I got 2 car audio 15 ivx subwoofers and a skar lp750.1d amp I didn't expect window shattering bass but they barely hit harder then my kenwood 12s and 400 watt amp they are in a sealed box I know a ported would be louder but I'm really just not impressed with them at all and when I have xm radio on I barely even notice they are there could it be a wire problem or is this really all there is to them I also know you get what you pay for with car audio but I honestly was hoping for something to keep me interested at least until next spring but i don't think they are going to last me the summer