Home Stereo power diversion problem

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Room113
Home Stereo power diversion problem

I have a RCA RT2770.  It was workin great up till last week.  Now, it seems to be sending the power normally for the sub into the rest of the speakers.  When the sub is on and plugged in, the rest of the speakers seem to be pushing alota power and bass, more than they can handle really.  When you turn off the sub or unplug it, the speakers go back to normal.  I've tried rewiring the speakers.  I turned it off for a few days and tried it again.  My only theory is that the sub has gone bad and the power is being sent to the speakers somehow.  Help please!

 

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