K.
Disconnect the sub from the amp.. grab a AA battery and touch it to the speaker leads to pop the subs, make sure they work. I've seen both go out before (tinsel leads snap on Polks, bleh). Then reconnect them if they work.
Then grab an Ipod or something and a stereo to RCA cable... plug it directly into the amp and play some music.
If it still doesn't work.. yea, amp's probably shot.
And what's so wrong with power acoustik :P
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