Class D and solid-state stereo amplifiers, many with Bluetooth, compared by chip, power, inputs and the power supply they need.
Nobsound G3 Bluetooth Amplifier with Tone Control — read reviewA 55W x 2 mini amplifier with a TPA3116 chip, Bluetooth 5.0 and RCA inputs, a pre-out for 2.1 setups, and independent bass and treble controls.
Nobsound NS-01G PRO Amplifier 50W x 2 — read reviewA 50W x 2 mini amplifier on the TPA3116 chip with Bluetooth 5.0, USB and 3.5mm AUX inputs, sold in five colours with or without a power supply.
Nobsound NS-06G TPA3116 Class D Amplifier — read reviewA mini Class D amplifier with the TPA3116 chip delivering up to 60W x 2, standard RCA input and banana speaker outputs, and a DC 19V adapter included.
Nobsound NS-14G Bluetooth 2.1 Channel Amplifier — read reviewA compact 2.1-channel TPA3116 power amp with Bluetooth and RCA inputs, a dedicated subwoofer channel, and full tone/subwoofer level controls.
Nobsound Q10 Bluetooth Amplifier 100W — read reviewA palm-sized 116g Class D power amp with a TPA3221 chip rated at 100W per channel, Bluetooth 5.0 plus AUX and optical inputs, and all three cables included. One knob handles power, input switching and volume.
Nobsound TA-21 Bluetooth DSP Amplifier — read reviewA palm-size class-D amp on the TPA3221 chip, quoted at up to 100W per channel with Bluetooth 5.0 DSP, a 3.5mm AUX input and a digital volume display.
Nobsound TONE Mini Bluetooth Stereo Amplifier — read reviewA 50W x 2 mini power amp using the TPA3116 chip with Bluetooth and AUX inputs, an infinite-rotation encoder knob and a compact aluminum build with a DC 19V adapter included.
SMSL RAW-MHA1 Power Amplifier — read reviewA digital power amplifier built around an Infineon chipset, listed at $199.99. It has balanced XLR and RCA line inputs, stereo and BTL mono modes and a subwoofer line output, and suits a speaker setup that wants a balanced feed.
FiiO AIR AMP Streaming Power Amplifier — read reviewA desktop streaming power amplifier with a TPA3255 Class-D amp, an ES9020Q DAC, AirPlay, Roon Ready, WiFi and Ethernet, listed at $299.99 in Black or Silver. It suits buyers who want an amplifier, DAC and streamer in one box.
SMSL PA400 GaN Power Amplifier — read reviewA Class D power amplifier built on Infineon gallium nitride transistors, listed at $555 in four plug options. The page gives 250W in stereo mode and 500W in mono block mode with XLR and RCA inputs, so it suits passive speakers.
Douk Audio Amplifier Main Unit Only — read reviewA main-unit-only listing for eight Douk Audio and Nobsound amplifier models - A5, A5 PRO, ST-01 PRO, NS-13G MAX, M1 PRO, M4, NS-14G and NS-14G PRO - power supply not included.
TOPPING PA5 Class D Power Amplifier — read reviewA fully balanced Class D power amplifier with two TRS balanced inputs, listed at $226.85 beside a crossed-out $349. The page gives 140Wx2 at a 10% THD+N limit and names the D10 Bal and E50 DACs as partners, so it suits desktop speakers fed from a balanced source.
SMSL AO200 Digital Amplifier — read reviewA digital amplifier with two independent Infineon class D chips, 3-pin XLR inputs, Bluetooth V5.0 and a subwoofer pre-output, listed at $279. The page text gives no output power or distortion figures, so it suits buyers who can confirm those elsewhere.
TOPPING B200 Mono Power Amplifier — read reviewA mono power amplifier with a discrete NFCA circuit, three sets of balanced inputs and a 200W output claim, listed at $599 in Silver or Black. The page says two B200s are needed for a stereo system.
TOPPING LA90 Discrete Power Amplifier — read reviewA discrete NFCA power amplifier with selectable stereo and mono modes, three XLR/TRS inputs and a 12V trigger, listed at $799 in Black and White. The page quotes distortion under 0.0001% and a 143dB SNR; the White option showed as sold out.
TOPPING Mini300 Power Amplifier — read reviewA desktop power amplifier listed at $139 in white, black or silver. Its pictures give 140W x 2 into 4Ω at THD+N under 10%, balanced TRS and RCA inputs and a 12V trigger input. It suits a desktop chain that feeds speakers through binding posts.
TOPPING B100 Mono Power Amplifier — read reviewA mono power amplifier listed at $299 in silver or black. Its pictured spec table gives 100W into 4Ω at THD+N under 1%, three gain settings and balanced and single-ended inputs, and the pictures say two B100s are needed for a stereo system.
SMSL VMV A1PRO GaN Power Amplifier — read reviewA power amplifier listed at $495 whose pictures describe GaN (gallium-nitride) power devices and stereo or mono (BTL) modes. The spec table gives 160W x 2 into 4Ω and 85W x 2 into 8Ω in stereo, and 400W and 250W in mono. It suits buyers who want one amplifier for either layout.
SMSL DO200 and AO200 Stack — read reviewA stack of an SMSL DO200 USB DAC and an AO200 power amplifier with an XLR cable, listed from $768. The page text gives no performance figures; the pictures read for this review show panel labels, not specifications, so it suits buyers who will check the specifications elsewhere.
SMSL VMV D1se + A1 Amplifier Stack — read reviewA DAC and power amplifier pair, the VMV D1se and A1, listed at $1,379.99 with a 1m SKW OCC XLR cable per the page's package list. It suits buyers who want the three parts in one listing; no output power, DAC chip or sample rate appears in the page text or its four pictures.
SMSL VMA D2 + A2 Amplifier Stack — read reviewA DAC and power amplifier pair listed at $2,698.99 with a 1m SKW OCC XLR cable. The page text names Bluetooth with UAT and LDAC, PCM 32-Bit/768kHz and native DSD512 decoding and a sub-woofer pre-output, all under the heading Features of VMA A2, so it is unclear which unit carries them.