I have a Yamaha 995 receiver and it doesnt display the db level like other receivers. So basically using my Radio Shack SPL Meter I would use the volume control on my receiver until I get a 0 reading(12o'clock)on my meter at the setting of 75db for my main speakers first. Then I would adjust the other speakers to get a 0 reading and then adjust the sub a little higher than the others. I am using the Avia test disk to do this. I am doing this correctly?