I'm going to guess you have some processor specific EQ program. You're dealing with probably what 32ch of audio in addition to maybe 4 LFE channels (assuming you're not an atmos or imax theater). You could measure each channel individually assuming you were able to adjust EQ/delay manually for the system. You'll probably not be able to use rew for any group timing tests. You'll also only be EQing for a single seated position.