Kenwood Excelon subs for a kenwood excelon amp car audio? what are the best subs i can get for this amp Kenwood Excelon KAC-X20 i want 2 12 inch subs well with kenwood i would get the matching kenwood excelon KFC-XW1224D these are 12” sub woofers for 140 each kind of pricey or the reg. [...]