The $100 amp that drives bookshelf speakers like gear triple the price
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- The headline 300W rating needs a higher-amp power supply than the one included to reach full output
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The Fosi Audio BT20A Pro is a compact Class D stereo amplifier built on the TPA3255 chip, designed to drive passive bookshelf or small floorstanding speakers from a turntable, TV, or phone. It offers Bluetooth 5.0 alongside RCA inputs, with dedicated bass and treble knobs and very low idle power draw. The rated 300W x2 figure requires a high-amperage supply; with the included adapter it still delivers clean, room-filling power for most home setups. It has become a cult favorite among budget hi-f
Pros
- TPA3255 Class D delivers clean, room-filling power for the price
- Bluetooth 5.0 plus RCA inputs cover streaming and a turntable
- Bass and treble knobs give real tone control
- Tiny footprint hides easily in a shelf system
Cons
- The headline 300W rating needs a higher-amp power supply than the one included to reach full output
Frequently asked questions
Does it come with speakers?
No. It is an amplifier only. You connect your own passive bookshelf or floorstanding speakers and a source like a phone, TV, or turntable.
Can I use it with a record player?
Yes, if your turntable has a built-in phono preamp or you add one. The BT20A Pro takes a line-level RCA input.
Is 300W per channel real?
That figure requires a 48V high-amperage power supply. With the included adapter it puts out less, but still plenty of clean power for typical rooms and bookshelf speakers.
Does it support Bluetooth?
Yes, Bluetooth 5.0 for wireless streaming, plus wired RCA inputs when you want a direct connection.
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