Couple points to add to this discussion....
Changing the trim on the sub or the AVR will not alter what Audyssey has done unless you are using Dynamic EQ/Dynamic Volume. Both of these depend on the speakers being calibrated to 75 db.
Second, what your drummer friend may be used to hearing is a bloated midrange (think Honda Civic boom-booming up the street). What you get with Audyssey is a flat response. This is something most folks are not used to hearing. Think of your experience at a better movie theater and compare what you hear at home with that.
