Douk Audio Class D Amplifiers Compared: Q10, A5 PRO, NS-13G MAX, NS-14G PRO and G7
Five class D amps from $36.99 to $299.99 on one set of store terms: 30-day returns, approval first. The Q10's price leaves out the supply; the A5 PRO lists 78W+78W at 4Ω on its supply against a 300W x 2 headline.
This page compares five class D stereo amplifiers sold on doukaudio.com: the Nobsound Q10, a mini amp with an optical input; the Douk Audio A5 PRO, with Bluetooth and a headphone output; the NS-13G MAX, with a turntable input; the NS-14G PRO, a 2.1 amp (a stereo pair plus a subwoofer); and the G7, an AC-powered amp with a built-in power supply and balanced inputs. They cost $36.99 to $299.99, as priced on October 26, 2026, and each price is for the option its summary names. Douk Audio, Nobsound and Ampapa are brand names sold by the same store and seller: the store's contact page says the site is run by Shenzhen Anba Technology Co., Ltd (Shenzhen, China) and HONGKONG LONGSHENG Import and Export Trading Co., Limited (Hong Kong). We have published 30 stereo amplifier reviews for this store, and most of them name a class D chip, such as the TPA3255, TPA3116 or TPA3221. Other amps in that group include the A5 at $89.99 with a 32V/5A supply, the ST-01 PLUS at $99.99 without a supply and the Ampapa D1 at $199.99 with a 48V/5A adapter.
Read the option and the power figure before you compare prices. The Q10's $36.99 is its Without Power Supply option (With Power Supply is $47.99), and the A5 PRO's $114.99 is its With 32V/5A Power Adapter option (the 48V/5A option is $134.99). The NS-13G MAX at $114.99 and the NS-14G PRO at $134.99 come with a 48V/5A adapter and have no option without one, and the G7 builds a 48V/10A supply into the amp. Listed power needs the same care. The A5 PRO page headlines up to 300W x 2 at 4Ω (a 4-ohm speaker load), yet its table lists 78W+78W at 4Ω on a 32V/5A adapter and 120W+120W on a 48V/5A one; the NS-14G PRO's table lists 120W+120W plus 270W for the subwoofer at 4Ω on its 48V/5A adapter; the NS-13G MAX page headlines 'Max Output Power: 600W(300W*2)', and its store description lists 120W+120W at 4Ω on its 48V/5A adapter. The Q10 page gives up to 100W + 100W with no load, supply voltage or current, and the G7 page gives 300W x 2 or 150W x 4 at 4Ω and also says it 'sustains 480W continuous clean power'; its store description also shows a power output table as an image, captioned 'The power specifications are estimated values. Actual performance may vary based on usage conditions.' None of the five pages gives the power level and load behind its distortion (THD+N) and signal-to-noise (SNR) figures, so read all of them as the store's claims.
Returns are the part of Douk Audio's terms to read twice. The return page, read on October 25, 2026, says to ask within 30 days of delivery and wait for approval before sending anything; an approved return has to ship within 7 days. Items need all packaging and accessories and no excessive wear, or the store can refuse them or refund part of the price. Refunds go to the original payment method after inspection, but original and expedited shipping, duties, taxes and customs charges are not refunded unless the law requires it or the store made the error. The return page does not say who pays return postage, and an older refund page still online excludes mistaken orders and change-of-mind returns from free after-sale service. Ask the store in writing (support is by email at [email protected]) who pays before you send anything back.
The current shipping page says orders are generally processed no later than the next business day and arrive in 2-8 business days, with duties, taxes and customs fees included in the checkout price unless noted otherwise. An older shipping page still online says airmail takes 10-25 days for parcels under 2 kg, DHL, UPS or FedEx 5-8 days above that, and that the store is not responsible for import duties, so check the delivery estimate and any duties at checkout. The warranty page gives 24 months from purchase for manufacturing defects, with free repair, a replacement unit and free shipping both ways for covered repairs; drops, liquid, DIY repairs, lightning, extreme temperatures and misuse are excluded (partial fees may apply), damage from weak packing on the way back may not be covered, and the older refund page still says 1 year. Each of the five product pages shows Free Shipping, 2-8 Days Arrival, 30-Day Return and 2-Year Warranty badges near the price; the policy pages add the conditions above. These terms cover orders placed on doukaudio.com; other sellers apply their own.
