UPDATE:
I contacted Paradigm and they verified that I was indeed correct about the warranty. In the meantime, my wife informed me that she had thrown out the receipt about a month earlier !!!
I went back to the dealer who sold me the sub and showed him the Email from Paradigm and informed him of the fact that I didn't have the receipt. He told me he would try to look through his files to see if he could come up with his copy. In the meantime I sent the amp module to a repair place and they told me it was completely fried.
If I really wanted to persue this I could go back to Paradigm and argue that the PDR-10 v.4 hasn't even been on the market for 3 years yet, but it isn't that great a sub anyway - I think it will go in the closet with all the other gear that some day I will have refurbished (some day).
I mostly listen to live concert DVD's/Blu-Rays and from the research I've been doing on subs, the consensus seems to be that a sealed sub will perform better musically than a ported one.
I just read a glowing review at Audioholics about the Emotiva Ultra 12 and it's within my price range (sub $500).
Does anyone have any experience with this unit?
Thanks!