Class D and solid-state stereo amplifiers, many with Bluetooth, compared by chip, power, inputs and the power supply they need.
Ampapa D1 TPA3255 Amplifier with VU Meters — read reviewA TPA3255 amplifier built for 2.1 systems: an adjustable 30-200Hz high-pass keeps bass out of the main speakers, while a full-range PRE-OUT feeds a subwoofer — plus Bluetooth 5.2 and an OLED with 7 VU styles.
Douk Audio G7 2.0/4.0 Channel Digital Amplifier — read reviewA dual-TPA3255 power amplifier delivering up to 300W x 2 or 150W x 4, with two sets of speaker outputs for A/B testing or dual zones, XLR/TRS combo and RCA inputs, and retro blue VU meters.
Douk Audio A100 TPA3255 Power Amplifier 300W — read reviewA TPA3255 power amp with four working modes - stereo or bridged mono, bass or full-range - for driving speakers and subwoofers. Up to 315W in mono from the included 48V/5A supply, with Super Bass and SW-FREQ knobs.
Douk Audio NS-14G PRO TPA3255 Amplifier — read reviewA 2.1-channel amp with two TI TPA3255 chips delivering up to 300W each for left, right and subwoofer, plus QCC304X Bluetooth with aptX/aptX-HD. Dual power sockets and three-sided ventilation keep it running through demanding sessions.
Nobsound NS-13G 2.0 Channel Amplifier 100W+100W — read reviewA straightforward wired mini amp: dual TPA3116D2 chips rated at 100W+100W, stereo RCA input, treble and bass knobs with bypass, and a 19V supply in the box driving 4-8 ohm speakers.
Nobsound NS-20G Bluetooth Headphone Amp 100W+100W — read reviewA two-in-one mini amp: two TPA3116 chips drive 100W x 2 into speakers while a 3.5mm jack handles 15-32 ohm headphones, with Bluetooth 5.0 + DSP reaching 15m and a dynamic volume LED display.
Nobsound M5.1 5.1 Channel Home Theatre Amp — read reviewFront, surround, center and subwoofer channels in one compact box, with Bluetooth 5.0, optical, coaxial, USB and 5.1 RCA inputs for a mini home cinema rig.
Nobsound M10 TPA3255 Bluetooth Amplifier — read reviewA palm-sized TPA3255 amplifier rated up to 300W x 2 for 4-8 ohm speakers, with Bluetooth 5.4 (aptX-HD, aptX-Lossless, LDAC), USB-C and AUX inputs, plus treble and bass knobs.
Nobsound NS-02G PRO Class A Amplifier — read reviewA solid-state single-ended Class A stereo amp Nobsound rates at 30Wx2 (8 ohm) or 42Wx2 (4 ohm), on universal 100-240V power.
Douk Audio A5 PRO TPA3255 Bluetooth Amplifier — read reviewA compact class-D power amp on TI's TPA3255 chip with Bluetooth 5.1, bass and treble knobs and a 500mW headphone output, rated up to 300W x 2 into 4 ohms. A tempered glass panel makes op-amp swaps a quick, tool-light job.
Douk Audio A5 TPA3255 Stereo Amplifier — read reviewA compact class-D power amp with a TPA3255 chip and a tunable 30-200Hz high-pass filter that keeps low-frequency clutter away from small speakers. Rated 300W x 2 at 4 ohms, with a tempered glass panel for quick op-amp rolling.
Douk Audio M1 MAX TPA3255 Power Amplifier — read reviewDouk's $109.99 M1 MAX runs TI's TPA3255 chip with Bluetooth, RCA, and USB-drive input; the datasheet, Douk's power table and a bench test of a related amp show its real power limits.
Douk Audio M1FM TPA3116 Digital Amplifier — read reviewA stereo receiver combining a TPA3116D2 amp (50W x 2 at 4 ohms), Bluetooth 5.1, an FM tuner spanning 76-108MHz and RCA/AUX inputs - all controllable by the included remote. Four pluggable NE5532 op-amps add upgrade potential.
Douk Audio NS-13G MAX Amplifier with Phono — read reviewA compact TPA3255 power amp with a built-in MM phono stage, so a turntable can plug straight in. It ships with a 48V/5A adapter (120W+120W into 4 ohms in the store's table) and adds tone/bypass switching plus a swappable op-amp.
Douk Audio ST-01 PLUS TPA3255 Amplifier — read reviewA mini TPA3255 amp with Bluetooth 5.2, an MM phono input for turntables and a dancing analog VU meter. It is headlined at 300W per channel, but the store's table gives 78W at 4 ohms on the 32V/5A adapter.
Douk Audio M1 PRO Bluetooth Amplifier 160W — read reviewA 160W x 2 desktop amplifier with TDA7498E power, Bluetooth 5.0, RCA and U-disk inputs, tone controls and a low-frequency output for an active subwoofer.
