Well, you know what im packin in my trunk, so ill get straight to the point. I'm runnin' both of those on a 500 watt p5002 Rockford Amp, I'm not bridging them. When I turn my gain up, and the volume up, my subs make a almost hollow sound like wood vibrating. (Hitting a rubber hammer on a sub woofer box) Anyways, the sound is hard to describe but would this be because my subs are blown, or a box problem? If anyone knows of such a problem let me know how to fix it, or if it's cause of my low budget and not buying a better sub/box/amp combination. =D
The insulation in the port is most likely your problem. A fully stuffed port will act about twice as long because the air travels through about half as fast and your enclosure will seem 1.35x the size (transmission line basics). It's gonna give you an odd (very low) tuning frequency that is probably to low for your subwoofer to handle, causing overexcursion. Seal the port holes with something solid, like MDF, and see how it sounds.