I have a 93 Touring and first off, I know the Bose systems that come in these are highly prone to issues. I have searched the forum for Bose, buzz, humming, ... and only found one (davesan1) user who had the same issue, but nothing useful was in the post.

Something worth noting is that my power antenna died and just recently my rear wiper died too. Would that have something to do with it?

Is this a known issue (aside from the known fact the entire Bose system is problematic)?
Can I just disconnect the rear speakers?

I can post an MP3 of the sound if people think it will help