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Douk Audio

Douk Audio A5 2 Channel TPA3255 Stereo Amp, 300 Watts x2 Mini Hi-Fi Audio Power Amplifier Class D for Home Theater System, Passive Bookshelf Tower Speakers with High-Pass Filter + 32V Power Supply

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$89.99
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At a glance

Condition
New
Model
A5-32V
Dimensions
5.12 x 1.3 x 4.02 in
Weight
1.1 lb
Material
Aluminum
Voltage
32 V DC
Maximum Supply Voltage
48 V DC
In the box
1 * A5 Amplifier1 * DC 32V/5A Power Adapter1 * User Manual

Features 5

  • HiFi Sound with Adjustable High-Pass Filter: This TPA3255 amplifier features an adjustable high-pass filter (HPF) 30-200Hz to refine mid-high frequencies while minimizing low-frequency interference. Perfect for bookshelf or passive speakers, it enhances clarity and creates a dynamic soundstage ideal for home stereo and theater audio systems.
  • Easy Customization with Plug-and-Play Op-Amps: Upgrade your sound effortlessly! Douk Audio A5 includes a tempered glass access panel for quick op-amp replacements, allowing audiophiles to tailor sound profiles without disassembling the unit.
  • PFFB Technology and High-Performance PCB: Built with Post-Filter Feedback technology circuit and a 4-layer immersion gold PCB, this digital amplifier reduces distortion and improves frequency response. Enjoy unparalleled audio precision, enhanced signal integrity, and effective heat management.
  • Stunning Design for Living Rooms and Studios: Sleek and modern, the compact power amp is equipped with a transparent panel and adjustable internal LED lighting. Multiple color options create a futuristic look, adding sophistication to your home audio setup or studio.

Description

TPA3255 | High-Pass Filter | Op-Amp Rolling | PFFB | Glass Panel Adjustable 30Hz-200Hz high-pass filter for precise bass control and improved sound quality. Supports NE5532 op-amp replacement with models like 2134 or 2604 for personalized audio tuning. Equipped with a tempered glass cover, showcasing internal components with elegance and durability. Built-in soft blue ambient light creates a high-tech vibe while enhancing visual comfort. Powered by TI’s TPA3255 chip, delivering 300W per channel to drive various speaker types. Utilizes PFFB (Pure Feed-Forward) technology to minimize distortion and improve dynamic sound. High-precision 4-layer PCB design ensures stable signal transmission and efficient heat management. Optimized heat sink and structure design ensure stable operation during extended use. Features high-quality internal components for reliable performance and high-fidelity sound output. This version adopts 32V 5A power supply. Douk Audio A5 (32V) Douk Audio A5PRO (32V) Douk Audio M1 PRO Douk Audio ST-01 PRO Douk Audio Q11 Douk Audio P1 PLUS Douk Audio VU3 PRO 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

Specs 20

Item dimensions L x W x H 5.12 x 1.3 x 4.02 inches
Voltage 32 V DC
Manufacturer Douk Audio
Maximum Supply Voltage 48 V DC
Minimum Supply Voltage 24 V DC
Mounting Type Freestanding
Number of Channels 2
Output Power 600 watts

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If you place your order now, the estimated arrival date for this product is: Wednesday, Nov 4

