I have an older car that I installed a system. I can't get the alternator noise out of the sound. It has a 1 wire 100 amp alternator if it makes any difference. If anyone can give me any ideas on what to do.
Thanks
Replies (2)
compvr15s on 04/7/2005 23:13:11
try grounding your head unit to the chasis of the car, do not use the factory ground. do you have subs and amps at alll. if no make sure your amps have good grounds, bare metal, with nothing between the two surfaces. also make sure your power cable is running on opposite sides of the car. the last two are only if you have amps in your system... alt wine is usually due to grouding issues....
swez on 04/8/2005 08:56:05
Alt noise is usually an issue with inadequate grounding of all audio devices, cheap preamp filters on the amp used or gain settings are set improperly.
1. As Comp VR mentioned, ground HU and amp(s) to bare metal floor pan for best results. This eliminates most ground loop noise issues.
2. Some amps have poorly designed preamp filters that do not block out electrical noise riding on the power cable. A better amp may/may not be something to check into here.
3. Check the gain settings on your amp. It should be pretty close to the same output voltage settings as your HU RCA's. (Ie: If the HU puts out 2.0 volts, set gains on amp to match that) If we set the gains lower than ~1.5 volts, noise is amplified along with audio signals.
Finally, on older cars, the ALT's often used a filtering capacitor from ALT's output lug to ground to run AC noise to ground. Newer ALT's do this internally via the regulator circuits and diode bridge. Not sure what you have going on here so far, but suggest you look primarily at steps 1&3 first. See what you can do in these areas first. If not enough, then we have to dig deeper into the audio tool kit.
Comments?
Swez
Thanks
Replies (2)
compvr15s on 04/7/2005 23:13:11
try grounding your head unit to the chasis of the car, do not use the factory ground. do you have subs and amps at alll. if no make sure your amps have good grounds, bare metal, with nothing between the two surfaces. also make sure your power cable is running on opposite sides of the car. the last two are only if you have amps in your system... alt wine is usually due to grouding issues....
swez on 04/8/2005 08:56:05
Alt noise is usually an issue with inadequate grounding of all audio devices, cheap preamp filters on the amp used or gain settings are set improperly.
1. As Comp VR mentioned, ground HU and amp(s) to bare metal floor pan for best results. This eliminates most ground loop noise issues.
2. Some amps have poorly designed preamp filters that do not block out electrical noise riding on the power cable. A better amp may/may not be something to check into here.
3. Check the gain settings on your amp. It should be pretty close to the same output voltage settings as your HU RCA's. (Ie: If the HU puts out 2.0 volts, set gains on amp to match that) If we set the gains lower than ~1.5 volts, noise is amplified along with audio signals.
Finally, on older cars, the ALT's often used a filtering capacitor from ALT's output lug to ground to run AC noise to ground. Newer ALT's do this internally via the regulator circuits and diode bridge. Not sure what you have going on here so far, but suggest you look primarily at steps 1&3 first. See what you can do in these areas first. If not enough, then we have to dig deeper into the audio tool kit.
Comments?
Swez
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