Hi I’m doing basic calibration for my speakers and subs! I was wondering used a spl meter for level before and I turned my main volume on my receiver to 0 dB to measure everything. I’m using REW this time around and it wants me to turn my main volume up until my speakers hit 75db? I ran ypao to do the basic eq cause I don’t have a mini dsp or anything and set all my speaker to 0.0 after the ypao set up so I can level everything out to fit my room. I was wondering is there a difference between using 0 dB reference compared to just turning the amp up until it hits 75db. Does that mess with the volume when you watch and listen to movies and music? Also what volume does everyone listen to their content at? I usually have mine at -15db or -20db no higher?