I don't know either Mojo...I like my punch with rum and slices of pineapple.

Fred, there is no hard or fast rule for setting trim. Too much depends on placement and unique room acoustics. Before using the trim control I would suggest leaving it flat and again tweaking placement. Generally speaking the closer to the corner in a small room the more trimming to half or full becomes viable. The concept being that the closer to the corner the more room gain will occur below 33hz. However depending on where you sit you could be situated in a peak or null so the only practical thing to do is try all the settings. Keep in mind that the trim that sounds good for HT may not work that well for music.

John