Douk Audio U3 Headphone Amps, Mini Hi-Fi Amplifier for Home Desktop PC 6.35mm / 3.5mm Headsets, Class A, RCA Input, DC 5V
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Availability:
In Stock.
Arrives
Sunday, Aug 30
Size: U3
Features
- Adopting innovative circuit design, DC 5-20V wide input working voltage, the amplifier circuit can always work at a high voltage of 26V, and the background noise index is excellent. With wide frequency response extension, excellent transient response, excellent purity and transparency, and good dynamic range.
- Adopting original TI-NE5532 classical op amp and transistor expanding current circuit, using 1300mA large current output transistor working in class A status, with ultra-low distortion, and the sound is warm and delicate, full and mellow.
- Pluggable op amp socket design, convenient to upgrade different op amps and bring much DIY fun and playability for audiophiles. Smooth and mellow sound, suitable for listening to vocals or string music, classic or pop music, and even with unique charm when playing rock.
- Mini size with exquisite appearance and most cost-effective, brings big surprise for all audiophiles, easily to drive most headphones in the market, providing larger power, better sound field and details, very suitable for home/office desltop audio system use.
- With strong drive power, easily to drive most high-impedance headphones such as: HD580/HD600/HD650/K701/K702/Q701/DT880/T70/T90/SR225/SR325/RS1e
Description
Make Hi-Fi Affordable Estabilshed in 2013, Douk Audio & Nobsound is created by a group of enthusiastic music fans and professional audio experts. We design and make various audio equipments including amplifier, phono preamp, headphone amp, DAC, audio switch and so on. Our aim is "Make Hi-Fi Affordable" ! Ampapa Q1 DAC | Bluetooth Headphone Amp Douk Audio G7 Flagship Amplifier Ampapa D1 Bluetooth Amplifier Douk Audio P7 Phono Preamplifier Douk Audio U2 PRO DDC 26V high voltage for clear, noise-free audio with high-impedance headphones like HD580/HD600/HD650 Delivers a warm, detailed sound, enhancing the listening experience. Customizable sound quality with the convenience of pluggable op amps. Small size with powerful performance, an affordable choice for audio enthusiasts. 1*U3 Headphone Amplifier; 1*USB to DC Cable; 1*6.35mm to 3.5mm Headphone Adapter Douk Audio U3 Douk Audio U5 Douk Audio U10 Nobsound E6 Douk Audio L1 Douk Audio P1 Douk Audio Q4
Manufacturer: Douk Audio
Maximum Supply Voltage: 20 volts_of_direct_current
Minimum Supply Voltage: 5 volts_of_direct_current
Mounting Type: Freestanding
Brand: Douk Audio
Maximum Supply Voltage: 20 volts_of_direct_current
Minimum Supply Voltage: 5 volts_of_direct_current
Mounting Type: Freestanding
Number of Channels: 2
Output Power: 1300 Milliwatts
Specification Met: FCC
Manufacturer: Douk Audio
Model: XZ-U3
Brand Name: Douk Audio
Item Weight: 5.92 ounces
Part Number: XZ-U3
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Sunday, Aug 30
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
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!!!!
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Reviewed in the United States on February 28, 2021 by Bernd W. Herrmann
I bought this amp to hook up to my Schiit Modius, in order to be a secondary amp that would mount to the bucket seat of my racing sim set up. I didn't want to have to span headphone cables across the room, and figured running RCA to my sim set up would be easier, and was originally planning on buying a Schiit Magni at bstock just to be frugal. I now have it directly attached to the side mount of my seat and I can take my Sennheiser HD660s from my desk to my sim rig without having to mess with the headphones and without too much loss in quality. My set up: Schiit Modius and Magnius running HD660s. The Douk is connected to the single ended out on my Modius, as the magnius is being used for headphones as well as the desk speakers I have. Sound: For $38, this thing is performing well above its price range. I have used one of the old cheap apple power cube bricks to power the amp, and so far I have not had any issues with noise or interference. I have the volume set to around 9 o clock position, and easily am getting plenty of power to the 150 Ohms Senns, with enough power to probably blow out my ears. Sound quality is very good especially coming from an amp plugged into a mid to high end DAC. One thing I have not tried is plugging the amp into a usb port for power, but based on past experience with tech like this, I would not recommend that in the first place. I know most people in this price range are looking for good power and clean signal, so if you do take the steps, you can easily achieve that. I will say, it is still early for me to give a good representation of sound in comparison to more common amps, but I will probably come back to update this review once I have had it for a bit. First impressions are that the sound is definitely not hindered in any way when given a good clean power source and signal. Build: Again, for $38, quality is phenomenal. I would be paying $100 plus for this quality any other day, but the price to performance makes this that much more worth it. The power button is solid and defined to use, and does not wiggle around in its casing. Volume knob is extremely nice, and the Volpot has small clicks for each level of volume, very satisfying. The materials used for the casing are great as well. The front panel appears to be more of a rose gold compared to the image which seems to make it look bronze orange ish. Finish on the front plate as well as the body are even and clean, and the unit I got did not appear to have any blemishes. 