Sound system trouble

[patmckinneyracing]

Alright I just got finished running that second ground wire going from the capacitor to the body of the car. Man that system is kicking really hard now! lol. So I guess that ground cable was definately the missing link in getting this system to work.

 

[84GP455]

I knew it was your problem when you described how you grounded the cap to the amp! Well CRANK IT UP MAN is that freedom rock man??? enjoy going deaf,,.... I'm already there! 😱

 

[Phoenyx]

Phoenyx....isolating the grounds from each other can easily cause a loop

"A ground loop occurs when any piece of equipment or any incoming wire is connected to a different ground or grounds. If your in-dash receiver and amplifier are grounded to different locations, for example, a ground loop may occur. In this situation, the multiple ground paths can, in effect, act as an antenna for interference. The interference is turned into noise, and you hear it in your system."

Well the amps should be grounded separately. I have done many installs and repaired a lot of 'professional' installs.

Here's something I found on a car audio site:

VII. Keep amplifier power ground wires as short as possible. The longer a wire, the more resistance it has. When a current flows through a resistance, a voltage drop is produced. Because of this, the ground reference at the amplifier's circuit board is no longer the same as that at the chassis of the vehicle. This ground potential differential can lead to noise and improper operation of the amp.

VIII. Don't connect all of your amplifier ground wires under one bolt. Contrary to belief, this is not required if the rest of the system is installed properly. If you do connect more than one power ground wire under a single bolt, you run the risk of amplifier ground modulation. This is caused by the current demands of, for example a woofer amp, modulating the power ground wire of a tweeter amp. This results in a squeaking noise that can be heard over the tweeters whenever bass notes hit.


Here's a link to the page.

http://www.termpro.com/articles/noise.html