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Similar Products

Top Amazon Reviews

Excellent Audio at a Bargain Price
Model: A5-32V
Review Image by Marco
Review Image by Marco
At a time when affordability is a major concern, it’s refreshing to find a bargain like the Douk Audio A5. Texas Instruments’ TPA3255 amplifier chip has helped companies like Douk, Aiyima, and Fosi deliver powerful, excellent-sounding Class D mini amplifiers at remarkably low prices. I’ve owned amps from all three manufacturers and have had excellent results. I haven’t felt the need to swap op-amps: the added expense can undermine the value of an inexpensive amplifier, and I’ve been very happy with the sound of the stock components. I use the A5 in a 2.2-channel setup in my 12-by-12-foot home office, primarily to enjoy recordings stored on my music server. My collection includes recordings sampled at 48–96 kHz, played through a pair of SVS Prime Satellites and two SVS SB12-NSD powered subwoofers. The A5’s high-pass filter is set to 80 Hz, leaving the deepest bass to the subs. The streamed audio goes from one of my servers to a Topping DX3 Pro DAC then to the A5. If you want a super clean audio signal, this is the way to do it. I couldn’t be happier with the sound. The background is silent to my ears, allowing the music to emerge with clarity, authority, and impact. I don’t listen at extreme volumes, but the bass is full-bodied and the highs are crystal clear. With the powered subs handling the low bass, the A5 seems to coast through its duties, and the included 36V power supply has been sufficient for my listening levels. The case gets warm to the touch during use. The A5 feels solid and well constructed. If it holds up as well as my other mini amplifiers, I expect to enjoy it for years. Given how far Class D amplification has come, I may eventually make the switch in my 11.2-channel home theater, too. For my office system, this little amp delivers everything I hoped for at a very reasonable price. ... show more
Reviewed in the United States on October 23, 2026 by Marco
Sound impressions, comparisons, and op-amp rolling results
Model: A5-32V
I will spare the specs and features of this amp, as you can read them yourself, and focus on what you came here for: how does it sound? [UPDATE: just went through various op amps and the SX52B discrete opamp is by far the best. These are about $14 each on ali*xpress and will transform the A5 into the next level. SparkOS SS3602 are also excellent, but these are almost double the amp's price, and the SX53B's get you there for a fraction of the cost. For a total of $128 ($99 for amp and $24 for op amps) this is an unbelievable setup.] Compared to other impressive Class-D amps coming out of China (Aiyima, Fosi, etc) this one is among the best. Very open and detailed, if a tad analytical (a common characteristic for Class-D amps) but below I discuss how this can be improved. The default configuration is crisp, clean, and very detailed. I focus on acoustic jazz, symphonic/chamber music, and opera, so for me midrange purity, soundstage, and imaging are critical. The soundstage here is excellent-- a bit narrow vertically, but very good imagining and placement otherwise. This is a very, very good amp, period. I have compared this with Aiyima A07, and the A07 max, which also use the TI-5532 op-amp and provide a socket for trying out other flavors. While these amps have similar sound characteristics, the Douk Audio A5, has the advantage of a high-pass filter, a slightly better design circuitry, and an easily accessible op-amp socket via the removable glass (acrylic) cover. I did not care as much for the A07 max (sounded a bit thin to me) and this unit and the original A07 sound much more similar to the A5. I tried upgrading this with various op amps, with mixed results. The LM4562 and OP275 chips seemed to create some muddiness in the midrange (particularly in orchestral passages) that did not sound right; the MUSES02 chip diminished much of the treble region, seeming to remove the delicately brushed cymbals from jazz trios altogether. I have yet to test out the SparkOS SS3602 on this, but so far this unit has not played very nice with alternate op-amps. My favorite at this moment is the original 5532 that it came with. Which is to say, it sounds excellent. To bring back some of the warmth missing from Class-D amps, rather than swapping op-amps, the best bang-for-your-buck upgrade is a tube buffer. When I coupled the stock A5 with a $35 tube buffer (FX-Audio Tube 01) and two JAN 5654W tubes ($20) it took everything to the next level. I would put this up against my much more expensive audiophile amps. So, in short, get this amp. Most can listen to it as is and get much pleasure and enjoyment out of it. If you are itching to follow an upgrade path, spend $55+ in a tube buffer/preamp and see if that does it for you. The quality this amp provides is simply amazing for its price. ... show more
