Well I'm still learning the ins and outs of this system but making progress. Still have not found the location of the Front Row processor but based on the location of the remote on the side of the console I wonder if it's under there. Pulled the side hatch off the dash and dropped the glove box and no luck there or under the passenger seat (I think) Also note that I'm a combat veteran of VN and my ears are not so good any more! No ear protection in those days. The highs sounded "fuzzy" to me and since there were suggestions of checking grounds I went through all that and found the positive and negative leads at the amps to be slightly loose, tightened the set screws and the "fuzz" is gone and sound is dramatically better, at least to my ears. Now to see if the humm comes back when it's been on for some time. Again, many thanks for the help and suggestions!