It's one of the following:

a) My ears are fried, from too many hi-decibel evenings.
b) I don't have it hooked up right.
c) I don't have it calibrated properly.
d) My speaker placement isn't to the exacting standards required.
e) I got sold some bum gear.
f) This SACD surround sound deal isn't all it's cranked up to be.