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thumping noise from sterio

Old 11-25-2014, 11:09 PM
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Thumping noise from stereo PLEASE HELP

Hi everyone. I'm new to the forum, hope someone can help. I have a thumping noise coming from the sub when the radio is on and the sound is on 0. I have replaced the rca cables and it still happens. The ground cable has been checked and is perfectly in place. The system was working perfectly for a long time and suddenly the problem started. Could it be the head unit? What else could it be? The system was working perfectly for a long time and suddenly the problem started. Could it be the head unit? What else could it be? Please help

Last edited by Tye1986; 11-26-2014 at 09:58 AM.
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Old 11-27-2014, 03:15 PM
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Pioneer head unit?
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Old 11-27-2014, 08:44 PM
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Alpine head unit. I've narrowed it down to the rca connection to the amp. Could be one of 3 things. Either a short in the mids, going to try and ground the rcas or its my 2 month old amp. Only 2 of a 4 channels are currently working. Still a slight whining noise though.
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