08-01-2012, 11:13 PM
The rear out will be a very "dull" sound in comparison to the front. If you have front speakers in then ignore me but what I'm suggesting is swap it over as an experiment to see if the problem continues. If it doesn't, that channel is your problem and therefore you need a new HU.
Team Eaton
1999 China Blue 306 GTi6 - Eaton Supercharged - 214.5bhp 181lbft
1999 China Blue 306 GTi6 - Eaton Supercharged - 214.5bhp 181lbft