Bought this amp over 2 years ago and put it in my truck, but it didn’t turn on or work at all, manufacturer wanted over half the cost of it to repair it + shipping, so I just left it to sit under the back seats. Recently installed new audio stuff in my truck so I took this out to redo all the wiring, tested it again, and it worked. I had the connections wrong the first time! Powering four 4" speakers with signal from a Nexus 7 installed in the dashboard, it sounds very clear and gets much louder than my old stereo head unit did.