The ZK amplifier board functions nicely—Bluetooth pairs quickly and sound is good. The instruction manual is a bit brief, but I managed to figure everything out with a little trial.
Top-notch CA-AS21 amplifier board! Installed it in my DIY speaker setup, and the sound output is brilliant. Works perfectly with 12-24V power, no glitches so far. Great purchase!
Perfect for my DIY project! I built a small bookshelf speaker for my study, and this module is exactly what I needed. The wide DC 8-18V input range is very convenient - I can power it with an old laptop charger. Sound is clear and crisp, no distortion at normal listening levels. It's compact and easy to wire, even for a beginner like me. Great product at a great price, arrived in Australia in 10 days.
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