If your center channel has good enough woofers, I would recommend setting it to LARGE. I have found that male voices have a deep bass/texture that actually comes out better through the center channel. It's more cohesive. The subwoofer has timing issues and those types of sounds are generally not crisp enough when coming from the subs.
Also, try bumping up the calibrated level on the center channel 1 or 2 clicks in the Bryston SP3 speaker setup. This can have a significant effect on how well you hear center channel dialogue! I have needed to do that even after a individual speaker calibration using a db meter.
Also, try bumping up the calibrated level on the center channel 1 or 2 clicks in the Bryston SP3 speaker setup. This can have a significant effect on how well you hear center channel dialogue! I have needed to do that even after a individual speaker calibration using a db meter.