Issue again, ground loop noise back

Poppinjay · 07:20 PM

Hi,

Sorry to ask for advice again. Prob easier starting new thread.

So I have a Pioneer headunit, Hertz Millie Pro fronts bridged off a Hertz HCP4, twin JL Audio subs running off a JL Audio 1000.1 amp. Amps share the same ground through distribution block

I have spent two weekends trouble shooting a slight hiss and static in the car.

I think I have figured out whats causing it I just need to know the best fix

I removed my HID headlights thinking this was the issue, but no. My power cables are routed down the left side, Rca's down the middle and speaker wires on the right. Mounted a new ground, mounted both Amps to MDF before fitting to the seats to insure there not direct contact with metal.

So, it would seem If I remove the RCA ( amp end ) on the sub amp i get alot of ground loop noise through the components, plugging them back in its virtually gone.

Whats the best fix for this issue.

Much apreciated

Btw I have tried a ground loop isolator but no effect.

Poppinjay · 19th October 2020, 10:58 AM

Anyone have any suggestions as need to look at parts today if needed

synonymous · 19th October 2020, 11:06 AM

You get noise when the RCA are removed?

Guessing that you have at least 3 RCA connections
Try removing them all on the amps and connecting them individually, each alone, then in combinations.

Poppinjay · 19th October 2020, 11:07 AM

Cheers, will try that shortly

jan.didden · 19th October 2020, 02:58 PM

Running anything with the input left open will almost guarantee noise and/or hum.
Why do you run the stuff with the input open??
And how do you know it is ground loop noise?

Jan

synonymous · 19th October 2020, 03:19 PM

Quote:

Originally Posted by jan.didden

Running anything with the input left open will almost guarantee noise and/or hum.

Typo?

Poppinjay · 19th October 2020, 04:47 PM

Im just running tests in the car due to a little interference from the electric windows when I adjust them i get static noise, so just ruling out and possible issues

18th October 2020, 07:17 PM	#1
Poppinjay diyAudio Member Join Date: Aug 2018	Issue again, ground loop noise back Hi, Sorry to ask for advice again. Prob easier starting new thread. So I have a Pioneer headunit, Hertz Millie Pro fronts bridged off a Hertz HCP4, twin JL Audio subs running off a JL Audio 1000.1 amp. Amps share the same ground through distribution block I have spent two weekends trouble shooting a slight hiss and static in the car. I think I have figured out whats causing it I just need to know the best fix I removed my HID headlights thinking this was the issue, but no. My power cables are routed down the left side, Rca's down the middle and speaker wires on the right. Mounted a new ground, mounted both Amps to MDF before fitting to the seats to insure there not direct contact with metal. So, it would seem If I remove the RCA ( amp end ) on the sub amp i get alot of ground loop noise through the components, plugging them back in its virtually gone. Whats the best fix for this issue. Much apreciated Btw I have tried a ground loop isolator but no effect. Last edited by Poppinjay; 18th October 2020 at 07:20 PM.

19th October 2020, 02:58 PM	#5
jan.didden diyAudio Member Join Date: May 2002 Location: Westende Resort, BE coast	Running anything with the input left open will almost guarantee noise and/or hum. Why do you run the stuff with the input open?? And how do you know it is ground loop noise? Jan __________________ Linear Audio - Articles - SilentSwitcher - Treg hi-voltage regulator - Hi-voltage delay unit - AutoRanger

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19th October 2020, 10:58 AM	#2
Poppinjay diyAudio Member Join Date: Aug 2018	Anyone have any suggestions as need to look at parts today if needed

19th October 2020, 11:06 AM	#3
synonymous diyAudio Member Join Date: Oct 2007 Location: Charleston SC	You get noise when the RCA are removed? Guessing that you have at least 3 RCA connections Try removing them all on the amps and connecting them individually, each alone, then in combinations.

19th October 2020, 11:07 AM	#4
Poppinjay diyAudio Member Join Date: Aug 2018	Cheers, will try that shortly

19th October 2020, 04:47 PM	#7
Poppinjay diyAudio Member Join Date: Aug 2018	Im just running tests in the car due to a little interference from the electric windows when I adjust them i get static noise, so just ruling out and possible issues