I was hoping to use this with a gaming headset. Unfortunately, the TRRS plug is ONLY to pass button commands from the amplifier to the host device (e.g. smartphone). If you connect a headset with a microphone, the microphone audio will be blocked (not passed through). If you're a listen-only user that doesn't care about microphone support, then this is a perfectly fine audio amplifier.

J’utilise cet amplificateur de casque avec mes Senheiser HD-535, de type électro-accoustique , que je branche à mon iPhone 12 Pro. Très bon rendement sonore, avec contrôle du volume, pause et fonction Bass Boost. Fonctionne bien et fabrication soignée. Je le recommande.

When using the Logitech Pro over the ear headphone with my Oculus Quest I needed to amplify my sound output, this headphone amp works perfectly! It is small enough to Velcro to the headset strap and provides a substantial increase in the sound quality and volume for the Oculus Quest. The only issue I found is that the volume controls on the amplifier does not adjust the volume on the Oculus Quest, this is really a Non-issue because the volume of the quest is adjustable in VR as well as physically on the headset.

a very well made for for portable use. this app can power my vintage hard to drive Sennheiser HD 420 600 ohm. very simple to use does not add any hits of static or distortion of any type. even works well off my Walkman .. and the bass boost works incredibly well without distorting the mids and highs

Works as advertised! Bass boost is very sufficient and volume gain is phenomenal! Only downside is a poor switch design/placement. Side switch to control functions is tiny, flat, and recessed that makes it difficult to slide for functional use. function labels are sure to be erased in due time as your finger will eventually smudge it out. Function lights are too miniscule as well. Attached cord is sturdy but a more pliable one would have been more consumer friendly. Overall, quite expensive for a 2-setting only booster but once you use it, specially with OTE headphones, you wont listen to music without these ever again!...

Den Stern ziehe ich ab für den wirklich sehr hohen Preis.Ansonsten: es ist ein sehr gutes Produkt. Sehr praktisch: es kann immer dazwischen gesteckt bleiben. Wenn man es nicht benutzen möchte, kann man es ausgeschaltet lassen und lässt das Signal einfach durch. Die 12 dB Verstärkung sind sicher die Obergrenze dessen, was die Kopfhörer noch mitmachen ohne zu verzerren. Wenn also etwas verzerrt klingt, liegt es nicht am Gerät sondern am Pegel der dann einfach schon zu hoch ist. Da hilft dann nur die Lautstärke nicht voll aufzudrehen. Was mir noch gefällt: extrem einfaches handling und aufladen per USB-CÜbrigens: ich benutze das Teil mit einem digitalen saxophon. Es macht sich hervorragend sowohl bei Betrieb mit Lautsprecher (JBL Charge 4) als auch mit Kopfhörer (AKG 812) und insbesondere der Bass Boost verbessert den Klang in beiden Fällen nochmal deutlich, er wird dadurch “echter“

I really like this amp. I use with Sennheiser HD 599 headphones. It has made listening to streaming services on my phone sound as good as listening through my home sound system. I've always had my phone volume maxed and now it's just over three quarters up. I like the small in line shape and fuss free control. I didn't want an amp that was awkward to carry this just looks like part of your headphones.I have also used with PS4 controller, it takes the volume to a much better level for me. The volume control buttons cannot adjust the PS volume.There is a short charging cable supplied but I use a longer (Samsung) type C USB cable. There is zero affect on sound quality if you charge whilst listening.

