Hi, All,

I own a 1998 328i with the Harmon Kardon stereo upgrade.

This system has a switch on the console that turns on and off some kind
of spatial processing which boosts the bass and alters the "stereo
image" specifically for this model of car.

Recently I have had a problem where just the bass-boost and image
"processing" switches on and off intermittently. The system works and
sounds normal when it's working, so I know the problem is not a fuse or
blown component. I suspect a loose connector, but I don't know the
location of all of the components of the system.

I know about the in-dash head unit, of course, but are there seperate
amplifiers? Is there some kind of processing unit seperate from the
head unit?

Thanks for any info or hints!

Ken