Not just for their subs but speakers too. SVS is rated as one of the elite brands for home subs, much better than anything you will find in stores, not even comparable. Now have a 45 day trail, but they also will cover shipping both ways which cant be beat. Shipping usually starts around $80 each way if it wasnt included.
http://www.svsound.com/
http://www.svsound.com/