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I have an old Yamaha AST-C10 stereo. I recently bought a pair of Wharfedale bookshelf speakers (9.1)s, and hooked them up. When I turn the stereo on, the speakers emit a couple of fast heartbeat-like bass tones, then emit them slowly while oscillating the woofer from one extreme of travel to...

I have an old Yamaha AST-C10 stereo. I recently bought a pair of Wharfedale bookshelf speakers (9.1)s, and hooked them up. When I turn the stereo on, the speakers emit a couple of fast heartbeat-like bass tones, then emit them slowly while oscillating at about 1Hz The original speakers (Yamaha...