I have a 775 (single disc ver.) and the crossover setting is at 120. I'm assuming that it should be the same for your changer.
I thought that was too high for my system so I just set all speakers at large and let the sub handle the bottom end. It seems to work fine.
I thought that was too high for my system so I just set all speakers at large and let the sub handle the bottom end. It seems to work fine.