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These gentleman (& ladies) have The BEST Customer Service in the business. I had an issue with a product and they took care of it right away. Now they have this New Shipping deal with FedEx and I am looking forward to using it. I am sure it will be exactly as described!!

Nice

The IEM is of high quality and excellent for gaming. However, the cable is a bit short and if you are using an amp, you would need a silencer. Other than these points, I am very happy with my purchase.

Great sound, pretty neutral, not too bass heavy.

Great sound and comfort for the price. Highly recommend!

Отличные протяженные ВЧ, мощный быстрый качественный бас, прозрачная середина. Наушники очень хороши.

Perfect

High resolution, less bass, tight bass.
Perfect when paired with a cable and earpiece that complements the bass.

ACH has deep bass and characteristic firm treble, head room is very large.
In say Japanese, " Sukoshi Don Shari".
But, Mid sound is so natural.
So, I think, May be, Nova Driver is being good expression.
ACH Sound is so pleasant.

Exceptional build quality. Engaging bass with good extension and smooth treble, suitable for long listening.

I got a pair of custom earplugs because I'm unfortunately one of those who get headaches from riding at highway speeds. Using universal earplugs, it hurts my ears after awhile, no such issues with the custom ones.

I can hear my music and directions, hear my engine and can talk to people when I'm not wearing my helmet without removing the ear plugs. Being custom for me, it fits like a glove. Wore it when I walked past a constructions, it lowers the volume so it's not over powering and I still heard the cashier perfectly.

Get a pair if you're anywhere where there's loud noise constantly, or even if you're rider who rides often, wind noise damages you hearing!

These were a set of well-fitted and great sounding reshell customs. They did a good job with the fitting and the delivery during the covid period.

I purchased the Thera 2.5mm balanced MMCX with extra 8 braid herringbone option and as soon as I used then with my Campfire Audio Solaris 2020 IEMs I noticed the expanded and deeper soundstage immediately. They made my IEMs sound very similar to the balanced tuning of Astell&Kern SP2000 no matter what source device they were playing from. There is a level of crispness bit still a smooth balanced sound. I had no idea a different cable could make so much difference for IEMs! The previous cables I used with my Solaris 2020 sounds so thin compared to the this Thera cable, I also noticed that this cable is dead silent compared to my older cable from LQI. I'm very surprised indeed! I had no idea cables can change the dynamics so much especially for IEMs!
Expensive if you get the 8 braid option, I would recommend you get the standard braid option because the 8 braid is a little heavy and may not be for everyone.

I will preface this by stating a few things. First, I *am* an audiophile, but I do not have “audiophilia nervosa.” Believe me if you will, but it IS about the music. Gear is simply a means to an end. Second, I am by no means an expert on headphones, earphones and IEMs - I have far less experience that many, especially professional reviewers such as Steve Guttenberg. Third, I am mainly “a tube and vinyl guy” - my primary system consists of a low powered DECware Single Ended Triode amplifier, a Tavish Design phono stage, highly modified Thorens turntable, a Teac UD-301 DAC and a variety of speakers.

The A3H IEMs have exceeded my expectations. I think we all are used to overstated ad copy and marketing hype. My first purchase from AAW/Null Audio was a Capri lightning cable with mic/controls that replaced the stock cables of my MEE Audio Pinnacle 2 IEMs. I quite like the Pinnacle 2 - for the money they are very good and have a pleasing tonal balance and frequency extension. The Pinnacle 2 stock cable, however is a bit of a nightmare. While sturdy, it is pretty stiff and unmanageable. The Capri cable solved that problem and was terminated with a Lightning connector/DAC that improved the sound.

With that good experience, I had confidence to order the A3Hs when there was a sale on “B stock” units. To be honest, the pair I received don’t seem to have any flaws that I can readily see, but I’m not a QC inspector for Null! So, with 50% off, I was VERY pleased.

Enough of the background - on to the review, which I will present in listed form:

PRO

* Tonal balance is very, very good. The bass, midrange and highs are well balanced, nothing dominates.
* High frequency information is VERY well delineated. On Diana Krall’s Temptation, I heard tambourine bells as I have not heard before through other phones. Other IEMs presented them as mushy and indistinct, almost not recognizable as tambourine jingle. Highs are transparent without being at all harsh or etched - there is no fatigue.
* The same is true for the midrange - vocals are distinct and realistic. Instruments are separated, distinct and, again delineated.
* Bass is solid and not mushy or bloated. It is also reasonably “fast”, though possibly not quite as fast the best loudspeakers - more listening is needed. Bass response and fullness is, of course, influenced by the type of tips one uses and how good a seal is made. I am still experimenting with tips; they Comply foam tips are always my choice. But I think I may have to get a slightly larger size or different style, if available, to get the seal I am seeking. I’m not a bass freak, I just want that solid foundation to the music, as long as it’s on the recording. This point leads me to the “Cons” ..

