OK, so sometimes I'm SLOOOOOOOW. It just hit me the other day the relationship between db & the settings on the volume dial. If I use my SPL meter & set my reference at 75db=0 on the volume dial, then obviously at the 0 setting, I'm listening at a 75db level. But I could set the reference to be 85db or I guess even 95db=0 if I wanted. Yes?? Is there any advantage or disadvantage to setting 0=anything other than 75db?? Why did this take so long for my poor mind to finally comprehend all of this?? or have I??? hmmmmmm....