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Grey compact stereo amplifier with volume knob and bass treble controls

Fosi Audio BT20A Pro Bluetooth 5.0 Amplifier 300W x2 Grey

SKU CH-EJTB-9SF6M

Two-channel Class D amplifier delivers 300 watts per channel into passive speakers with Bluetooth 5.0 and swappable op-amps for tailored sound

  • Audio channels2
  • Output power300 W
  • Output type300 W
  • Power supply48 V
  • Product colorGrey
  • Product dimensions14.2 in × 10.7 in × 0.41 in
  • 300 watts per channel drives demanding passive speakers
  • TI TPA3255 chip delivers 108 dB SNR and 0.005% THD
  • Swappable NE5532 op-amps let you tailor the sound signature
  • Bass and treble knobs give direct tonal control
  • Bluetooth 5.0 pairs quickly and remembers devices

Compact Two-Channel Integrated Amplifier

The Fosi Audio BT20A Pro is a Class D stereo receiver that delivers 300 watts per channel into passive speakers. It uses a TI TPA3255 chip with a feedback design and high-speed gate driver error correction for low idle loss below 2.5 watts. The unit ships with a 32 volt 5 amp power adapter and AC cord.

Op-Amp Rolling and Bluetooth 5.0 Pairing

Two socketed NE5532 operational amplifiers can be swapped for compatible alternatives such as LME49720HA, MUSES02, OPA2604AP, OPA2134PA, LM4562 or NJM4556AD to tailor the sonic signature. Bluetooth 5.0 provides wireless streaming with a memory function and alert tone; the pairing can be cleared by holding the volume control for five seconds. Bass and treble knobs allow flat response when centred.

Upgrade Path for Desktop and Bookshelf Systems

This amplifier replaces lower-powered mini amps or ageing receivers when more headroom and user-serviceable op-amp sockets are desired. The jump is worthwhile for listeners who want measurable distortion of 0.005 percent and a signal-to-noise ratio of 108 dB in a compact 547 gram chassis. It is not suited for buyers who require multi-channel surround decoding or built-in streaming services beyond Bluetooth.

How it compares

Measured against everything we stock in Stereo & AV Receivers, at today’s prices. Recalculated every night.

Price $185.99
Pricier than about 71% of the 144 comparable items (median $78.49).

Specifications

Product
Brand nameFosi Audio
Part numberBT20A Pro
Product colorGrey
Audio & video
Audio channels2
Ports & slots
Output type300 W
Power
Output power300 W
Power supply48 V
Size & build
Product dimensions14.2 in × 10.7 in × 0.41 in
Product weight547 g
In the box
In the boxBT20A Pro Bluetooth Amplifier x1, 32 V 5A Power Adapter x1, User Manual x1

Questions about this item

Does the Bluetooth 5.0 connection have a memory function for automatic reconnection?

Yes, the amplifier remembers paired devices and reconnects automatically when powered on, and it also provides an audible alert tone to confirm the link.

What are the exact dimensions and weight of the unit so I can check shelf fit?

The chassis measures 14.2 inches wide, 10.7 inches deep and 0.41 inches high, and it weighs 547 grams.

How do I replace the stock NE5532 op-amps with an alternative such as the LME49720HA?

Power off the unit, gently pull the two socketed NE5532 op-amps straight up, align the replacement op-amps' pins with the sockets and press them firmly in place.

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