Got the new Rumble 500 today. I'm playing my Blacktop Jazz through it.This thing has no low end, none. When I bought the bass a week ago I played through the Rumble 200 and it seemed to be giving me some good smooth lows. I was told here and read other reviews that the 2x10 combo would be even better. I spent an hour adjusting the amp and bass every way possible to no avail. The amp is didn't seem to be any louder than the 200 either. I don't know if it's the bass or the amp but this is all mid. Clean, clear and punchy but all mid. I'm about ready to give up. This is the third bass/amp combo I've tried and still can't get the sounds I'm after. I wood like some very low smooth sounds. Think Sting, The Eagles, Dave Mathews Band but also stuff like Rush, tool Red Hot Chili Peppers. I ordered the amp through GC and live just a few miles form one if I need to return it. What else can I try?