Ok, So somethings been bugging me since I contemplated using an SPL and setting to 75dB. First let me explain, in hifi world I was always concious of never over running the AMP and tried not to run the standard volume control past half. So, now on to SPL setting. So according to you all i'm supposed to set my amp to 00dB and then play the test tones. What concerns me is this is FULL volume on my Yamaha. Is this ok? Mark.