Whine when using the C6 low level output mod?
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Cruising
Joined: Aug 2007
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Whine when using the C6 low level output mod?
Performed the low level output mod from the thread below in my 07 Z06 with NAV:
http://forums.corvetteforum.com/show....php?t=1844206
Stripped a little insulation from the front 4 wires and soldered in my RCA cable. Installed power for the amp directly from the battery in the car, used the 10mm bolts to secure the terminals there. The only connection that was "rigged" was the remote wire - I temporarly jumped it from the B+ on the amp since I had not run it yet and wanted to test out the system. I am using a Fosgate mono amp (300M?) and the system whines like crazy when the car is running. The whine seems to be coming from the front speakers, like it's being backfed from the amp. When I unplug the RCA's the whine is gone.
Other details -
I have 2 guage main power wire to dist. blocks, then 4 to the amp.
The RCA cable is a shieded Monster cable and I ran it down the center consol to the back of the car. I am using a 10" fosgate HX2 sub.
Any ideas?
http://forums.corvetteforum.com/show....php?t=1844206
Stripped a little insulation from the front 4 wires and soldered in my RCA cable. Installed power for the amp directly from the battery in the car, used the 10mm bolts to secure the terminals there. The only connection that was "rigged" was the remote wire - I temporarly jumped it from the B+ on the amp since I had not run it yet and wanted to test out the system. I am using a Fosgate mono amp (300M?) and the system whines like crazy when the car is running. The whine seems to be coming from the front speakers, like it's being backfed from the amp. When I unplug the RCA's the whine is gone.
Other details -
I have 2 guage main power wire to dist. blocks, then 4 to the amp.
The RCA cable is a shieded Monster cable and I ran it down the center consol to the back of the car. I am using a 10" fosgate HX2 sub.
Any ideas?
Last edited by TXZ0C6; Dec 3, 2007 at 09:00 PM.
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From: WayTooCloseToNY Northeast PA
Thread Starter
Cruising
Joined: Aug 2007
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Last edited by TXZ0C6; Dec 3, 2007 at 09:09 PM.
Pro
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From: WayTooCloseToNY Northeast PA
Yes, but try the ground wire first, since isolators sometimes reduce signal voltage as a side-effect of what they do.
Click here.
Click here.
Thread Starter
Cruising
Joined: Aug 2007
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Yes, but try the ground wire first, since isolators sometimes reduce signal voltage as a side-effect of what they do.
Click here.
Click here.
Do you just tap into the gnd wire at the radio and tie it into the ground at the amp?
Le Mans Master
Joined: Jun 2004
Posts: 9,289
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From: Skippack PA
St Jude Donor '13
Normally you're only going to hear a ground loop/alternator whine when the engine is turning. I clipped the head's ground wire and tied it off to only my new ground for the amp to eliminate multiple ground points.
Pro
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From: WayTooCloseToNY Northeast PA
Cut it at a convenient point where it can be re-spliced later, and run it ONLY to the amp ground location.
When ground loops exist, they exist whether the car is running or not. When the car is running, you're hearing the alternator's AC generation sneaking into the audio path provided by the multiple ground potentials.
When ground loops exist, they exist whether the car is running or not. When the car is running, you're hearing the alternator's AC generation sneaking into the audio path provided by the multiple ground potentials.
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Le Mans Master
Joined: Jun 2004
Posts: 9,289
Likes: 16
From: Skippack PA
St Jude Donor '13
You will not lock the radio. I've had my NAV unit disconnected completely and the negative post on the battery disconnected more times than I can remember at this point and never had any trouble.
Le Mans Master
Joined: Nov 2004
Posts: 8,718
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From: Dyer IN
Cruise-In IX Veteran
here is what i have started doing on every C6 after having alt wine issues on a few cars. I connect my 4 positive rca leads like normal, but off the rcas i take all the negatives combine them together and ground it to a screw on the headunit chassis, and no noise at all. Ive done my last 3 C6s this way, and ive had to do this on someone elses car after tehre install because they had horriable noise and this fixed the problem
Heel & Toe
Joined: Sep 2007
Posts: 22
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From: Copperopolis California
hey pentavolvo
thanks for the reply... just trying to visualize this: going into the 4 rca jacks that are routed back to the amps, you've got the 4 positive leads tapped from the hu low level outs, and you've got 4 "negative" leads that are summed and connected to the hu chassis? do you just leave the 4 negative leads tapped from the hu low level outs hanging, or are those also attached into the rca jacks?
many thanks,
Dave
thanks for the reply... just trying to visualize this: going into the 4 rca jacks that are routed back to the amps, you've got the 4 positive leads tapped from the hu low level outs, and you've got 4 "negative" leads that are summed and connected to the hu chassis? do you just leave the 4 negative leads tapped from the hu low level outs hanging, or are those also attached into the rca jacks?
many thanks,
Dave
