It just wont turn on anymore. It worked earlier this morning but when I went out for lunch it just didn't turn on. So I pulled it out, rewired everything, checked all my fuses, still nothing. I went ahead and ordered a Kenwood eXcelon X592. It was cheap and free shipping and should do everything I want. I'm thinking the 4000UB is toast. I'll bring it along whenever the meet up happens. Maybe I'm just retarded, haha. Yeah his SDC's sound really good man, I had never heard a set of those in person. They sound like they need a little more power, those subs are underrated anyways. Yeah, they could definitely use some more power. Whenever I have the money I'll go with a bigger amp. Something in the 2000 RMS range.