At a glance
| Pick | Price | Chip and listed power | Inputs | Outputs and controls | Supply at this price | Size and weight | Where to buy |
|---|---|---|---|---|---|---|---|
| Mini amp with an optical inputNobsound Q10 Bluetooth Amplifier 100W | $36.99 | TPA3221; up to 100W + 100W, no load stated | Bluetooth 5.0, 3.5mm AUX, optical | Banana speaker jacks; one knob for power, input, volume | None at $36.99; $47.99 with a supply | 77 x 22 x 62mm as printed; 116g | Check price at Douk Audio |
| Bluetooth and a headphone outputDouk Audio A5 PRO TPA3255 Bluetooth Amplifier | $114.99 | TPA3255; 300W x 2 headline; 78W+78W at 4Ω on 32V/5A | Bluetooth 5.1 (no codecs listed), stereo RCA | Banana jacks, AUX out, headphone out (500mW at 32Ω); bass, treble ±6dB | 32V/5A adapter at $114.99; 48V/5A is $134.99 | 130 x 112 x 33mm; 525g | Check price at Douk Audio |
| Turntable input, 48V/5A adapter in the boxDouk Audio NS-13G MAX Amplifier with Phono | $114.99 | TPA3255; 300W x 2 (4Ω); 120W+120W at 4Ω on 48V/5A (store description) | Stereo RCA, MM phono (5mV) | Banana jacks, AUX out (2.4V); tone/bypass switch, ±6dB | 48V/5A adapter included; no option without it | 130 x 102 x 38mm; 513g | Check price at Douk Audio |
| 2.1 amp with a separate subwoofer channelDouk Audio NS-14G PRO TPA3255 Amplifier | $134.99 | 2 x TPA3255; 300W x 2 + 300W sub; 120W+120W, 270W at 4Ω on 48V/5A | Bluetooth (aptX HD, aptX LL, aptX, AAC, SBC), RCA, AUX | Banana jacks, AUX and subwoofer out; sub cutoff 50Hz-220Hz, ±4dB gain | 48V/5A adapter included; no option without it | 155 x 125 x 42mm; 768g | Check price at Douk Audio |
| Built-in supply, balanced inputs, two speaker setsDouk Audio G7 2.0/4.0 Channel Digital Amplifier | $299.99 | 2 x TPA3255; 300W x 2 or 150W x 4 at 4Ω (2- or 4-channel mode) | RCA and balanced XLR+TRS combo ('2 groups' listed) | 2 banana speaker sets; ±10dB tone, bypass, VU meters, remote | Built in: 48V/10A, AC 100-240V; power cord | 275 x 190 x 78mm; 3.34kg | Check price at Douk Audio |
1. Mini amp with an optical input
Nobsound Q10 Bluetooth Amplifier 100W
A palm-sized TPA3221 amp. $36.99 is the Without Power Supply option, so you bring a DC 9-24V supply; With Power Supply is $47.99. The page gives up to 100W + 100W with no load, supply voltage or current, and lists THD below 0.001% and SNR above 89dB, neither with test conditions. Bluetooth 5.0 is claimed to reach 50ft and no codecs are listed. Its size prints as 77*22*62mm but the inch figures match 77*62*22mm. AUX, RCA and optical cables are in the box.
- Best for
- Anyone building a compact desk or bookshelf system who wants a cheap, flexible mini amp with Bluetooth, AUX and optical inputs.
- Skip if
- You want a power adapter included at the base price, or you need a headphone output.
2. Bluetooth and a headphone output
Douk Audio A5 PRO TPA3255 Bluetooth Amplifier
A compact TPA3255 amp with Bluetooth 5.1 and a headphone output rated 500mW at 32Ω for 16-600Ω headphones. $114.99 is the With 32V/5A Power Adapter option; the 48V/5A option is $134.99. The page headlines up to 300W x 2 at 4Ω, but its table lists 78W+78W at 4Ω on 32V/5A and 120W+120W on 48V/5A; the 250W+250W row needs a 48V/10A supply the page does not offer. Its speaker, AUX and headphone outputs play together on one volume and tone setting.
