Build a stereo speaker system with a dedicated subwoofer using the ZK-MT21 amplifier board. Connect through Bluetooth 5.0 or AUX, then adjust bass, treble, subwoofer frequency and volume to suit your listening setup.
Features
- 2.1-channel output for left and right speakers plus a subwoofer.
- Bluetooth 5.0 with a listed unobstructed range of up to 15 metres.
- AUX input for a wired audio source.
- Rotary main control with long-press power switching.
- Reverse-polarity, overheating, overcurrent and short-circuit protection.
Specifications
- Power supply: DC 12–24V, 5A or higher.
- Compatible speakers: 20–100W, 4–8Ω.
- Listed output: less than 50W per left/right channel and less than 100W for the subwoofer.
- Input sensitivity: 500mV.
- Dimensions: 93 × 90 × 22mm.
Included
One amplifier board and one accessory pack. External antenna and antenna base are not included.
Before connecting
Do not use a 24V battery pack. Use a suitable DC power supply with a power rating above the amplifier's actual demand. Actual output depends on supply voltage and current, speaker impedance and audio input. This is a DIY amplifier board, not a complete speaker system.