アップグレード版 Douk Audio U3 ヘッドアンプ, Mini クラスA HiFi ヘッドフォンアンプ デスクトップホームステレオアンプ DC5V

オーディオインターフェイスのヘッドホン出力ではパワー不足でまともに鳴らないAKG-K701を鳴らすために購入しました。実際にK701を余裕で鳴らしてくれますし、音質も申し分なく残留ノイズ等もまったく無いといっていいレベルだと思います。SONYのMDR-CD900STも鳴らしてみましたが当然のごとく文句なしでした。この価格でこの音質と余裕のパワーにはとても満足しています。

まだ届いて1日しか経っていませんが値段以上に良くてびっくりです。 画像にはUSB-DCケーブル付属とありましたが普通にACアダプターの電源が付属してました。 PC-オーディオUSB-SMSL D1-RCAケーブル- U3-イヤホンという感じで接続しています。 ノイズ対策でモバイルバッテリー経由と付属の電源を聴き比べて見ましたが付属品はノイズ等もなく嬉しい誤算でした(˶' ᵕ ' ˶) 基本的にFPSゲーム用途ですが自分のバカ耳では音楽、動画視聴も高音質に思います。これまでfiio k11 k7 k9 k15 その他たくさんの据え置きやポタアンを試してきましたがなんかもうこれで良くね？って思ってしまうくらいでした(笑) 余計な機能は要らず6.3mmや3.5mmしか使わない。という方なら全然アリかなと思います。 このレビューがどなたかの参考になれば幸いです🙏🏻

ACアダプタは無いと書かれてましたが、 同封されてました。

オーディオインターフェイスのヘッドフォン出力の音量で上がらない方におすすめです。 私は10段階4くらいで十分でしたのでヘッドフォン次第では難聴になるレベルまでいけるのでは無いでしょうか？

今まで「アンプ」目的で使っていたミキサーの音量に不満を感じて、このヘッドフォンアンプを見つけて購入しました。最初はミキサーの後に取り付けたのですが、それだけで音量はもちろんですが、音質の向上も感じました。しかしそのままだと高周波ノイズが乗ってしまい、どうしても気になってしまったので「ミキサー」を外してみたところノイズが収まりました。ミキサーは「切り替えスイッチ」代わりとしても使っていたのですが、切り替えスイッチは別途用意することにしようと思います。 初めて「ヘッドフォンアンプ」というものを購入したので他の製品とは比較はできませんが、音量・音質ともに以前より良好になりました。

このアンプは前々からいい音なのではないかと思っていたのだがやはりそうだった。かなり厚みのある音で日本製のような神経質さは全く無い音。よくあるコストパフォーマンスだけのゴミとは違う。

本製品のような、RCA端子入力からイアフォンへの出力という機能を絞りこんだ機種は珍しいです 少し前のミニコンボなどと組み合わせて、最新の能率の高いイアフォンを接続する使い方をすると、手持ちの音源の新しい魅力を発見できることでしょう

パソコンのUSBポートから電源を取ると「ピー」というノイズが入ります。 音量の大小に関わらず、常に入ります。 USB専用電源からの場合はノイズは入りません。 また、アンプ側DCジャックのプラス端子径が大きく、一般的なACアダプターのプラグは入りません。 音質はクリアで、左右のバランスも悪くありません。

