best buy says they will replace subs that blow, because they most likely will blow.
honestly, just stay away from best buy crap...
the sub companies listed dont need warranties, cuz if you know what your doing, 99% of the time, the subs will outlast your want for that particular system (your more likely to sell the subs for something new before they will ever blow) ... the only time you really see any of the subs smoke a voice coil is either 1.) a noob hooks everything up wrong 2.) someone is using them on a meter... and REALLY pushing them (not going to be your typical daily set up).