1/4 jack has presented no issues either. The unit comes with 4 stickon rubber feet, which on first glance made me think they were screw in. Since I was removing them to attach the amp to my sim frame, I could see they didn't cheap out on the small details like this. Features and Value: The things you can do with this amp will vary greatly depending on your creativity and need. I believe that for anything headphone related, assuming you are on a budget from $0 to $150, I would recommend this, as it does everything any other headphone amp does if you set it up properly. The blue light on the front of the unit is indeed bright, but I won't be leaving this amp on anyway, so it doesn't matter to me. Small things to consider: Make sure you give it good clean separate power NOT from a usb port on a computer. When powering off, you will here a fizz sound as the power drains out of the unit, I don't think this is any sort of issue, but if it develops into one, I will update the review accordingly. When you turn the unit on for the first time, make sure the volume is turned all the way down, or you will blow your ears or your headphones out. Or both, who knows. Conclusion: If you are on a budget and want the best amp you can buy under $40, get this. The unit is very capable and can be paired with a lot of different hardware to accommodate various use cases. I personally will probably buy a few of these in case they go out of stock. Office use, gifts to friends, similar things all seem to fit the U3 Mini extremely well.
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Reviewed in the United States on August 5, 2021 by Robbie Reyez
Great value desktop headphone amplifier and volume control for use with analog line-level audio output. If your computer only comes with a line-level or low-power headphone audio output, or if you have a line-level output DAC preamp for your speakers, this adapter will provide full power over the full range of output suitable even for high-impedance headphones. I use this to power Sennheiser 620S and 660S2 and get full-volume bass response. It is sturdy and well-built. The op-amp is socketed for those who want to tinker. NOTE a good quality USB-A power supply is NOT provided and is required to use the unit; an older Apple unit works for me, but I have had some buzz when I tried cheaper generic units.
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Reviewed in the United States on August 31, 2025 by Amazon Customer
I tried numerous other headphone amps that didn't work well for various reasons, including a different model from Douk. This one is a WINNER. It can get so loud it can make my ears ring. Low distortion too. I am using some big "Quantum 200" model JBL headphones (50 mm drivers) with an impedance of 32 ohms. It comes with an AC adapter that plugs into a 5.5/2.1mm power receptacle. I ordered a cable (from Amazon) with that plug on one end and a USB-A on the other end. I can plug this into my Ventev "Portable Battery" pack about the size of a cell phone with a USB-A output and run the amplifier on the battery pack. Works perfectly. It comes with an adapter from 1/4 inch to 3.5 mm. For whatever reason, the volume control has what they call "detents", but I actually like that because it keeps the volume knob from accidentally turning when I drop this into a fanny pack. I use the volume control on the headphones, so I just leave the Douk turned all the way up. It is very small and easily fits into the smallest size pack along with the battery pack. The price is definitely very reasonable. I'd gladly pay more. The only slight downside with this amp is that the input connection is a pair of "RCA" jacks. What were they thinking? I ordered an adapter from Amazon that converts these to a female 3.5mm jack. BTW, I happen to be an electrical engineer so I know what I am doing.
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Reviewed in the United States on July 11, 2026 by Richard Karlquist
This little headphone amp is impressive! Powering with an Apple 5.2V, 2.4A USB power supply/charger with the USB power cable included with the unit... It likes the amperage... Out of the box, and a few hours of burn-in, powering 32 Ohm headphones, the amp sounds great! ... I expect it to get better with more listening time/burn-in... You will find it is very revealing of the quality of your interconnects and I presume power-supply... The Apple power-supply/charger is fine for my applications, and the sound-quality elements of contextual dynamics, contextual harmonic texture contextual spatiality and noise-floor blackness are all very, very good, considering the price of admission for this amp in comparison to my much, much, more expensive HPA used in my primary headphone listening system, however, I may try a 9V or 16V supply to see if it likes a higher supply voltage. The volume control is stepped and somewhat coarse, sounding like approximately 1-2dB increments, and the Left and Right channel output is not balanced until around four (4) steps from minimum output on my unit, however, this not an issue for me in my application, and having a stepped-attenuator is a very nice feature, nonetheless. And the versatile operational power-supply voltage requirements make this little HPA quite portable and useable in a variety of audio monitoring/listening scenarios.