Cons
* The size and shape of the earpieces make tip choice and seal especially important - and, for me, difficult. I’m not a big guy, so maybe my ears are outside the “normal” range, slightly small. Getting an acceptable seal is a chore, and it doesn’t always stay put. Your mileage may vary, of course.
* The cable is very good, pliable and manageable, with good ear hooks, However, I would have preferred a cable with microphone and inline controls for my iPhone. Yes, the purpose of these phones is for listening, not taking calls - I get that. If there were an option to buy an accessory cable with those features, I would not have mentioned this.
* Cable connection - it’s 3.5mm, with no option for Lightning a la the Capri cable. Sadly, the Capri cable is MMCX while the A3H bodies connect via 2 Pin. Using the Apple Lightning adapter is probably a compromise with respect to resolution and sound quality, especially if I am using an APP to listening to DSD files. FiiO makes an adapter that is probably better, but that adds bulk and fuss.

Conclusion

The A3H are great IEMs and represent high value, even at their list price. Given the driver complement and hybrid technology employed, it’s a given that the size of the housings is what it is, as well as the shape.

None of my cons (which are personal and perhaps picky) rise to the level of deducting any rating points/stars. After two purchases through the Null Audio website, I am a very happy customer. With an option of a cable terminated with a Lightning DAC, I would be ecstatic.

Well done - highly recommended.

The low range sinks and the high range does not get stuck.

Audio & Charge Headphone Amplifier for iPhone, can we have a white version?

Never thought that this cable will change my listening experience with MIC. Using with my UIEM UE7 Pro

I just got my ach, and it was really amazing. The most impressive thing is the highs, the ceremic twetter really sounds like the electrostatic driver, and gives a very crysp highs with no irritating peaks. The mid and bass are also well balanced. This is definitely one of the best universal IEM in my collection! I can't believe that you sell it at such low price ! Anyway, it's incredible !

The sound quality of these IEM’s is awesome and the sound stage is very good. Positional audio in games is accurate and the microphone quality is excellent.

Quality DAC without external batteries and allows you to charge your phone at the same time!

I got this with some Iems sold here and I've tried it on a few of my other iems and find this to be a really good entry level cable. Still has a really nice feel and weight for the cost. Same quality as their more expensive cables. Sound signature from the cables is fine and better than most stock cables for iems under the $400 mark.

Took a while to break in but once they were broken in they sound great!! Excellent all around

高級なイヤホンと比べて、少し解像度が低いかもしれないが、普段使用するには丁度良く、聴き疲れしない。

Bass depression, crisp midrange, endless highs, great

Arrived and the UIEM looks just as nice. Glad I bought this.

It's a pleasant cable to use. Addition of the mic is useful for when you need to speak without using laptop microphone which can pick up typing sounds.

Treble：clear and comfortable, better than my last UE TF10
Mid：I think it's AXH's selling point. Leaning forward and smooth. TF10 hid the mid and now they spring out beautifully.
Bass：A little thin and doesn't go deep, but still has its quality. Perhaps it would be better after changing the cable to a UPOCC.

Overall：5 STARS for pops, jazz, classic and ACG, but 4 STARS for rocks, heavy metal.The separation is excellent and sound stage is 3D-like (with 4.4 balanced FOB&my WM1Z). This is a gorgeous IEM with high cost-performance ratio and workmanship.If you like crystal treble and mid then it won't let you down~

It's the cheapest cable inbthe NA line up, yet I found I like it the most among all other models!My first impression is that this is a beautifully built cable, when I link it up with VE8, I was immediately shocked by the huge soundstage, and the bass is very prominent. Yet, the vocals is still very clear and transparent ! I got some more expensive cables from NA before,but I really think this is the best cables for my IEMs.

The resolution is improved in all sound areas. Especially, the bass texture is improved.
The color of the cable is bright. I imagine a darker color from the photo.

It's a beautiful cable that makes you proud.
The clarity of the sound is improved and the treble is more deeper.
I really like it.
The MMCX connector is also good.

Good upgrade cable beautiful and good quality