I've just read a post where someone installed speakers into the rear panels, where the mounts are behind the holes, and the sound quality was so bad he's faded them out I was planning on installing a set there, but that's really put me off!! But where and how can I install them? there appears to be gaping holes in the metal nearby but nowhere to mount them. What have others done, got any pics and tips? I'm gonna give it a go on the weekend.