Speaker Cutting Out

[Timoshii]

Hey guys,
I am having a bit of a problem at the moment, would appreciate any advise possible, so I will try to explain as best I can.

Setup:
I have a Pioneer Dead Deck, with 2 stock front speakers ('94 VR Wagon) and 2 Pioneer (I think) rear speakers hooked up to the Head Unit. Also have an Amplifier and a Clarion 12' Subwoofer (just upgraded from a 10').

Problem:
Randomly, the sound to all 4 speakers will just cut out, they will stop producing sound, however the Head Unit is still on and playing, and the Subwoofer is still producing sound (basically the Sub still goes on). To the best of my knowledge its all connected ok as it was working fine for about a yearish and then one day it just started doing this.

Actions taken so far:
So far I have taken the head unit out and verified that all the cables are connected ok and that it is earthed (was a suggestion from a work colleague) however the issue is still present.

[Timmos]

My best guess would be the internal amp in the Headunit is starting to die.
How old is the pioneer headunit?

[Timoshii]

My best guess would be the internal amp in the Headunit is starting to die.
How old is the pioneer headunit?

Not that old, I could say MAX of 1 year 6 Months.

[holdenboy]

Might be the speaker wires, they could be touching together or touching metal sometimes. I know its a pain but just stake the unit out once more and re-insulate the speaker wire connections.

It could be a few other things....does it happen at a particular time? like when opening/closing a door or going over a bump?

[Timoshii]

Might be the speaker wires, they could be touchong together or touching metal sometimes. I know its a pain but just stake the unit out once more and re-insulate the speaker wire connections.

It could be a few other things....does it happen at a particular time? like when opening/closing a door or going over a bump?

No it is completely random, which also makes it hard to troubleshoot.

Also, I might have a look at that, need to go back in anyways as must have bumped the Air Conditioning Ducts or something because now no air comes out of the Vents (just the back of the console).

[StoneX]

Pioneer head units will mute the internal amp when a speaker wire is ground. You will have a wire intermittently touching the chassis. It's common that aftermarket speaker terminals touch the car as they have a bigger basket, so check that too.

[alien]

If that dont work it sounds like you have your music too loud and the head unit is getting too hot. Usually when head units get too hot they cut the internal amp to prevent damage to the unit. Usually only to the amp though because it's the priamry heat generating part of a head unit. Then once it cools down it comes back on. Maybe try move the wires away from the rear of the unit?

When i installed a Sony head unit the other day in a VR Berlina i dragged the wiring harness straight to the top of the head unit and supported by the clip below the air vents to allow heat to dissapate a bit easier.

[ScoHar]

my kenwood headunit does that when my speaker wires touch and the unit needs to be power off power on.

[shanecam81]

i had the same prob with a jvc head unit, took it out, rewired it insulating every wire again then put back in in a diff position (angled the rear of the unit up a bit) all back in now no probs

[Timoshii]

Thanks guys, I will try that all and let you all know.

My father-in-law will be helping my by testing the Head Unit, we will take it out and set it up to the test bench and run it for a bit.