annoying subwoofer anomaly (help!)

[oh_well_69]

I recently replaced the audio system in my new cobalt. The system itself sounds great, but I am incurring a subwoofer anomaly. Whenever the head unit volume is turned to off while listening to the radio or a cd, or in the time switching between modes(radio, cd, aux.) until the receiver starts sending audio to the sub, and for the few seconds during powering up or turning off the receiver, the subwoofer kicks like once per second monotonously for no reason. As soon as the volume is turned up or the mode switch is completed(the cd starts playing for instance) the subwoofer operates completely normally. The volume of the kicking during these anomaly periods seems to be slightly variable but always loud enough to be highly annoying. Any insight would be greatly appreciated.

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[Wowimzz 10+ year member]

check you ground, it sounds like a grounding problem to me. the wire may be too small (thin) or it is not on bare metal.

 

[Little B 10+ year member]

Check your wiring especially your ground-wire on your amp and your head-unit.

 

[squeak9798 5,000+ posts]

Only one thread, in one section, was necessary. No reason to post three threads in three different sections.

You can try grabbing a DMM and measure the RCA's going to the subwoofer amplifier during these periods to see if the pulsing is coming from the headunit or if it has to do solely with the amplifier.

 

[phantom240 5,000+ posts]

I know that with my amp, when it powers on, it gives a kick... of course its a pretty hefty amp for its day and class a/b. Might just be normal or possibly improper gain set