that hits you when you hear the D10 is just how spacious and airy the sound comes at you. Of course this isn’t anything new as the H40 has that spacious sound. It seems to be something of a “house sound” design that ISN is going for. Your not going to hear an ISN earphone that sounds average in sound stage. The D10 follows the H40 in that regard. The stage is above average in width and shows a good amount of depth. Not the deepest sound as that is where I feel the H40 is better. D10 being a single dynamic design improves on the coherency factor due to being a single driver design.

Treble of the D10 has a good amount of perceivable energy. Has a clean, crisp, detailed emphasis with the right amount of extension. Main focus for treble is lower treble and with very good micro details in the region. The overall sonic quality is energetic due to the ample treble emphasis. Don’t mistake treble energy with treble fatigue. It does a fine job of not crossing over the fatiguing line when listening to the D10. A good way to test how much treble can fatigue is if you can listen to Trance music without fatigue. D10 passed this test with no issues what so ever. Treble shows no grain but comes alive when called for and has an equal footing in emphasis to the bass end. The treble shelf from 3khz-4khz brings a good amount of clarity and precision for upper mids and lower treble. A lower emphasized treble peak at 7khz and then even a lower one at roughly 13khz. The treble is tuned with detail and energy and is not prone to flaws in the region.
ISN H40 Left, ISN D10 Right.

Mids bands of the D10 take a slight step back from treble and the bass end but due to the excellent imaging and clarity the mids don’t feel like it is being overshadowed. Vocals actually sound excellent on these. While not as forward sounding as the H40. Mid band reach and layering is impressive for a dynamic design especially at this price. This slightly laid back mid range design allows for the stage of the D10 to have a width that is not too common among in ears. Lower mids has a steady rise toward the mid bass and even greater toward sub bass. This allows for a clean, clear detailed mid band presentation that once again has no perceivable graininess or unevenness. The one aspect I have learned about how sound tuning affects your perception of stage and scale is if your earphone has a forward mid section that lessens the stage perception. These give you that grand hall sound and that is a part of the design.

Bass has the most prominent energy coming from the sub bass regions. What you're getting is what I like to call a technical fun sound tuning. So I will say you have to be a fan of bass emphasis in general to understand this tuning. These have a sub woofer like effect due to the strong sub bass emphasis. If you sound preference leans toward forward mids and not too much bass emphasis. These might not be for you. However if you love a good emphasized tight low end punch with a strong textured rumble in the sub bass. These will bring a smile to your face.

The D10 will reach the deepest of notes with little effort. It has zero roll off at 20hz. Your tracks that have some low end rumble? These will show you just how much low end rumble is proper. Subbass is really the star of the show here. Bass has a fairly quick decay in the mid bass region. But has that staying power for them low notes. Rumble in the jungle has a new meaning. One thing I found out during my testing period for the D10 is. This may vary depending on how your ears are shaped, but for me. I was able to increase and or decrease perceivable bass emphasis just by loosening the fit of the ear pieces a touch or pushing the pieces in for a tighter fit to increase bass. Bass adjustment on the fly I like to call it.

A technical designed fun signature means you're gonna feel them double kicks for metal, while the upper mids emphasis gonna give you that guitar crunch proper screams. Means these will rumble your face off for hip-hop. Technical in that you can hear your orchestral tracks with great clarity and properly defined imaging. Then come full bore for some Slayer. Sound separation due to that wide spacious sound gives room for them instruments. Sound is versatile and will have you hearing your bassy tracks proper. Traditional bassy in ears are not gonna get you this type of clean sound with your bass. And for that alone these are worth a look. I had some fun with this one and, by golly I think ISN has done it again. They have created a very likable sound I do have the word "fun" in the sound description. It marries a technical ability in much higher end in ears with a very likable sub bass emphasis that is missing in so many in ears. Does your in ear sound clean has an airy wide stage with a bass rumble of a sub woofer?

So on this portion we have some comparisons to some comparable in ears.

D10 vs H40.
ISN H40 Left, ISN D10 Right.

H40 has the fuller bigger sound in general but with a more forward more dimensional sounding hybrid design. I consider one of the essential in ears from last year. ISNs debut in ear will be one for the ages and I feel leaves a high bench mark for the company. The D10s have a more leaner mid range but has slightly more clarity in the region. H40 has the more dimensional better layered mid range due to the BA it is using. The treble emphasis has some similarities but the D10 does a better job of having energy without adding vocal flaws or grain better than the H40. H40 does have a slight emphasis peak in the 7khz range where the D10 does not. So that might be the main difference here.

Bass emphasis is tighter on the D10 with a quicker decay. Sub bass emphasis is similarly extended but has a bit better texture on the D10. Which is surprising since the H40 has a dedicated dynamic for the hybrid. When taken as a whole I feel these two compliment each other in the way the sound presents itself. The H40 is very full bodied, dimensional and musical while the D10 has it’s wide stage, neutralish mid range with great clarity yet still retains that bass end for people that love their low notes. It is the yin and yang of sound signatures.

D10 vs NF audio NA1
NA1 is tuned to have a reference type of definition. It has a cooler tonality due to the treble extension, clarity and detail. If your a treble guy or a macro/micro detail guy. NA1 will be enlightling for you. The D10 has more in the way of sub bass emphasis vs the treble skew U fr tuning of the NA1. Isolates slightly better. NA1 is more for discriminating detail oriented listen. The D10 is more you can listen to it the whole day, enjoy a punchy bass w excellent low end rumble, engaging and fun to listen to all day type of listen. NA1 wins at Macro details more so than the D10 but the D10 makes up for that with a better well rounded overall easier to listen to tuning.

D10 vs NF NA2.
So basically in my estimation the D10 is actually a better, more refined version of the NA2. NA2 tones down the treble skew of the NA1 and is tuned very similarly to the D10. Tonality and sound balancing is similar. I feel the resolution and airy stage of the D10 is where the D10 is worth the extra. Has better technicalities, stage and overall details over the NA2. For enthusiasts that want something similar to how I described the D10 but cheaper will do well with the NA2 here. Sound Fr should be identical in approach but the D10 is more premium in design and overall refinements over the NA2. NA2 is like a little brother of the D10. The most identical of all the earphones I have in comparison sonically. The D10 is somewhere in between the NA2 and NA1 in sound design so while not exactly the same sonically, I feel it comes more closer to the NA2 than NA1.
Bonus pic!! Your seeing the newest iteration of the ISN D10. This is the picture that was sent to me as it will be the new ISN D10 color. A dark blue vs the dark purple that was initially used. They also colored the ISN S4 with a blue tint to the sheathing on the cable to match the dark blue of the new ISN D10.
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Comparisons are definitely helpful and that is a nice cable.
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Thanks for the nice review! Which penon iem will pair well with hiby r5? i prefer natural sound with slight bass boost and soft treble with good extension :) this or penon sphere?
It is like your describing the Penon Spheres. Those are a marvel for being a single BA. These are more V shaped Fr. Meaning they have more treble sparkle and sub bass rumble the sphere but from what your wanting it seems the Sphere is what you are looking for.


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