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I have tried to wire a sub and amp to my kdc-w311 head unit when connecting the power atenna the head unit stoped and displayed PROTECTION wat do i do?

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I would try and make sure that the power antenna is grounded like it should be!

Posted on Dec 07, 2008

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Hello nfox1987,

First you need to determine if the amp is defective or if something else is causing it to go into protection, most often a short in the sub or amp wiring.

Disconnect the sub(s) from the speaker output terminals and the RCA inputs from the head unit, and test if the amp powers up OK. If it does, the problem is in the sub(s) wiring or voice coils, or in the RCA inputs to the amp. Reconnect each one-at-a-time to determine exactly where the short is and repair or replace the defective wiring or unit. If it doesn't power up with the inputs and sub(s) disconnected, the amp itself is most likely defective.

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