Reviewed in the United States on February 8, 2025 by Pozo
Bargain of the Century!
Model: A5-32V
The Douk Audio A5 is my first foray into the intriguing new landscape of small class D amplifiers from China. As someone who got into "hi-fi" in the 1970s, I have always equated amplifier power with amplifier weight and size. Beefy power required heavy massive amplifiers. It was just an inarguable fact. Seeing the recent proliferation of these toy sized amplifiers definitely piqued my curiosity about whether these things could seriously be considered to be in the same league as traditional audiophile amps. I recently bought a pair of Elac Carina BS243.4 bookshelf speakers and found them to be power hungry. I had been using a Monoprice Pure Tube amp to drive them but the 10 watts per channel was insufficient to drive these speakers with any authority. I was looking for some additional clean power to be fed by the Monoprice amp (Love the sound of this amp!) working as a preamplifier, and wondered about one of these amps from Aiyima, Fosi, and Douk, etc. While I know the power ratings on these units are exaggerated, I was impressed with the measurements and reviews I saw online. With this Douk A5 on sale for only $85, I figured it was worth a shot. To say I was blown away by the sound of this amplifier is a huge understatement. The performance is incredible regardless of the price. When taking the price into account, it is truly absurd! In addition to the plentiful power, it managed to preserve the holographic imaging and soundstage of the Monoprice Tube amp. I remember reading some reviews that compared the Douk A5 favorably to multi-thousand dollar amplifiers, and thinking "Aw come on, that is ridiculous". Well I have now been thoroughly enlightened! I think there is a generational paradigm shift underway in the area of home audio amplifiers to the great benefit of audiophile consumers. These tiny class D amps with PFFB technology are the real deal! The only downside I can think of is the appearance of these amps are so cheap and toy like. You are not going to impress anyone with the looks of these as compared to a large, heavy, fancy, stylish, conventional class AB or class A amplifier. But how much are you willing to pay to impress people? I had ordered this with a standard 32V power supply and was curious what the performance increase would be like with the 48V power supply. So I ordered one. Performance was definitely raised a notch with more controlled and robust bass. I could really crank up the sound with the 48V power supply (71 watts @ 6 ohms -> 110 watts @ 6 ohms). However it makes the amp run HOT as the chassis serves as the heat sink. I removed the glass panel on top and replaced it with a piece of steel mesh but it is still very hot. Hopefully this does not affect the lifespan of the unit. Bottom line -This amp is a mind blowing value. As I listen to my system while I type this review, I am still having trouble reconciling the incredible sound I am hearing - with visual disconnect of seeing this tiny little unit being responsible for it. ... show more
Reviewed in the United States on June 13, 2025 by Happy audiophile
Focused and Flexible Amp
Model: A5-32V
I have become something of an unintentional Chi-Fi hobbyist, with a growing collection of compact audio gear from Fosi Audio, Aiyima, Douk, Topping, SMSL, WiiM, and others. This little amplifier caught my attention because of two features that are not always found at this price point: the high-pass filter and the inclusion of PFFB (Post Filter Feedback). I was curious whether those design choices would make an audible difference. I am using it in my office system with a WiiM Ultra streamer/preamp, Topping E50 DAC, Sony SS-CS5 speakers, and a Yamaha powered subwoofer. The included 32V power supply is more than sufficient for this application, and the overall sound quality is excellent—clean, controlled, and far beyond what I would expect from such a compact and affordable amplifier. The high-pass filter is a genuinely useful feature, especially for systems with fewer configuration options—such as a dorm room setup or a simple desktop system—or for speakers whose impedance characteristics become challenging at higher volumes. It provides additional flexibility and can help optimize the integration of a subwoofer and smaller speakers. That said, even if you never use the extra features, this amplifier is still an outstanding value. The combination of build quality, functionality, and sound performance makes it an easy recommendation at this price point. ... show more
Reviewed in the United States on July 1, 2026 by RJHJR
Almost
Model: A5-32V
