Run it flat. No treble, no bass and without a doubt, no eq'ing of any kind! Sub is also optional.
Only reason I say that is because I remember the first time I went to hear a set of speakers via a similar situation. They were Dynalab's and when I was done I thought they were junk. I found out later that the system was being run hot on the treble side which totally changed the way the speakers sounded. I went back at a later date and ran the system flat. To this day, Dyna's are one of the best all around sounding speakers I have heard.
Let them listen to whatever there preference is, at the volume they prefer.................then kick back and have a cold one!
