I swear that this can make good sound. From 9 to 24 volts, this gets it done. The more volts, and current the better it will do. But if you use more than 12 volts, with 4 ohm speaker, best to put a small heatsink on the chip. Check out Youtube. A lot of people are using these. For about $6 or so, Cannot be beat. I have mine powering my subwoofer for my pc.