Onkyo TX-SR605 Receiver "subs pulse" Questions

a pulsin sound from the subs i can turn my stereo off and there is a pulsin beat coming from my subs You don't give us much to go on... Are your subs self-powered? Disconnect the Line In to see if ...

Sansui 221 stereo receiver comes on, but no sound. Yes the wires are plugged into the receiver. When first turned on sound came through the speakers, then I noticed that the lighted back drop started ...

Had amp instaled with Yamaha YST SW 150 sub B&W 684 front B&W HTM61 centre yamaha NSA635 rear. At volume +2 the amp shuts down and was told it was the rear speakers cliping. I have tried using