What frequency do I crossover subs

Im intrigued by Marty's point about bass smoothness. My mains extend to about 20 Hz, but the smaller center and surrounds can't do that. How important are the center and surrounds in setting crossover? I use a Velodyne SMS-1 bass manager to control a pair of HGS-15s.

I set the initial level of all speakers to be equal with my RS SPL meter, but trim the subs 6-10 dB because they seem too loud -- I assume the meter is relatively insensitive to LF. I like the level of the subs to be such that you don't identify them as a source of sound.

I've tried 40, 60, and 80 Hz crossover settings in the Oppo 95 (analog) and Cary Cinema 11a (digital) menus. Maybe I should just standardize on 80 Hz.

db

Marty,

I confess to having used the SMS-1 auto mode, but I bought an articulated mic stand at a local music shop in anticipation of manual set up. I need to get to it. I think the SMS-1 sends video to the DVDO, so I should be able to use the small (30") TV to monitor adjustments. The SMS-1 sits on a shelf above the DVDO, so if it isn't already connected it should be easy to do.

db