Nice little amp but it just can’t run 48v battery even when it say you can. Sounds great but gets way too hot for my liking with 48v. It sounds nice with the stock 32v battery but 48v takes all these mini amps to the next level. Had to send it back and reconnect the old trusty A07.
Reviewed in the United States on May 15, 2026 by JB3
This is a great little amp!
Model: A5-32V
I purchased and received a Douk Audio A5 from Amazon a few weeks ago. It is a nice little amp. I purchased it for speaker testing purposes (I got tired of lugging around my bigger class AB amps) and to run my little PA speakers every now and then (ditto). I've been listening to it for some time now and it seems like a solid little amp. Pretty tight bass too. And I did have my doubts about it, but that variable high-pass filter has turned out to be very useful. At no time did I feel the need to use a more powerful PSU with the A5. Additional plus - you can use dual banana plugs with the A5. You just need to wire them up differently. Use one across the positive terminals, and the other across the negative terminals. Of course, that could have been avoided if the output terminals were arranged (+ - / + - ) rather than (+ + / - - ), so I guess that's peeve #4, LOL. I purchased and received an Douk Audio A5 from Amazon a few days. Nice little amp. Purchased it for testing purposes and to run my little PA speakers every now and then. I've been listening to it for some time now and it seems like a solid little amp. Pretty tight bass too. And although I did have some initial doubts about it, the variable high-pass filter has turned out to be very useful. Note: My test speakers are a pair of DIY ones I put together a few years ago. They're rather insensitive (designed for nearfield use), and at no time did I feel the need to use a more powerful PSU with the A5. The Fb for the speakers is around 50 Hz, so I set the HP filter below that, basically by turning it up until the bass started to noticeably reduce in volume, then turning it back down slightly. My only peeves so far are: (1) 32V PSU is the only option offered for it off of Amazon, (2) The clear acrylic top cover can't be fastened into place (which means I'll have to rig up something - until that happens I've left the peel-off sticker in place), (3) the volume control knob is basically useless until rotated past the 9 o'clock position. Additional plus - you can use dual banana plugs with the A5! You just need to wire them up differently. Use one across the positive terminals, and the other across the negative terminals. Of course, that could have been avoided if the output terminals were arranged (+ - / + - ) rather than (+ + / - - ), so I guess that's peeve #4, LOL. Now, is Douk Audio going to produce a companion subwoofer amplifier to match the A5? Basically, the A5 with an adjustable low-pass filter instead? Or, even better, with adjustable low-pass and high-pass filters :). I'd immediately place something like very high on my purchase list. ... show more
Reviewed in the United States on March 18, 2025 by Brian Steele
Great value in a high quality, low cost chi-fi audio
Model: A5-32V
Set-up: PC USB > S.M.S.L. SU-1 DAC > Douk Audio A5 amp > Vera-Fi Audio Vanguard Scout speakers Application: PC speakers, including Amazon Ultra music streaming The speakers run $300 a pair, when you can get them. They sound great, if a bit warm, and come beautifully finished in real cherry wood veneer. The DAC is $85, the Douk Audio A5 amp is $76. Add maybe $30 for decent RCA and banana plug speaker wires and you have a fantastic little system for a total system cost under $500. You could probably spend $150 on a pretty good pair of speakers and still have a nice sounding system for near-field listeningfor a total of around $350. The little Douk amp puts out plenty of power. It can drive the Scouts with their 84.5db efficiency rating to well over 90 dB at 3 - 4 feet The combination of the Douk Audio A5 and the S.M.S.L. SU-1 produces a clean, punchy sound. Some have reported that the A5 leans toward analytical, which is a perfect complement to the fairly warm Scouts. The result is sound that is rich, yet detailed with great sonic imaging with nice instrument separation and a very wide sound stage. You won't mistake this rig for a $5,000 system, but your banker and your spouse will be much happier with this setup. Or maybe you already have a $5,000 system in your den and need a small system for your home office. Either way, this setup deserves consideration. Your results will, of course, depend on the source material. So far I have auditioned The Eagles Hotel California album ,The Doors LA Woman, and Paul Simon's Graceland. All are beautifully produced and engineered albums and all sounded lively and clean, but not overly analytical. Full Disclosure: I have hearing loss that rolls off quickly starting around 5kHz so there may be sibilance and other artifacts I can't detect. As always, YMMV. But frankly this Douk/SMSL/Scout setup is, to my ears at least, the bargain of the century. ... show more
