I got curious and looked at the manual for your subwoofer on the Paradigm website -- which includes the warranty. There is absolutely nothing in the warranty statement about a one year warranty for the built-in amplifier. Jimmyrod is right that you should start by contacting Paradigm directly.
I would be grateful if you would post a follow-up letting us know what happens -- Speaking only for myself, I make it a policy not to purchase products from companies that I know have questionable warranty policies.
I would be grateful if you would post a follow-up letting us know what happens -- Speaking only for myself, I make it a policy not to purchase products from companies that I know have questionable warranty policies.