I have a Athena P6000 sub, I went to ABC Warehouse and Best Buy and we hooked up the sub, they both said the amp is blown. Is it worth it to get it fixed, or should I just buy a new sub. If I do get a new sub, what is a good sub for $400 or less.

Check out the DIY speaker forum. For my money the you will be hard pressed to do better than a Rythmik kit at $429 (http://rythmikaudio.com/DS12.html)or one of the Parts Express kits (http://www.partsexpress.com/webpage.cfm?webpage_id=3&CAT_ID=48&ObjectGroup_ID=536) starting at $315 (free shipping often offered)