Occasionally, all or most of us at least, wind up purchasing an inexpensive audio device, expecting that it will perform far below expectations - yet our curiosity (based on having seen advertisements or word of mouth) have enticed us to complete the purchase. Such was the case for me when I happened to stumble upon this particular Douk Audio U3 mini head amp on Amazon - noticed the price - and wondered if it would even approach marginal status. And since I happened to have several budget level DAC's such as the Schiit Modi 3, the SMSL M100, and a few others, I thought, "Why not try out this budget head amp to see if it can hold up?" When it arrived I was not prepared to be impressed the way I was. To begin with, the U3 is built like a small tank, exceptionally well crafted with a logical, simple, and impressive front and rear panel layout. The craftsmanship of the U3 is more reminiscent of far more expensive products. Additionally, for those who understand and appreciate being able to make various modifications to electronic devices, the U3 has a pluggable op-amp socket design, which allows one to experiment with different sound signatures - with op-amps being a dime a dozen now-a-days (and Amazon has quite a few of them). Now it is important to note that this is a "Head Amp" only. If you have a DAC and want to connect it to a Head Amp which also has outputs on the rear of such a device to connect to speakers, etc., that will not be possible. The U3 has RCA inputs only (no outputs), so it will serve as a headphone amplifier only. And regarding the U3 being a great Head Amp - well, the best compliment I can give it is to remark, "The U3 truly gives good head...." Haaaaaaaaaaaaaa I first paired the U3 with the SMSL M100 - a simple, yet impressive entry level DAC. Now normally, I always allow audio gear to go through a period of burn-in for 24-48 hours (which I eventually did with the U3), but just for the heck of it, I began playing music through it immediately. Headphones used were the HiFiMan 400i 2020 version, Sivga 007, Philips SHP 9500, Status Audio CB-1, and the Brainwavz HM5. Music being used for evaluation were various large orchestral classical, big band jazz, Latin jazz, and other larger orchestral varieties. For evaluation purposes, It is always a good idea to listen to large orchestras that feature a wide variety of instrumentation. This gives you a good reference point how an audio component can relay orchestral timbres of each instrument. Even upon the first turn-on, I was immediately struck by the musicality of the U3 and the ability for it to further separate various instruments with the proper air or space around their locations. Previously, when I listened to headphones through the likes of the iFi ZenDAC, Soundavo HP-DAC1, Micca OriGen G2, Fiio K5 Pro, and FX-Audio DAC-X6 Mk II, they all displayed different sound signatures - with some models displaying a very bright sound signature, while others sounded bland, and some being very good for the money. With the U3, I was now hearing instruments that previously were not noticeable because of the blending of the sound within the various orchestras. Small, quiet instruments such as cymbals, triangles, and others, were no longer buried behind the entire orchestra. Rather, they were lifted and open to where you could hear them distinctly. All the instruments playing - whether via a full symphony orchestra or a smaller, more intimate jazz group - had this openness to the performances. It was as if a substantial veil had been lifted between the listener and the music. Additionally, imaging (the placement of instruments on an imagery stage) was so precise that you could envision the musicians and exactly where they were located. Depth was also exemplary. However, do keep in mind that if you are running a horrible recording or a poor stream of lower quality music, the U3 will let you know. I should also add that this particular budget head amp is a great device to determine how good your headphones really are. Now do note that I've long discovered (and believed) that warming up/burning-in an audio device is essential because the sound signatures can change over time. When you first turn on the U3 and begin listening, it is very detailed (with the stock Op Amp that comes with it) and dynamic - and perhaps may sound bright to some. As time goes on - in my case being just 48 hours being left on all the time - the overall audio character warmed up - yet the sound was still detailed with plenty of dynamics. As an aside, you should leave your DAC's and/or Head Amps on all the time as they use negligible power. It's just not good to turn off and on (constantly) audio components, and you'll eventually discover that your audio components will have a longer shelf life in the process. Another positive aspect about the U3 is that musical instruments have an accurate timbre to their sounds - not colored at all. I kept mumbling to myself, "Is this thing really a thirty-something dollar head amp?" If ever there was a piece of audio gear that defied expectations (for the better), the U3 meets that scenario. Following my discovery of the U3's capabilities, I then wondered that if the U3 sounded superb with the likes of the entry level SMSL M100 or the Schitt Modi 3 DAC's, what would it do with far more expensive and higher end DAC units? In fact, in my opinion, I'd still call it a bargain if the U3 was priced at $100-$125 - it is that good. Like I said, it makes you now want to pair it with far better (more expensive) DAC's to evaluate the sound quality, which I can only imagine would be improved even more so. Look - I do quite a few blogs and reviews about various audio gear. This Douk U3 threw me for a loop - I found it that stunning, given its ridiculously low price. I strongly suggest picking one up before the price rises. I'm actually in the process of ordering a second one - mainly so I can change out op amps in one, while keeping the other with the stock op amp. At this price, it's a no-brainer. Given my previous experiences with evaluating high performing, yet very inexpensive audio items - which after a series of excellent reviews - were predictably followed by price increases by the vendor. I believe that once Douk sees the reviews on the U3, like anything else, they may very well raise the price. Now let's address the ability to easily remove and change out the Op Amps. This is something I had initially not considered doing with the U3, but since Douk specifically advertised this feature, that piqued my interest. So I purchased several Op Amps and tried them all. And yes, there were sound differences - some making the U3 sound brighter, some harsher, and some warmer. I found that upgraded Burson Op Amps - albeit a bit more expensive - did the best and noticeably elevated the sound performance of the U3. The Burson V5 version homogenized the sound, had a warmer upper register, yet still maintained excellent detail/definition, and had quite a bit of weight to the music. Also keep in mind (remembering about what I wrote above about allowing an audio device to be broken-in), when you switch Op Amps, as they warm up, their sound character will also change and usually for the better (meaning an increased warmth to the audio). So when you first insert an Op Amp in the U3, it may at first sound brighter, but don't let that dissuade you. Give it a few hours or up to 48 hours to be able to notice a discernible change in sound character. Be careful with op-amps though because if you insert it the wrong way (like backwards), you will immediately burn out/destroy the op-amp (not the unit). So before you do any op-amp rolling, PLEASE - be careful and know what you are doing. Given that, the op-amp that comes with the U3 is quite competent and musical sounding. Well, how about any negatives you may ask? Well, yes there is one (subjective) - and that is the front blue light which indicates on/off status of the U3, is rather large (and bright) when compared to the rest of the unit. It features an overly bright blue light which can light up a room at night (without exaggeration). When it's on, especially at night - and your sitting close to it such as by a desktop computer while listening to music - it can be extremely distracting because of its brightness. And when that light is "blue," somehow it becomes more pronounced. It would have been nice if Douk designed the light to be either red or green, which would have toned down the effect somewhat. So that's the only negative thing I can report really. I was so impressed with the U3 that I purchased a second one shortly after getting the first copy. Now when it comes to support - wow, are they good! After 4 months or so, one of my U3's developed a loud hum in the headphone jack. At first I thought it was the headphone I was using, but soon discovered that something happened with the U3. So here it was - June - and I contacted Douk via Amazon. They were quick to respond - didn't ask any questions - and sent me a new U3 in a jiffy manner. Now that's support to the maximum. So, based on its uncanny low price vs its ridiculously high performance ratio, I am enthusiastically rating the Douk Audio U3 mini head amp with 5 stars. It's just that good!!!!

