HU issue, I think its the ground but just in case...

[thegreatestpenn 5,000+ posts]

I have a JVC kd-ar880 and recently I put the 4 speakers on the HU's internal amp for power instead of my usual outboard amp. I started noticing when I turned the music up past nominal levels that the HU would crackle and not sound right. Also when turned up too high the HU would shut off. At first I thought it was because the voltage was dropping below 10V, but I tested at my amps and the voltage wasn't dropping below 12.5 except for when I burped a tone (and the HU didn't cut off on the tone either). I have upgraded the HU ground so its not coming off the factory harness but a 12ga. wire straight to the chassis. I even upgraded the 12V wire with 12ga and a 15 amp fuse (same as on the deck) from the steering column. Yet I still have the crackling. I'm thinking 2 things may be the problem:

1) My ground wasn't good enough that I ran for the new ground.

2) One of my speakers is grounding out causing the whole internal amp to have issues.

if I can't figure out what's wrong I'll just have to add another outboard amp for the speakers again (not that its a bad thing), I just am confused as to why this would happen since I've never experienced a deck do this before.

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[thegreatestpenn 5,000+ posts]

up for a little help

 

[Fiercetimbo17 10+ year member]

JVC internal amps are very very sensitive.

You either have a wire grounding out like you suspected or possibly a blown speaker with a low impedance.

Check both of those and i bet you figure it out.

 

[qkassidyw 10+ year member]

Did you used to have an external amp hooked up in that car and have you disconnected it?

I have seen this when cistomers bring their cars in and have BOTH the amp and deck's amp connected to the speakers so it results in this crackling...

If a speaker was grounding out the deck would most likely not play any sound (go into protect basically). But it is still a possibility...

 

[loopkiller 10+ year member]

I think you are getting a speaker to ground out under movement due to higher volumes. I have seen it before. When the volume is low, the speaker does not move as much as when you crank it. Inspect the speaker wires and you will likely find a bad connection.

 

[thegreatestpenn 5,000+ posts]

I think the internal amp is just fried. when I only run 2 speakers off the deck it plays "better" (as in won't cut out, only a little crackling at very very high volumes). each speaker read the proper impedence. I think its time to get back to all outboard amps