Nobsound NS-10G Bluetooth Amplifier 50W+50W — read reviewA palm-sized TPA3116 amplifier rated 50W x 2 with Bluetooth 5.0, USB and AUX inputs, a dedicated bass boost button, and an aluminum case weighing just 105 grams.
Nobsound NS-15G TPA3116 Amplifier 100W+100W — read reviewA 320g mini amplifier with dual TPA3116D2 chips rated at 100W+100W, Bluetooth 5.0 input reaching 50ft, treble and bass knobs with a tone bypass, all in a CNC-machined aluminum case.
Douk Audio M4 Bluetooth 4-Channel Amp 50W — read reviewA four-channel digital amp quoted at 50W per channel for multi-room or four-speaker setups, with Bluetooth 5.0, dual RCA and U-disk inputs and per-channel volume.
Nobsound NS-01G MAX Amplifier 100W+100W — read reviewA super-mini TPA3221 amplifier rated up to 100W+100W under a 24V/8A supply, with Bluetooth 5.0 and AUX inputs and a pre-out for subwoofers, active speakers or a second amp.
Nobsound NS-04G PRO Stereo Amplifier 100W x 2 — read reviewA bare-bones stereo power amp with a stereo RCA input and 100W + 100W of TPA3116D2 class-D power into 4-8Ω speakers for $46.99.
SMSL A300 Power Amplifier — read reviewA desktop digital power amplifier listed at $195.99, with an Infineon amplifier chip, RCA, USB and Bluetooth V5.0 inputs and a bridged BTL mode. The page rates it at 165Wx2 into 4Ω and says it is designed with bookshelf speakers in mind.
SMSL VMV A2 DAC and Power Amplifier — read reviewA desktop DAC and power amplifier with an XMOS XU216 USB receiver, six inputs, Bluetooth V5.0 with LDAC and 200Wx2 at 4Ω, listed at $999.99. It suits buyers who want a DAC and a speaker amplifier in one box and accept a page that names no DAC chip.
Nobsound NS-10G PRO Bluetooth Amplifier DSP — read reviewAn upgraded mini amp built around a TPA3221 chip rated at 100W x 2, with Bluetooth 5.0 + EDR + DSP reaching 15m, a deliberately volume-knob-free circuit path, and gold-plated binding posts.
This guide covers the 30 stereo and Bluetooth amplifiers reviewed from Douk Audio's store at doukaudio.com, which sells the Douk Audio, Nobsound and Ampapa brands (amplifiers sold by HiFiGO, added on October 28, 2026, have their own reviews on this page and are not counted below): 17 of the reviews are Nobsound, 12 Douk Audio and one Ampapa. Prices run from $29.99 to $359.99 as priced on October 23, 2026, and 12 of the 30 cost under $50. Compare the amplifier chip first. Ten listings use Texas Instruments' TPA3255, 12 use the TPA3116, four the TPA3221 and one a TDA7498E; three (a main-unit-only listing, the four-channel M4 and the Class A NS-02G PRO) name no chip. Most of these chips are class D, a switching design common in small amplifiers. Then match inputs to your sources: 21 of the 30 have Bluetooth, two have a built-in MM phono input for a turntable, two have an optical input and two list balanced inputs.
Treat the wattage as a ceiling that depends on the power supply. The A5 headlines 300W x 2 at 4 ohms, but Douk's own table for it gives 78W+78W at 4 ohms on a 32V/5A supply and 107W+107W on 36V/6A. For the M1 MAX the table gives 78W per channel on the stock supply, 120W on 48V/5A and 250W on 48V/10A, the last two sold separately. The 100W + 100W TPA3116 listings carry conditions too: the NS-13G and NS-15G quote it 'above 24V / 8A into 4 ohm' yet include a 19V supply, and the NS-01G MAX lists 30W+30W with its bundled 19V adapter. Six listings (the A100, NS-14G PRO, NS-10G, NS-10G PRO, M5.1 and Q10) give watts without naming a speaker impedance, the load in ohms, anywhere in their text.
Douk Audio's store applies the same terms to every one of its listings here. Its shipping page lists 2-8 business days, with duties, taxes and customs fees included in the checkout price unless noted; none of the 30 reviews gives a shipping fee. Returns must be requested within 30 days of delivery and approved by Douk before the item goes back, within 7 days of approval; original shipping fees and duties aren't refunded, and the reviews do not say who pays the return shipping. The warranty is 24 months from purchase for manufacturing defects, with free repair or replacement; an older Douk policy page still says 1 year, so confirm which applies before you order. HiFiGO, the other store on this page, ships from China, gives 7 days to report a faulty item and charges a 30% restocking fee on later returns; each HiFiGO review spells out its terms.
