Just got my surround system complete today! I'm using a Yamaha rx-a710 reciever and klipchs reference r-52 speakers all around. For the sub I'm using SVS's 12" in the enclosed box. Ran the auto calibration today and everything seemed fine with the settings. But I did change all the speakers to small except the sub. And changed their frequency levels to about 78.5hz (the reciever doesnt give me an option to but it on an even 80hz). With the subs gain half way it doesn't really sound loud enough. I even changed the db's to almost full through the reciever settings. I've heard this sub shake a room before but not my small den. Any help on what I'm doing wrong. Thanks.