- Best for
- Desktop and living-room listeners who want Bluetooth convenience, real speaker power and a headphone jack in one small box.
- Skip if
- You need phono, optical or USB inputs, or independent control of the speaker, AUX and headphone outputs.
3. Turntable input, 48V/5A adapter in the box
Douk Audio NS-13G MAX Amplifier with Phono
A TPA3255 amp with a built-in MM phono stage for moving-magnet cartridges (5mV; the page lists MM only) at $114.99 with a 48V/5A adapter, its only adapter option. The page headlines 300W x 2 at 4Ω and 'Max Output Power: 600W(300W*2)', but 48V x 5A is 240W (our review's arithmetic); the store's product description, not the page text, lists 120W+120W at 4Ω on that adapter. THD+N 0.005% at 1kHz and SNR 107dB or better have no power level or load. At the same $114.99, the A5 PRO comes with a 32V/5A adapter and trades the phono input for Bluetooth 5.1 and a headphone output.
- Best for
- Turntable owners who want a compact amp with a built-in phono stage and enough power for real speakers.
- Skip if
- You use a moving-coil cartridge, or you need Bluetooth, digital inputs or a headphone jack.
4. 2.1 amp with a separate subwoofer channel
Douk Audio NS-14G PRO TPA3255 Amplifier
A 2.1 amp at $134.99 with a 48V/5A adapter in the box; the page offers no option without it. It has two TPA3255 chips, a separate subwoofer channel (2-8Ω, 50Hz-220Hz cutoff, ±4dB gain) and Bluetooth with aptX HD. The page headlines 300W per L/R channel plus 300W for the subwoofer, but its table lists 120W+120W and 270W at 4Ω on the supplied adapter; the 250W+250W row needs a 48V/10A supply it does not offer. A second power socket needs a same-voltage supply that is not included.
- Best for
- Anyone building a 2.1 setup with passive speakers and a subwoofer who wants Bluetooth and plenty of power in one amp.
- Skip if
- You need a headphone jack or wired digital inputs - this amp offers Bluetooth, RCA and AUX only.
5. Built-in supply, balanced inputs, two speaker sets
Douk Audio G7 2.0/4.0 Channel Digital Amplifier
An AC-powered amp with two TPA3255 chips and a built-in 48V/10A supply (AC 100-240V, power cord, no adapter). $299.99 is the price for the US, UK, EU and AU options; the China option is $349.99. The page lists 300W x 2 at 4Ω, or 150W x 4 at 4Ω+4Ω in 4-channel mode, and also says it 'sustains 480W continuous clean power'; its store description adds a power output table as an image, captioned 'estimated values'. THD+N 0.002% and SNR 112dB or better come with no test conditions. Inputs are listed as '2 groups of RCA/TRS+XLR combo input'; two speaker sets can be switched or run together.
- Best for
- Driving two speaker pairs from one amp — A/B comparisons, dual zones, or a high-power 2.0/4.0 setup fed by a quality DAC or streamer
- Skip if
- You want adjustable VU lighting, or you plan to lean on Bypass mode without controlling the source volume first
How we compared
We compared these amplifiers from the store's product pages, as summarized in our full review of each, and from Douk Audio's shipping, return, refund and warranty pages and its contact page, all read on October 25, 2026. We have not listened to, measured or handled these amplifiers: every power, distortion, noise, size and weight figure is the page's own, and none of the five reviews cites an independent test. The picks come from the 30 stereo amplifier reviews we have published for this store, and each was in stock at the store check of October 26, 2026.
