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  1. Dave Upton

    Subwoofer pulsing/heartbeat issue!

    It sounds like your amp is going into protect mode. Is it getting hot to the touch?
  2. Dave Upton

    Subwoofer pulsing/heartbeat issue!

    Hi Alfredo, Does this sound happen when the receiver is disconnected? I'm not quite clear if you are saying you only hear it when the amp is connected to the Onkyo. Does running the amp in mono vs bridged mono made make any difference?
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