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JL Audio A1400 monoblock class D amp issues

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Needing a little help with figuring out how to resolve this new issue I'm running into while hooking up my JL A1400 class D monoblock amp?¿ Whn I power it on it lights up n turns on with the exception of giving me a solid green light, instead it's giving me solid green n red protection lights n has this God offel highpitched sound coming from the sub channel, I have looked over the board to check to see if something has popped or blown up but am not seeing anything of the sort. If anyone has any knowledge of how to diagnose or resolve this issue it would be greatly appreciated. N Thank you in advance to whoevr is able to respond to this k I go by Matt 

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