they are very good. it won a comparison in Car Audio several years ago when it was still current including sound quality. It put out about 110x2 into 4ohms. I've had two of them in the past and I thought it sounded cleaner than the MTX Thunder amp I also had at the same time (which I subsquently switched to sub duty even though it was rated at 300x1 brigded instead of 360 bridged like the JBL).