Alright, so I managed to install a set of 12's in my 1990 notch. I wanted to keep my trunk space so I'm running them free air, had to custom make a board just behind the back seat. The speakers are pretty cheap (Pyle's, I know, I know). I running an old school PPI amp from the early nineties. These things were powerhouses so I know it's sufficient. I installed a soundstream eq with built in crossover. I don't have a good seal around the board that holds the speakers. There's some space on each side. Could this be a culprit? What could I seal the gaps with? Will styrofoam work? Could the speakers just be garbage? They're new and I thought they would put out something at least, but the sound is disappointing. The amp is two channel and the speakers are Two 4-ohm dual voice coil subs wired in a way that supposedly puts a 4 ohm load on the amp. Thanks for the help.