ok, loaned out the db tester from work today and did some tests.
with side panel removed and prode right next to hard drive cage, fan speed 850rpm = 38.8db
with side panel installed and prode directly in front of the 'intake slots', case fan speed@850rpm = 36.3db
with side panel installed and prode directly in front of the 'intake slots', case fan speed@600rpm = 34.7db
with side panel installed and prode directly in front of the 'intake slots', case fans 0ff = 33.9db
with side panel installed and prode by rear fan grill, case fan speed 850rpm = 35.6db
with side panel installed and prode by rear fan grill, case fan speed 600rpm = 35.2db
with side panel installed and prode by rear fan grill, case fans off = 34db
case fan speed@850rpm for all these tests:
prode about 6 inches from case = 33.1db
prode 3 foot from case = 29.9db
prode 11 foor from case = 29.8db
no change durring file fransfer could be detected.
xbox360 idle rear of system = 48.3db
xbox360 idle bottom air vent = 44.4sb
gamecube 1 inch from input fan = 44.8db
playstation2 with 80gig seagate hdd = 49.2
xbox with 40gig wd hdd = 44.2 & over 50db durring seek
microsoft wireless multimedia keyboard 1.0a & wireless optical mouse 2.0:
dragging mouse over mouse pad causes bewteen 40-45db from 3" above
mouse 'click' from 3" above 40db
keyboard typing ranged between 45-50+db from 3" above
(i'm finding this db meter to be rather amusing)