Where a listing or the store's own pages disagree, this page says so. The main cases: the A5 PRO's 300W x 2 headline against a table that lists 78W+78W on its 32V/5A adapter, and its packing list marking both adapters 'Optional' while the store's product description lists a 32V/5A adapter without that mark; the NS-14G PRO's 300W-per-channel headline against 120W+120W, and its ventilation claim against two customer reviews on the store's page that report heat; the NS-13G MAX's 'Max Output Power: 600W(300W*2)' against a 48V/5A adapter that our review works out as 240W (48V x 5A), and a page title that says Douk Audio above a heading that says Nobsound; the G7's 300W x 2 or 150W x 4 beside a line that it 'sustains 480W continuous clean power'; the Q10's size, printed as 77*22*62mm beside inch figures that match 77*62*22mm; the store's current shipping page (2-8 business days, duties included) against an older page (airmail 10-25 days, no responsibility for import duties); and its 24-month warranty page against an older refund page that still says 1 year. The picks are labeled by need, not ranked against each other; each price comes from the pick's review and was last checked on the date shown beside it.
Each pick links to its full review and the sources behind it. How we research
Questions before you buy
Do these class D amplifiers come with a power supply?
Four of the five do at the prices shown. The Q10's $36.99 leaves it out ($47.99 with one), the A5 PRO's $114.99 includes a 32V/5A adapter ($134.99 with 48V/5A), the NS-13G MAX's $114.99 and the NS-14G PRO's $134.99 include a 48V/5A adapter, and the G7's $299.99 buys a built-in 48V/10A supply. Several of the other stereo amplifier reviews on this store price their cheaper option without one, so compare prices only for the same option.
How many watts do these amplifiers list, and on which supply?
As listed: the A5 PRO headlines up to 300W x 2 at 4Ω, and its table gives 78W+78W on 32V/5A and 120W+120W on 48V/5A. The NS-14G PRO headlines 300W per channel plus 300W for the subwoofer; its table gives 120W+120W and a 270W subwoofer at 4Ω on 48V/5A. The NS-13G MAX headlines 'Max Output Power: 600W(300W*2)'; its store description gives 120W+120W at 4Ω on 48V/5A. The Q10 gives up to 100W + 100W with no load or supply; the G7 gives 300W x 2 at 4Ω, and its description shows a power output table as an image captioned 'estimated values'. None of the five reviews cites an independent test.
Which of these amplifiers has a turntable input, a headphone jack or a subwoofer channel?
Of the five, only the NS-13G MAX has an MM phono input (5mV; its page lists MM only), only the A5 PRO lists a headphone jack (500mW at 32Ω, for 16-600Ω headphones, played together with the speaker outputs on one volume and tone setting) and only the NS-14G PRO has a separate subwoofer channel (2-8Ω, 50Hz-220Hz cutoff, ±4dB gain); the NS-13G MAX's AUX output can feed an active subwoofer but follows the main volume and tone. The ST-01 PLUS, which we reviewed but did not pick, adds Bluetooth 5.2 to an MM phono input; its $99.99 is the option without a power adapter.
Are Douk Audio and Nobsound the same company, and which chips do they use?
They are brand names sold by the same store and seller: doukaudio.com, which its contact page says is run by Shenzhen Anba Technology Co., Ltd and HONGKONG LONGSHENG Import and Export Trading Co., Limited. Most of our 30 reviews of the store's stereo amplifiers name a class D chip for the amplifier itself, most often the TPA3255 or the TPA3116; among these picks, the A5 PRO, NS-13G MAX, NS-14G PRO and G7 list the TPA3255 and the Q10 the TPA3221. The Q10 is a Nobsound model; the other four picks are listed under the Douk Audio name.
What does it cost to return a Douk Audio amplifier?
The return page says to ask within 30 days of delivery and wait for approval; an approved return has to ship within 7 days. Original and expedited shipping, duties, taxes and customs charges are not refunded unless the law requires it or the store made the error, and items need all packaging and accessories and no excessive wear, or the store can refuse them or refund part of the price. The return page does not say who pays return postage, and an older refund page excludes change-of-mind returns from free after-sale service.
How long does delivery take, and what warranty applies?
The current shipping page says 2-8 business days, with duties, taxes and customs fees included at checkout; an older page still online says airmail takes 10-25 days and the store is not responsible for import duties. The warranty page gives 24 months for manufacturing defects, with free repair, a replacement unit and free shipping both ways for covered repairs; drops, liquid, DIY repairs, lightning, extreme temperatures and misuse are excluded (partial fees may apply). The older refund page still says 1 year.