I am definitely not the target audience of this device.Maybe I am just not "audiophile" enough to appreciate the magic, but it turned out to be completely useless for me - it produces a very loud hiss when nothing is playing which is very distracting and annoying, I just couldn't keep my earphones on when nothing plays. I'm not being spoiled here, it's not just a faint background hiss, it's white-noise LOUD, especially in extra bass mode. Worse yet, the loud hiss also drowns everything when sound is playing and can be heard still in the background. I tried connecting it to many different devices, from different desktops and laptops, phones and tablets, they all produce this hiss.Maybe the aux connector on all those devices is producing this hissing noise and the HELM DB12 simply amplifies it so it's not at fault, but it matters very little if the end result is unsatisfying.Regarding the amplification - it's loud. Louder than healthy. It forced me to lower the volume on my devices to the bare minimum to avoid making my ears bleed, it's probably not suitable for anything but the highest impedance, high grade studio earphones. I tried it with 6 different low to mid-ranged in-ears and headphones, and even on the lowest volumes my ears are still ringing from sound spikes during gunshots in a game I tested, 24 hours after it happened, even after taking the phones immediately off.The sound quality is...the same? It's amplified, sure, but not "cleaned" or improved, with or without the bass boost. Again, maybe I'm just not the target audience to appreciate the nuances, but it just wasn't doing anything for me other than hurt my ears.So this device would be more appreciated by audiophiles and sound connoisseurs with high impedance headphones and gear who could appreciate it, but I guess those people already have expensive DACs and amplifiers that do a better job than the HELM DB12 which also introduces noise coming from the aux connectors. So it's lost on us simple folk, and lost on the audiophiles...sad, but this device probably shouldn't exist.I shipped it back right away and I advise learning from my mistake and not purchasing it out of curiosity, unless you know EXACTLY what you're getting, caveats and all.

With the volume level on the iPod Touch 7th being totally useless, this thing is a lifesaver! If I had one gripe, it would be the cable is too long

What a phenomenal product! When I first unboxed my Helm AAAmp cable, I was skeptical. At the lower price point, smaller design, and THX amplifier I had never experienced (but heard good things about), I was curious to see how this product would stand up to some of my favorite go-to portable amps. So, naturally, I lined up some of my favorite amps, including the Audioquest Dragonfly Red, CHORD Mojo, Earmen TR-Amp and SCHIIT Vali.I then conducted a full day of testing (remote working sure does allow for some ample listening time) using a variety of earphones & headphones with a range of impedance and driver technology. For reference, some of the devices I used were my JH Audio Layla's, Dan Clark Audio Ether-C, Meze 99-Classics, Westone W-80, Sennheiser HD-650 and both 1More Triple & Quad. For a source, I primarily used my Microsoft Surface laptop streaming TIDAL, but also tested on a few of my HiFi DAP's.One after the other, this little AAAmp cable rose to meet the complexities and demands of every earphone and headphone I used. It produced easily enough power to sufficiently drive my Ether-C (71x45mm Drive at 23ohms) without ever needing to surpass 50% volume level, yet also was sensitive enough to pair well with my multi-driver IEMs and their nuanced dynamics.Just for fun, I also plugged in the AAAmp to my PS4 controller in tandem with my MEZE 99-Claasics, and WOW did it make a world of difference! Any competitive gamer would absolutely lose their minds with excitement to hear the sheer power and detail this amp puts out when playing your favorite game (whatever that may be). Definitely a must have for gaming.Overall, I would rate this Helm AAAmp Cable at a 4.5/5. In comparison, my Chord Mojo (up to now my favorite portable amp...) I had given a 4/5 rating. This Helm Amp Cable has officially taken the podium as my new go-to portable amplifier. Well done Helm!Pros:- Extraordinary power output to drive the most demanding headphones.- Very clean and dynamic presentation of sound, without any added color.- "Bass Boost" may be the first ever bass boost button I have ever tried that actually provided a pleasant change to sonic presentation, rather than just blowing out the low end. Extremely clean, and a very nice little added feature, especially for gamers and lovers of bass heavy music.- Small size and USB-C charging make this the most portabl DAC of its power output currently available on the market. Slightly larger than products such as the Audioquest Dragonfly series, but this Helm AAAmp cable puts out far more power.- Solid battery life (5+ hours depending on what headphone I used was my general experience. With some earphones I was able to get far more usage).Cons:- 3.5mm cable without any provided adapters for USB-C or Lightning will limit the usage of this amp to devices that still have a headphone jack. Not a problem for use with laptop's, gaming, or phones that use a jack, but will pose a challenge for iPhone and some newer Android users who's phones don't have a headphone port.- In my personal opinion, the cable was a bit longer than it needed to be. That said, some might enjoy the added length!