Turn-on noise.
 

Hi everyone!

So I have been dealing with this issue for a bit now and cannot figure out what the issue is.
I have had the car looked at multiple times by others and the problem cannot be solved.

So here it is!

Upon turn on I recieve a squeak / pop / thump through all of my speakers. The strength of which varies randomly. It can range from a tiny squeak to a rare thump sending an amp into protect.

The gear that I am using is,
Head Unit - Pioneer DEX-P99RS
Amps - Zed Leviathan, Zed Kronos

Testing done so far has ruled out certain things.
RCA's disconnected - still happens
Rear Battery disconnected - still happens
REM jumped straight off of battery - disappears

So it was thought that because the headunit was connected to front battery while amps directly to rear battery there was some kind of fluctuation. A relay was added allowing the amps to be activated by front battery - Still happens.

I have also tried a variable turn on delay to no avail.
I have gone through and tightened all of my grounds and still nothing.

Also the Zed's are post faulty chip era.

Does any one have ANY ideas at all?

So if your amps turn on first, the noise goes away?

no difference if the amp / headunit turn on first.

playing with the headunit grounds did make a difference though
its factory harness right now.

taking the ground away and relying strictly on the antennae resulted in a much more pronounced squeak/pop.
grounding to the chassis didn't make any difference than using the factory harness though.

do you have a turn on relay?
if not try adding one

I've read about blown muting transistors in some cases - whatever they are

I also have turn off pop (long story short, I had a dead short from amp speaker outputs

to ground - resulting in a blown output transistor, which is still un-repaired, so for my

front outputs I am using speaker level inputs to a LOC.... anyway ever since "tractor

pulling" my front inputs I now have turn off noise, even if I unpower the amplifier before

the head unit.

yes, a relay has been added. didn't work.

Relays add noise because of coil transients when power is un-applied from the coil... even with a protection diode

Not sure if this would help you, but, have you checked the all the grounds impedences with a DMM?
When we had a similar problem, it was cured when we changed our grounds to a new place with the same low impedance as the front battery ground.
We had 3 ground points before, all different imp., after, we had 2 with the exact same impedance and no noise:thumbsup:

thanks guys, i'm about to go out and try some of this now.


i know now that relays add noise. there is an audible click when they activate and you can hear it shut off through the speakers.

I'm having the same problems with mine, tried swapping the RCAs and that didn't change anything.