I have a pioneer sub hooked up in my 2008 wrangler with a built in amplifier. Done professionally. Occasionally when I accelerate the subs cuts out for few seconds. The blue light stays on. It will also do it in park when i rev the engine. I had them check thier work and he says its the preouts on my stereo not the grounds. Is that possibe? I just need some opinions before i drop 300 on another head unit.
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That's certainly an odd problem. Not many factory Jeep radios had preamp outputs so it's possible the sub is connected to the radio's speaker outputs and not dedicated preamp outputs. Check to see if any other speakers cut out. If they do, the problem is either in the radio itself or the wiring to the speaker(s) that cuts out. If only the sub is having problems, try running new signal cables from the head unit to the sub's inputs to rule out wiring problems. It's a longshot, but also check the alternator's regulator and voltage output as the engine revs - there's the possibility that the voltage is not being regulated properly and that's causing the sub to go into protection mode.
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