TPA3255 2x300W High Power Dual Channel Stereo Audio Amplifier Digital Power Amplifier Board

The ZK-MT21S amplifier performs well overall—the sound quality is solid and installation was easy. It’s just a bit bulkier than I expected, but it still fits in my setup without issues.

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!

I’ve been using this Creatall AS21 amplifier for my home theater setup for a month, and it’s been fantastic! The build quality is top-notch—metal construction feels durable and premium. The TPA3255 chip delivers crisp highs, balanced mids, and deep, punchy bass that fills the room without distortion. Bluetooth 5.1 pairs quickly with my phone and smart TV, and the connection stays solid even through walls. I appreciate the multiple input options (AUX/USB/Bluetooth) that let me switch between devices easily. The protection features (overheat, short circuit) give me peace of mind for long-term use. The company’s customer service was responsive when I had questions about wiring, and the sample delivery was fast (arrived in 7 days as promised). For the price, it’s way better than some expensive brands I’ve tried—highly recommend for anyone looking for a reliable, high-performance amplifier!