GIL Shoemaker
New Member
Here's the scenario:
I installed an Alpine CDA-9833 HU with a CDA-S634 CD Changer into my '92 SHO. The rest of the system is still stock so I'm still using the factory JBL main amp, sub amp, main speakers, and subwoofer. The HU is connected directly from the RCA connectors to the factory wiring harness. I wanted to keep the amp inputs at low level to maximize the sound range instead of messing with a speaker level to low level converter. (I made the RCA to factory harness connectors myself by soldering RCA ends to an aftermarket radio to factory harness adapter.) Unit puts out great sound - highs and general sound is much clearer even though I am still using the factory JBL speakers as well. The problem is that I am getting a pop/small boom (annoying, but not really loud/bad) feedback through the main speakers from the HU when it is switching sources, i.e., changing from disc to disc, or disc to radio tuner, etc.) and sometimes it is from track to track on a disc.
I read on some of the Mustang boards that this is caused by the common ground for the radio and speakers in Fords and that a resistor placed inline with the HU remote turn on line to the amps can help fix it. I tried doing that, but the resistor just dropped the voltage so low that the amps wouldn't turn on. I also remember something, like the aftermarket units put out a 4V output on the remote turn on and the Ford JBL systems need a 2V or something like that. Anyone actually tried something like this with a SHO? Any advice would be appreciated. Thanks.
- Gil
'92 Green
I installed an Alpine CDA-9833 HU with a CDA-S634 CD Changer into my '92 SHO. The rest of the system is still stock so I'm still using the factory JBL main amp, sub amp, main speakers, and subwoofer. The HU is connected directly from the RCA connectors to the factory wiring harness. I wanted to keep the amp inputs at low level to maximize the sound range instead of messing with a speaker level to low level converter. (I made the RCA to factory harness connectors myself by soldering RCA ends to an aftermarket radio to factory harness adapter.) Unit puts out great sound - highs and general sound is much clearer even though I am still using the factory JBL speakers as well. The problem is that I am getting a pop/small boom (annoying, but not really loud/bad) feedback through the main speakers from the HU when it is switching sources, i.e., changing from disc to disc, or disc to radio tuner, etc.) and sometimes it is from track to track on a disc.
I read on some of the Mustang boards that this is caused by the common ground for the radio and speakers in Fords and that a resistor placed inline with the HU remote turn on line to the amps can help fix it. I tried doing that, but the resistor just dropped the voltage so low that the amps wouldn't turn on. I also remember something, like the aftermarket units put out a 4V output on the remote turn on and the Ford JBL systems need a 2V or something like that. Anyone actually tried something like this with a SHO? Any advice would be appreciated. Thanks.
- Gil
'92 Green
