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Audio Systems/car audio fault finding

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Question
hi,
   i have just installed a pioneer p7750 head unit with fokal front splits 6inch with tweeter, rockford power series 6.5 inch speakers in the rear doors, orion 4 channel amp, orion mono block amp and two 10 inch rockford fosgate subs. all speakers are running of the 4 channel subs off the mono block. problem. the rear left hand side speaker cuts in and out. i have checked the connection at the 4 channel and it is all fine. the earthing system i did in the boot is a little dodgy i think it might have something to do with it im not sure. i havent checked connections at the actual speaker yet which is what i plan to do next. is there any other suggestions u can give me as to why it is cutting in and out.

Answer
Quick check;
Swap over the two speaker wires from left to right at the amp connector block. Still on same speaker? Problems lays with the amp output. As for the dodgy earth connections, unforgivable, it takes just along to do it right as to bodge it, slapped wrist and don't do it again, o.k.
If it DID swap sides, then it's the speaker or wires to it.
Run a pair of clean wires to the speaker, still the same? Swap out the speaker, that should sort it.

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Peter G. Lee

Expertise

Accessory installations including audio, security and lighting, general wiring and fault finding. Nothing specific to US car electrics such as ECUs or engine management systems please i.e. how do I get the radio out of a Saturn, we don't have Saturns in Europe so I wouldn't know.

Experience

11 years as a security and audio installer in the U.K. 9 years own company in South West of U.K. installing for a number of high street retailers incluing Trinity in-car centre, Road User, Halfords and A.1. Past advisor to and chairman of Sold Secure initative gloucestershire police. member PACT (partnership against car theft)U.K. police, Kit car builder VW air coole

Organizations
Member of the institute of diagnostic engineers M.I.Diag.E

Education/Credentials
Certified by Clifford, Cobra (U.K.) Serpi Star-Gamel, Moss, Philips, Tracker (Lowjack), Pioneer blue chip installer, Kenwood installer. City and Guilds, A.R.E

Past/Present clients
Over 2,000 between 1988 and 2000

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