Headunit broke or bad wiring?

[hoaxci5 10+ year member]

This just started yesterday and I don't know what the problem is, basicly any time I turn up the volume on my hu past 18 (of 30) all 4 of my door speakers cut in and out. First thought was bad amp, checked it with another same thing.

My subs stay on when this happens.

So is my headunit broke or is there some specific wiring I should double check?

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[blgaudio 10+ year member]

Check the ground on your amp.

 

[hoaxci5 10+ year member]

Ground is perfectly fine, even tests fine with DMM.

 

[Ctminime 10+ year member]

when somthing happend like this for me i found out that my rear speaker wire was getting pinched... with made my hu only play sub..... i would check your speaker wire and make sure that its all good....do u have a 4 channel running all of ure speakers or do u just have an amped front stage or what?

 

[hoaxci5 10+ year member]

I have a 4 channel running my doors.

I don't see how that could be the problem though since it ONLY happens when I turn up the volume.

Not saying your wrong I plan to check it, just don't know how that could be the problem.

The amp does not shut off when this happens, power stays on just no output.

 

[AcidicDreams 10+ year member]

amp going into protection mode? I know alot of home systems cut out when the volume is to high.

 

[DaveVT 10+ year member]

make sure your wires are properly hooked up.

 

[hoaxci5 10+ year member]

Wiring is hooked up correctly.

Adjusting the gains on the amp changes which volume on the hu that it stops playing at. With gain at Nom (which is below matched) it's 18ish with gain all the way down it has to be at 26ish to stop working.

Thats what leads me to the HU being bad.

Is there a way to test the RCA connections? If I hook my DMM to the two conductors on my cable I should get somewhere around 4v (alpine 9855) right?