hey guys!! i just hooked up my subs...... again with a new amp but im still having same problems. i have 2 12" pioneers and a ultralinear amp. the amp is 1200 watt max and 400 watt at 4 ohms. im pretty sure my subs run at 4 ohms. the problem is they move alot but make almost no sound!!. when i unplug one of them it sounds much better. any ideas?