Best Picks
Tech & Gadgets

Douk Audio ST-01 PLUS HiFi Bluetooth TPA3255 Digital Amplifier with VU Meter Review

A mini TPA3255 amp with Bluetooth 5.2, an MM phono input for turntables and a dancing analog VU meter. Rated 300W per channel at 4 ohms, with adjustable bass, treble and VU sensitivity in a slim aluminum shell.

3.63.6 out of 5 starsUpdated October 14, 2026
$99.99Price checked October 14, 2026
Check price at Douk Audio
Douk Audio ST-01 PLUS HiFi Bluetooth TPA3255 Digital Amplifier with VU Meter

Our verdict

The ST-01 PLUS squeezes an amp, a Bluetooth 5.2 receiver, an MM phono stage and a retro VU meter into a very small box for $99.99. It drives most passive speakers with up to 300W per channel available, and the adjustable-sensitivity VU meter is a functional flourish rather than pure decoration. Pick your power adapter option carefully, and remember MC cartridges and higher power demands are not covered.

Best for
Small-system builders who want Bluetooth, a turntable input and a VU meter in one compact amplifier.
Skip if
You use an MC cartridge, or you need maximum output without buying a larger power supply.
Check price at Douk AudioHow we research

The Douk Audio ST-01 PLUS is a mini stereo amplifier priced at $99.99 that combines a TPA3255 class-D amp, Bluetooth 5.2, an MM phono stage and a vintage-style VU meter in a chassis small enough for a desk at 115x100x60mm.

Power output reaches 300W x 2 into 4 ohms, which the maker says can drive most home passive speakers with low distortion, and the amp works from DC 24-48V (a 32V/5A supply handles most speakers, with larger supplies for more headroom). Inputs cover Bluetooth 5.2 via the QCC304X chip - supporting SBC, aptX, aptX-LL and aptX-HD for low-latency wireless streaming - plus stereo RCA and an MM phono input with 5mV sensitivity for turntables. THD+N is 0.02% at 1kHz, SNR is 107dB or better, and the response spans 20Hz-20kHz within plus or minus 1dB.

Outputs are banana speaker jacks and a 3.5mm AUX output at a 2V rated level for connecting another amplifier or active speaker and subwoofer. The integrated VU meter brings a retro touch, and its sensitivity can be adjusted to match different input signals - so it works as a calibration aid as well as decoration. Bass and treble are adjustable (plus or minus 6dB), Bluetooth pairing records can be cleared with one function, and input indicators show the working status in real time. The AUX and speaker outputs share one volume and tone control.

Douk Audio ships worldwide with free and expedited shipping options at varying cost by country. Packages under 2kg travel by airmail in roughly 10-25 days, while orders over 2kg ship via DHL/UPS/FedEx in about 5-8 days, and any import duties or customs charges are the customer's responsibility. Returns are free within 30 days for a full refund, and every item carries a 1-year warranty. Exclusions cover orders placed by mistake, man-made damage or misuse, a change of mind, and anything outside the warranty terms.

What we liked

  • Bluetooth 5.2, stereo RCA and an MM phono input in one compact amp, so turntables, phones and CD players all connect
  • TPA3255 chip delivers up to 300W per channel at 4 ohms, enough for most home passive speakers
  • QCC304X Bluetooth supports SBC, aptX, aptX-LL and aptX-HD for low-latency, high-quality streaming
  • Analog VU meter with adjustable sensitivity doubles as a visual aid for real-time audio adjustment
  • Adjustable bass and treble, Bluetooth pairing record clearing and input status indicators in a sleek aluminum shell

Worth noting

  • Higher power output needs a larger supply than the default 32V/5A adapter - the maker says to prepare a high-quality one yourself
  • The 3.5mm AUX output and speaker jacks are controlled by the same volume and bass/treble settings
  • The phono input is MM only, and some purchase options ship without a power adapter at all

Questions before you buy

Can I connect a turntable?

Yes - it has an MM phono input with 5mV sensitivity. Moving-coil cartridges are not supported directly.

Which Bluetooth codecs does it support?

SBC, aptX, aptX-LL and aptX-HD through the QCC304X chip, for high-quality, low-latency wireless streaming.

What power supply does it need?

Working voltage is DC 24-48V; the default 32V/5A supply satisfies most home speakers, and a larger high-quality supply raises output.

Can I clear the Bluetooth pairing list?

Yes, the ST-01 PLUS supports clearing Bluetooth pairing records.

Keep comparing

More in Tech & Gadgets

See all Tech