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Reviewed in the United States on October 27, 2021 by Sounder
Have had it over 4 months now, and it just works very well, even just off a 5v outlet to usb adapter. For some reason, audio out of a PS5 just doesn't quite get... loud enough. It's totally audible, but just not loud (like, explosions are... whelming), unless you plug your headphones directly into your tv/monitor, which then amplify the sound and it's just fine. But, if you want to frequently switch between monitor/tv speakers and your headphones, you'd be constantly plugging and unplugging the jack, which is unreasonably annoying to access on a constant basis, and just promotes wear. If the jack is plugged into a monitor/tv, the speakers are of course muted. PS5 just lets you switch over in settings between HDMI or USB (and yea, if you want wired, you'll need a usb to audio jack adapter). I c-o-u-l-d use Bluetooth as well, but I thoroughly despise Bluetooth. At least Playstation controllers just simply work with PS4/5 over Bluetooth with no issue whatsoever, for years. Not one issue. Any other device I've ever used on mac/pc/phone? Bluetooth a-l-w-a-y-s has issues. Going wired just has no issue, ever. I only use like a quarter of how far this amp can dial up, so for some applications, there's massive headroom. No glitchy sound, no fuzz, nothing, not even when turning the dial. If you have static, you probably need a ground loop noise isolator, which I do, and there's just nothing. Plug is quite snug too, with little play. Overall impressed, satisfied, and great for the value.
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Reviewed in the United States on April 18, 2025 by RUTH A SAUNDERS
The Douk U3 headphone amp is a very high quality device with excellent sound, design, and build quality. I'm using it to listen to a large collection of classic vinyl LPs with a very high quality turntable (Fluance RT85), Sennheiser HD 560S headphones and a Fosi Audio Box X1 MM phono preamp. I used to work in a very high end stereo store and this is quite a good setup. The Douk U3 has much more power than needed, but that's not a problem. As others have noted, the output stage operates in class A for modest power levels, and that's a good thing. The volume control works just as it should and it has tactile detents, making it easy to set to a known volume level without looking at it. Note that the Douk U3 does not include a power supply. That's OK. It works great with a USB power outlet on a power strip. No noise, no hum, more power than you need. You do not need a higher voltage power source. This unit comes with a power cord with a USB connector on one end and a round power plug on the Douk end. Connecting to USB power is trivial. If you wanted to connect to a higher voltage source that would require modifying the cable or making a special adapter. Some reviewers have mentioned that USB jacks on computer may introduce noise. I haven't tried that, and I wouldn't use it that way anyway. You might wonder why I have both the Fosi phono preamp and the Douk U3 headphone amp. Well, the Douk 3 does not include a phono preamp function. I wish it did. If they make a new one model that includes an MM phono preamp I would buy it. You need an RIAA equalized phono preamp to play vinyl. The Fosi phono preamp serves that purpose. It does have a headphone output, but it doesn't have a volume control, rendering the headphone output useless. It's too loud with the Sennheisers, and way too loud with lower priced headphones. Some headphones have their own volume controls, but the ones I've tried have poor sound quality. So, I need both the Douk U3 and the Fosi Box X1.
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Reviewed in the United States on September 11, 2022 by Paul Goodman
Bottom line: with some effort, this headphone amplifier is fun to play with and roll op amps through. But, before you get to have fun, you need to have a dead quiet power supply. I wish the PSRR (Power Supply Rejection Ratio) was published. This amplifier will amplify everything, including any hum or hiss your power supply lets through. Don't bother trying to power this from your computer's USB ports; both hum and hiss will be very audible. Even with a name brand well regulated USB power supply, hiss will be audible. If you know what defects to listen for, you will hear them. If you don't know what to listen for, you will hear them also, you just won't know what the name of the noise is. I have found that when this is Headphone Amp is hooked up to a dead quiet power supply, it is enjoyable. Subtle differences can be heard in different op amps. The op amp socket makes rolling a breeze. Unfortunately, the only PSU that I have found to be quiet enough to enjoy this amps extreme sensitivity has been a sealed lead acid 12 volt 12 amp hour battery. This is probably not a viable solution for most users, but it will provide a very "black" background free of noise. I would also love to know the gain of the op amp circuit, as some of my more favorite op amps are not unity gain stable. Along with rolling op amps, I also changed out all of the stock JWCO capacitors for some Nichicon and Elna counterparts. I can't attest to any "auditory revelations" from doing this, but I did not put much time into trying to listen too hard for a good before and after reference. I do trust Nichicon and Elna, and while I haven't personally had a bad experience with JWCO capacitors, I have read of many. Besides, desoldering can be a great form of zen meditation. All in all, this little amp is a good (to almost great) value for what it is. But if you are seeking a sublime critical listening experience, prepare to put some effort in.
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Reviewed in the United States on May 4, 2022 by RocketManCS2