Awesome amplifier, easily a thousand dollar sound selling for 2 figures, the signal to noise ratio is also extraordinarily impressive when powered by my power bank which is a DC power supply.

U3 تأدي الغرض و زيادة انا معاي سماعة ASH-50x و الصراحة الصوت معاه جبااار

El producto es de excelente calidad, construcción metálica muy robusta, viene sin cubo cargador, pero si te sobra uno ahí muy sencillo de 5 volts, 2 amperes, te va a funcionar perfecto. Tiene una luz LED que indica cuando está encendido. Tiene una potencia increíble, mi interfase con el nivel al 2. puede ser amplificada hasta que prácticamente la potencia de los audífonos llegue a superar un umbral sano. O sea, creo que amplifica muy bien y es muy silencioso, muy limpio, no añade ruido, corre perfecto cualquier audífono. Tengo unos Planer Magnetic que son pesados de correr y los corre con una potencia impresionante, además de que los hace funcionar con una claridad y detalle muy superior y notable a comparación cuando los conecto directamente a un teléfono. Definitivamente recomiendo este producto para correr cualquier audífono del mercado que requiera amplificación especial. Incluso si es un audífono de gama alta como los HD 600 u otros parecidos. Incluso para los Hi-Fi Man XS se los recomiendo. Yo tengo unos Hi-Fi Man HE 400 SE y bueno, estoy contentísimo con el producto.

I am really surprised by this U3 headphone amp made by Douk Audio. While this little guy may not be a very linear amp on paper or on the test scope, it sounds even with punchier bass and sweeter treble than most of my Topping and SMSL amps or the THX AAA amps for most music genres. Even better, the unit can be powered by a 5V USB charger (but certain power supply seems to make the U3 sound better without any background noise than others). Pairing it with a multi-port USB charger and choosing also other 5V powered audio equipment (e.g. the newer small Topping DACs like E30 or D50s), this will create a simple cabling solution and a space saver on the desktop. Best forty something bucks spent on audio equipment! My only complaint is a noticeable channel imbalance at the lowest POT volume setting, but this problem goes away after passing the first two knob clicks - not too bad a problem after all. One can even try doing some "opamp rolling". Putting in the different the MUSE and OPA opamps I have on hand to replace the stock NE5532 can give me effectively a headphone amp with completely different sound signatures. Also, this amp has enough oomph to drive any 32ohm to 600 ohm audiophile headphones with ease. What else can one ask for in this price range? I think I will get another unit : ) UPDATE: Douk Audio U3 + original Burr-Brown OPA2134P opamp + a multi-port USB charger (for low noise floor performance) + Fostex T50RPmk3 = sound better than a $1500+ audiophile-grade setup with HIFIMAN headphones UPDATE #2: The build quality is actually superb. For people who find the volume knob (POT) squeaky, please don't use WD40 or any lube as it will cause the plastic to break later. Just pull the metal volume POT a little bit put and don't insert it all the way in. Then it won't rub against the back and give you that squeak. UPDATE #3: Adding a TOPPING P50 to purify the AC power, you have the cleanest headphone amp on earth! WOW!