where is the best place to earth for indash front loader

[rusty]

Good Day Gents

i need some help i decided to connect my own front loader but now its distorting and makes a grensing sound when i play it loud.

I think its the earth thats poor so im looking for a lekker spot to earth it on a Astra f....

[Gouraami]

I normally go straight to the battery for both positive and negative.

The polarity of the speakers makes a big difference to sound quality.

[cyberpuppy]

There should be a grounding plate right behind the head unit.