Could you elaborate more on how you grounded your balanced inputs? I am using a peripheral electronics SVEN4 to convert my wire outputs to RCA. Do I still want to use the battery as ground for my amps? My SVEN4 unit (comparable to the OEM-1) is not grounded.
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Originally Posted by digitaljok
Brilliant thread, just in time because I installed my Stealthbox and Zapco i-250 amp this week and am getting very low frequency high excursion noise that looks like it will kill my woofer if I don't get rid of the noise. In my case, I'm using speaker level balanced differential inputs on the Zapco amp so no need for a line output converter. I also thought that balanced inputs would be better for noise rejection but I was wrong. Anybody else use speaker level balanced inputs on their Zapco or JL amps?
I wasn't sure at first where to ground the balanced input signal so I called Zapco and the guy said to ground to the amp chassis. He said that was the signal ground and was not the same as grounding to the car chassis. Our stock amps are not easily accessible, so I figured the top amp mounting bolt would be good enough as a amp chassis ground. The noise did get quieter, but is definitely still there. I can hear the cabin lights dim!
Does anyone know if the amp mounting bolts and tabs are conductive enough to be used as grounds? I'm not sure what the amp really looks like because I've never taken it completely out, so maybe there's a better spot to connect to the amp chassis? Better yet, is there a wire from the amp that is acting as a grounding wire that I can tap into? Some previous posts listing the amp (non DSP) pinouts are a little confusing.
I was going to try using a line output converter to see if that would get rid of the noise, but I can see here that people still have noise problems with LOCs.
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I used PAC-SNI-35 before the SVEN4, the quality was crap but there was no noise. Ever since I added the SVEN4 I introduced a ground loop. I am not sure if I had it all along and the better quality of the SVEN4 just makes it easier to hear or what. I had the PAC-SNI-35 connected to my factory outputs (removed stock amp) and used them to convert to RCA. My SVEN4 is currently setup like this, my ground loop doesn't exist if I plug my ipod directly into the amps and disconnect the head unit/sven4 rca's. I am thinking my problem is:
1. Ground location but from the looks of this thread I think I am ok
2. Factory head unit is using stock ground, I may change this
3. SVEN4 is picking up interference, I am in the process of extending my factory outputs and moving the SVEN4 far away from the trunk area.