Yeah but my HU has 5 volt pre outs. I'm not even sure how it got to working. I know a fair amount and can usually troubleshoot my problems but this one had me stumped. So I took it to the shop and my buddy chad who's been doin this shit for about 10 years took a look at it. He was fiddlin around in the trunk with this weird lookin tool I've never seen before and finally he got it workin. But with the bass at 0 on the HU and the gain at less then 3/4 on the amp, the bass was next to nothing. But with the bass on 11 on the HU and the gain almost all the way up it pounds. Haven't tried setting the gain properly to 50 volts yet but I'm gonna try today and see if it reads out right.