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Old 04-24-2018, 07:46 PM
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I have a Kicker ZX350.4 (4 channel) amp running to a component set up front and a coaxial set in the rear.

Pioneer X930BT Head Unit - RCA jacket to HU chassis measures at 0.1 ohm for the front and rear chanels. Actually, it measure 0.2 then after a second and then it settles on 0.1. The subwoofer pre-outs measure 0.1 for a second then settle on 0.0 ohm.

I have short runs from battery to the amps. Very short ground run that is a good ground. All paint removed, solid lug through the chassis floor. On top of making sure it is a good ground, I've also tested this amp at factory Ford ground points, and at another sanded bolted location, and the noise was still there.

The amp was tested by Kicker and they couldn't find any issues.

AVIC X930BT
Kicker 750.1 > Infiniti Kappa Perfect 12.1 (Both removed from install during troubleshooting)
Kicker 350.4 > Component front, coaxial rear
Good ground for head unit, directly to vehicle chassis (also tested using the harness ground)
Good ground for both Amps, directly to chassis,

1)Kicker 350.4 with just a RCA to 3.5mm jack > Andoid phone = no engine noise
2)Kicker 350.4 with short RCA cables (i tried 5 different sets) held right up in the air = much less noise
3) Kicker 350.4 makes some noise with RCA cables plugged in. With no cables plugged in = no noise
4) Kicker 350.4 with the routed RCA cables (the don't run next to the system power cables and are not touching the chassis) that I installed originally - tons and tons of noise.
5) Grounded the shields of the RCA jacks to the HU chassis. NOISE WAS WORSE

So if I just hook up my RCA to 3.5 mm to the amp, no noise (no head unit connected)

If I hook up a 12 foot lock RCA cable to the amp (no head unit connected), and hold that in the air, there is still noise. If I string it along towards the rear of the vehicle the noise is still present, but it changes in sound a bit. On this 12 foot RCA cable, that I'm holding in the air and no hooked to the HU, even if I add the noise filer to the line still makes noise. If the line filer lays flat on top of the amp the noise almost goes away, but if I hold the whole assembly in the air it makes noise. so strange.

If I hook up a 4 foot RCA cable to the amp (no head unit connected) and hold that in he air - NO NOISE. However, if I hook that 4 foot cable up the the head unit, the noise is there.

Thoughts?
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Old 04-24-2018, 10:43 PM
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Is it ground loop noise?

Have you tried new RCA's?

Have you ran a ground from the HU to the ground the amps are using?
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Old 04-25-2018, 10:31 AM
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Quote:
Originally Posted by charles.beener View Post
Is it ground loop noise?

Have you tried new RCA's?

Have you ran a ground from the HU to the ground the amps are using?
It's noise that matches the engine RPMs, is that considered ground loop noise?

I did try to ground the chassis of the HU to the amps and it didn't make a difference. I will try it again though. I might just put it back together and finish testing in TX. I'm trying to finish my van build and move out in the next 6 days lol.
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Old 04-25-2018, 10:34 AM
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Quote:
Originally Posted by ohmboy View Post
It's noise that matches the engine RPMs, is that considered ground loop noise?

I did try to ground the chassis of the HU to the amps and it didn't make a difference. I will try it again though. I might just put it back together and finish testing in TX. I'm trying to finish my van build and move out in the next 6 days lol.
That is ground noise. I would run a ground connected to your HU wiring harness ground to the same ground your amp uses.
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Old 04-25-2018, 10:31 PM
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Quote:
Originally Posted by charles.beener View Post
That is ground noise. I would run a ground connected to your HU wiring harness ground to the same ground your amp uses.
I did that. Noise is still there. Here is the head unit ground (on a factory ground), with the tie in to the amps pictured. Any other ideas?





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Old 05-06-2018, 07:15 PM
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i had a bad whistle once and it was the radio rca port. switch the rca and see if it stops. if not try a different rca cord. this solved my problems
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Old 06-09-2018, 08:57 PM
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I would try a new set of RCAs first. If the problem persists, it could be a problem with the HU. Pioneers are notorious for blowing their PICO fuse and causing a ground loop-like noise.
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