ZK-ST21 Bluetooth 2.1 Channel Power Amplifier Board
ZK-ST21 is a 2.1 channel power amplifier board using TPA3221 with Bluetooth, AUX, and USB inputs. Notable for strong bass control and solid power output, with easy assembly and good value per user feedback
Highlights
- TPA3221 stereo 2.1 power for bass-heavy output
- multiple input methods
- bass and treble control
Pros
- 2.1 channel power output
- multiple input options (Bluetooth, AUX, USB)
- solid bass control
- easy to assemble
- valued for money
Cons
- mixed reviews on Bluetooth connectivity
- some reports of device stopping unexpectedly
- noise issues reported by a customer
Best For
Features
- TPA3221 dual-channel amp delivering up to 100W*2 and 200W total
- DC input range 12-30V supporting wide-voltage operation
- 2.1 channel configuration with built-in subwoofer support
- Multiple input options: Bluetooth, AUX, and USB drive input
