The speaker trim would have to be done in the analog domain, because losing the trim when going to six-channel analog would seriously hamper the usability of that input. I've never tried to use theater compensation or adjust treble or bass or do the theater compensation while using the six-channel (or any other) input -- since the manual indicates that theater compensation deals with bass/treble levels, it would make sense for it to work if the bass and treble adjustments work.

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gonk -- Saloon Links | Pre/Pro Comparison Chart | 950 Review