i must say that those SPLs of mine have been taken while all speakers were active: 7.1 (minus a center front which i don't use).

also, the SPL meter used is a semi-pro model that is user calibrated.
the numbers i gave for wattage were much more approximations.
a good meter to measure that is costly, so it's not worth it for me to buy.

See: http://www.blu-ray.com/community/gallery.php?member=Gelli
or: Axiom Gallery