Check the version before you order. Twelve listings sell a version without a power supply or make the adapter optional: the A100, M1 MAX, ST-01 PLUS, NS-10G, NS-10G PRO, NS-20G, M10, NS-01G PRO, NS-04G PRO, NS-15G, Q10 and the $54.99 main-unit-only listing, which covers eight models at one price and publishes almost no specifications. The remotes on the G7 and M1FM may come without AAA batteries, and the M10's USB-C input works only with Windows 7 to 11 computers, not with phones or Macs. The reviews report no independent measurement of the exact amplifier they cover; the M1 MAX review cites a bench measurement of a related TPA3255 amplifier sold under another brand.
| Review | Price | Amp chip | Inputs |
|---|---|---|---|
| Ampapa D1 TPA3255 Amplifier with VU Meters | $199.99 | TPA3255, on the Douk Audio A5 platform | RCA, balanced TRS and Bluetooth 5.2 |
| Douk Audio G7 2.0/4.0 Channel Digital Amplifier | $299.99 | 2x TPA3255, up to 300W x 2 or 150W x 4 | Balanced XLR + TRS combo plus dual RCA |
| Douk Audio A100 TPA3255 Power Amplifier 300W | $139.99 | TI TPA3255 with PFFB, 4-layer immersion gold PCB | Stereo L/R RCA only (sensitivity 2V); no wireless input listed |
| Douk Audio NS-14G PRO TPA3255 Amplifier | $134.99 | 2 x TI TPA3255 | — |
| Nobsound NS-13G 2.0 Channel Amplifier 100W+100W | $54.99 | 2 x TPA3116D2 | — |
| Nobsound NS-20G Bluetooth Headphone Amp 100W+100W | $45.99 | 2 x TPA3116 | Bluetooth and AUX, per the page's parameters |
| Nobsound M5.1 5.1 Channel Home Theatre Amp | $169.99 | — | Bluetooth 5.0, coaxial, optical, U-disk, 2.0CH RCA, 5.1CH RCA |
| Nobsound M10 TPA3255 Bluetooth Amplifier | $89.99 | TPA3255, max 300W x 2, drives 4-8 ohm speakers | Bluetooth, USB-C (Windows PCs) and AUX |
| Nobsound NS-02G PRO Class A Amplifier | $359.99 | — | 2 groups of RCA with an input switch; rated input level 500mV |
| Douk Audio A5 PRO TPA3255 Bluetooth Amplifier | $114.99 | TI TPA3255 with PFFB circuit | Bluetooth 5.1 / stereo RCA |
| Douk Audio A5 TPA3255 Stereo Amplifier | $89.99 | TI TPA3255 with PFFB circuit | Stereo RCA only (sensitivity 2V) |
| Douk Audio M1 MAX TPA3255 Power Amplifier | $109.99 | TI TPA3255, rated 315W/4-ohm channel at 10% THD per TI's datasheet | Bluetooth, RCA, U-disk in; banana speaker and 3.5mm AUX out (shared level) |
Often less than the headline on the supply in the box. Douk's table for the A5 gives 78W+78W at 4 ohms on 32V/5A against a 300W x 2 headline, and its M1 MAX table gives 78W per channel on the stock supply, 120W on 48V/5A and 250W on 48V/10A. An independent blog measured a related TPA3255 amplifier from another brand at about 83W per channel into 4 ohms at 0.1% distortion on a 32V/5A-class supply.
Many do, but 12 of the 30 Douk Audio store listings also sell a version without one or make the adapter optional, so the price shown may not include it. Included supplies run from 19V in the NS-13G, NS-06G, G3 and TONE to 48V/5A in the NS-13G MAX and NS-14G PRO. Match the voltage and current the listing states, and check which version is in your cart.
Among the 30 Douk Audio store listings, only two list a phono input: the NS-13G MAX ($114.99) and the ST-01 PLUS ($99.99). Both are MM only, meaning moving-magnet cartridges; the reviews say moving-coil (MC) cartridges are not supported without an external step-up. The other Douk listings give RCA line inputs, so a turntable would need a separate phono preamp.
Among the 30 Douk Audio store listings, only two list a headphone output: the A5 PRO, rated 500mW at 32 ohms for headphones of 16-600 ohms, and the NS-20G, whose 3.5mm jack takes 15-32 ohm headphones only. On both, the headphone output plays at the same time as the speaker outputs.
Among the Douk Audio store listings, twelve of the 21 with Bluetooth list version 5.0; the A5 PRO, M1 MAX and M1FM list 5.1, the D1 and ST-01 PLUS 5.2, the M10 5.4. Only five name codecs, the formats Bluetooth audio uses: the ST-01 PLUS (SBC, aptX, aptX-LL, aptX-HD), M1 MAX and M1FM (SBC, AAC, aptX, aptX-HD), NS-14G PRO (aptX, aptX-HD) and M10 (aptX-HD, aptX-Lossless, LDAC).
Douk Audio's store allows a return request within 30 days of delivery. Douk must approve it first, the item goes back within 7 days of approval, and original shipping fees and duties aren't refunded. The warranty is 24 months from purchase for manufacturing defects, with free repair or replacement, although an older policy page still says 1 year. HiFiGO's terms differ (7 days for faulty items, a 30% restocking fee on later returns) and are in each HiFiGO review.