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Old 07-28-2011, 08:50 AM   #1 (permalink)
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Default Rear Speaker Short

Hey guys,

Just installed a new head unit, front speakers and rear speakers.

Rear speakers are Kicker 6" mini-subs.

A few weeks after the head unit installation, the head unit's auto-protect feature started going crazy. Cutting the wiriing to the rear speakers was the only solution that allowed the head unit to continue working.

The head unit's auto-protect turns on when it detects a short in the system.

If such a short exists with the rear speakers, where is the most likely point that the wiring will fail in the car?
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Old 07-28-2011, 10:22 AM   #2 (permalink)
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Subs are often a different impedance than normal speakers. Check your impedances and what they should be. Its possible the head unit is expecting an 8ohm speaker, sees a 4ohm sub and says its a short.
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Old 07-28-2011, 10:29 AM   #3 (permalink)
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Did you still get a short when you just disconnected the rear speakers?
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Old 07-29-2011, 09:47 AM   #4 (permalink)
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No more shorts after disconnecting the rear speakers, that's why I've isolated it to a rear speaker / wiring fault.

Interesting idea about impedances, I'll check out the specs of the kickers vs some normal midbass drivers.

It's funny though, when I had the old factory deck with these speakers, I had no issues. When I first installed this head unit, I went a week without issue. Then all of a sudden, after a long road trip, I started getting into this "protect" mode. That's why I'm more leaning towards wiring vs. speakers. Additionally, at first, I was able to reset the head unit and it would play properly for awhile, as in another week or two. Most recently though, before I disconnected the rear speakers, it would only last 5 minutes under motion. The symptoms got progressively worse. I also noticed that even when the rear speakers were connected, there was no sound coming out of it. When I first installed the head unit, all speakers worked fine.

At the end though, I could reset the head unit and play it indefinitely if the car was still though, but with sound only coming from the front speakers.

If it was the speakers, shouldn't I have seen the fault right away? How would I be able to have a week of usage without this problem?
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