Hi guys,
Does anyone have any more info on this, or a fix that works... I tried chnaging my amp in the footwell a little while ago and thought this had sorted it but it didnt
Im looking at getting a replacement head unit but does anyone have any advice on this in the meantime, otherwise I think I will just admit defeat and disconnect the smaller speakers/tweaters in the doors for now as its driving me mad!
Thanks
Hi,
The buzzing is probably caused by a ground loop between the head unit and external amplifier. As long as it isn't a fault in the head unit itself, the fault is probably in the wiring so replacing the head unit many not fix it.
The ground loop forms when two pieces of equipment are grounded at different levels. This allows a small current to flow between them on the signal interconnect which due to the sensitive nature of this causes the unwanted signal to be heard in the Audio.
Both the head unit and amplifier are connected to the same grounding point but there may be corrosion or dirt on an interconnect or junction that affects the earth on one of the two.
I used to have buzzing problems with my head unit and BOSE amp so it affected all speakers. The problem was the head unit as movements to the head unit would effect the level greatly. When it was bad it sounded like the car had a very large supercharged engine and moving the head unit normally fixed it. A previous owner broke the retaining clips off so it would slide out on hard acceleration!
Fitting my XCarlink unit fixed both problems for me. I wired the XCarlink directly to the body earth point (by the passenger front door hinge) and it has a connection to ground the head unit to its earth. When I did this, the buzzing stopped and has never returned. It has also fixed my radio in place as the extra cables stop it sliding out!
I would suggest first cleaning all the connectors on both the head unit and amp with electrical contact cleaner. If the problem persists, try earthing the head unit case with a test lead connected to to a known good earth (e.g. by passenger door hinge). If this still doesn't fix it, try earthing the radio supply ground, thick brown wire on the 8 pin black connector. If that doesn't work you could try the effect on the signal earth.
The following post shows details of the audio system and connections.
http://www.a2oc.net/forum/showthread.php?24226-Upgrading-rear-speakers&p=190087#post190087
regards
Andrew