Originally Posted by
MLA
If its factory installed, the warranty would likely be with Skiers Choice. A completely dead woofer seems like something else other then tuning. Even with the gains down low, there should be some detectable movement with the volume up. A quick check with an ohm meter will tell a lot about the woofer circuit.
There was a couple of threads regarding this same poor performing woofer topic, and at least a couple reported back that it was resolved with a complete system tune.
A "free-air" (Infinite-baffle) can move about the same amount of air as a same size woofer with the same amp wattage in a sealed enclosure.