Pulsing Sub

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mnemesis

Member - Posts: 2

Joined: May 23, 2004

Location: Australia

Posted: May 23, 2004 at 8:18 PM / IP Logged

I have a Pioneer DEHP4650 HU, JBL GTO4000 amp, factory fitted speakers, and a Pioneer 12" sub, this is in a Mitsubishi Magna. At the moment the sub is pulsating both randomly and sometimes on a regular beat, even with the volume control right down or on mute. I have adjusted the gain and the ground connection but it is still having fits every now and then. I was just wondering what could be the problem, and most importantly, how to fix it.

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lspker

Silver - Posts: 503

Joined: November 23, 2003

Location: Canada

Posted: May 23, 2004 at 8:54 PM / IP Logged

Sounds like you may have blowenthe grounds off your rca's (probably in the deck) check by temporarily attaching a ground to the shield (outside) of rca at amp, if thumping goes away then find where and you the ground blew off.

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NowYaKnow

Gold - Posts: 1,217

Joined: December 18, 2002

Posted: May 23, 2004 at 10:21 PM / IP Logged

As mentioned I would start by checking for bad rcas or a bad connection on the rcas.. Good luck,

Mike

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Pulsing Sub

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