kicker squares sound pretty bad compared to many many other subs, especially at higher volumes. do yourself a favor and run with the compVR's if you really want to run kicker...not a bad sub [img]smile.gif[/img]
also, how did you set the gain on your amp? There are only two ways to blow a sub...
mechanically: occurs when the sub is forced to move farther than the suspension can handle. This leads to torn surrounds, misaligned voice coils, ripped/seperated spiders, and other types of damage from physical stress
thermally: occurs when too much power is driven into the voice coil (the coil of wire that rests in the magnetic gap that carries the current from the amp). If too much power is applied the voice coil will get too hot and the glue will melt or the wires will physically burn up. This is why a sub smells burnt when you blow it up this way
a larger voice coil usually indicates more power handling...but there's also factors such as how many layers on the coil, what kind of material is used (copper, aluminum, etc), and how well the voice coil is vented for better cooling.
if you want cheap subs that will work great on lower power and last a while...
Kicker CompVR's (as mentioned)
IDQ 10's (lil more expensive...think around $150 locally)
Elemental Design e10k's ($110 per+shipping, 3 year warranty, flat cone, 325W RMS, blah blah. one bad thing, new production models so they won't be ready until after June 1st)
Memphis Power Reference or Studio 10's (200W RMS, perfect for your amp. we sell em for $80 for the PR
's and $100 for the Studio's...if i remember right)
there's more but i don't know your budget [img]smile.gif[/img] so i just listed the ones on the lower price range but are still great subs (good to great performance, especially for the price)