Reviewed in the United States on May 8, 2026 by Michael R Young
Includes post-filter feedback (PFFB), high pass and variable level aux output
Model: A5-32V
I found the sound of the Douk Audio A5 stereo amplifier to be natural sounding and dynamic. Although not noted in the provided product documentation, my understanding is that the Douk Audio A5 amplifier features post filter feedback (PFFB) for improved sound. PFFB can result in an amplifier achieving overall flatter frequency response that is less affected by speaker impedance changes across the audio spectrum. The right knob is the volume control. This control doubles as the power switch. There is no power indicator LED on the front panel of the A5. There are 3 multi-segment LEDs inside the A5 amplifier. These LEDs can be configured via dip switches located inside the unit to provide Red, Green or Blue illumination (or any combination of these three colors) to the inside of the A5 amplifier. There is a clear insert in the top cover of the A5 that can be easily removed to access the dip switches and the A5's other circuitry. There are two swappable op amps inside the A5 amplifier that can be changed if desired. On the rear of the A5 there is a 3.5mm output connection labeled Aux Out. I confirmed that the A5's Aux Out level is variable, full frequency. (Douk Audio could have labeled the 3.5mm connection as Pre Out or Sub Out.) The Aux Out level is controlled by the volume knob setting on the A5. The left knob on the front of the A5 lets you activate and adjust the high-pass filter. When switched on, the high-pass filter can be set anywhere between 30Hz and 200Hz. (Note that there are no conventional bass or treble tone controls on the A5.) The high-pass filter only affects the speaker level outputs and has no effect on the Aux Out's audio. Even without a subwoofer the A5's high-pass filter can be useful if you desire to roll off the lowest bass frequencies that are sent to the speakers. The A5 comes with a Douk/Nob Sound branded power supply rated at 32 volts and 5 amps. The included A5 documentation states the A5 is capable of 300 Watts x 2 @ 4 ohms. With the stock 32V/5A power supply I estimate the A5 is able to deliver ~50 Watts per channel output @ 8 ohms. You can substitute a 48 volt, 10 amp power supply so that the A5 would be able to deliver its maximum power. The case of the A5 amplifier, when used with the stock 32 volt power supply, runs about the same temperature as the Aiyima A07 Max with that amplifier's stock 36V/6A power supply. The A5's case temperature reading was ~82F, in standby and 90F when in use. In comparison, the Fosi Audio TB10D amplifier's case measured 72F, in standby and in use. [Update: I measured the standby power consumption of the A5 amplifier. Plugged in, not switched on, the power consumption measured 0.3 Watt. Powered on, no input signal, 4.7 Watts.] [Update 6/17/25: I like the Douk Audio A5 amplifier enough that I just purchased a second A5 amplifier while it was on sale. The A5 is one of a collection of Class D amplifiers I keep in rotation for use with different 8 ohm, 6 ohm and 4 ohm speakers (new and vintage models). Not every amplifier pairs well with every model of loudspeaker. Sometimes it is a lack of power that prevents the amplifier from bringing out the best in the speaker. Else there are a multitude of other reasons including the amplifier having a too low damping factor, speaker impedance variations and crossover interaction. Many times new speakers need time (~40 hours or more) to break in to sound their best. Amplifiers also may need time before the power supply and filter capacitors fully form for best sound. Before swapping op amps, try swapping amplifiers. The other Class D amplifiers were each purchased on Amazon: Fosi Audio TB10D (has been compatible with every 8/6/4 ohm speaker I have tried); Aiyima A07 Max (in both stereo and mono mode, the A07 Max is small but powerful with 3dB or more headroom than the A5 or TB10D); WiiM Amp (weak WiFi performance, good sound with adequate power for most speakers and rooms, just so so soundstage and imaging) , WiiM Amp Pro (better WiFi performance, flatter frequency response, better soundstage and imaging than WiiM Amp, WiiM Vibelink Amp (the most powerful WiiM amplifier (to date), flat frequency response with good sound stage and imaging (similar to WiiM Amp Pro but with more available power, headroom.) I enjoy listening to the Douk A5 amplifier powering the Saiyin DS6700M small bookshelf speakers; a 2-Way Passive Speaker; 3.5" Woofer & Silk Horn Tweeter that are sold on Amazon. See my separate review of the Saiyin DS6700M speakers.] ... show more
Reviewed in the United States on March 5, 2025 by M. Meltzer
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