Question about Infinity TSS-450 System

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The problem is with the system subwoofer. I am having a problem that has been commonly referred to on web searches as a "heartbeat". I have checked power to the transformer, validated secondary voltages (positve and negative in relationship to ground) and also the voltage regulator and filter caps. All of those areas check out OK. The speaker has been isolated using an external source and it works fine. There is a small blue relay on the primary amplifier pcb that clicks and then resets everytime the speaker pulses with the "heartbeat" sound. Suggestions?

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Try turning the gain down on the sub (I would assume you have already done that) and see if that makes a difference, too much gain will also cause the thumping.. When you say they check ok what do you mean? Did you get voltage and resistance values, are they within tolerence? Chances are its a power supply problem as most common problem, the secondary cause is a bad/failing circuit causing intefference in the system.

Posted on Oct 05, 2009

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