So I ask and I ask and I ask the best way to set the amp gains with a DSP, what is the reference volume for setting the EQ's and what not... yada yada yada. I also ask if REW already compensates for the natural roll off of pink noise on its graph... apparently it does. So in REW you ARE looking for a pretty flat response across the board from bass to midbass to mids to highs on it's graph when using a calibrated mic and setting the EQ's and crossovers and so on. So basically I just opened up a false floor in the rabbit hole and I am about to jump in deeper.
One of the things I did not have was the answer to what volume should I reference all of my settings. Now I have it. 85db - 90db.
I have the max, undistorted volume from my head unit into my DSP. 36 of 40 on the eXcelon for the 3Sixty.3 as the 3Sixty.3 wants a clean 2v input.
Now I use my test tones at whatever "-5 or -10db" to set the gains on my mids and highs amp and I will use my O-scope to set with no clipping.
Ditto for my Midbass amp
Ditto for my sub amp
Now, I will turn down the volume on my 3Sixty.3 and turn the levels down on the tweets, midbass and subs and only have my mids playing pink noise. I will turn the volume up until I have my mids at or very near 90db. I will bring the other db levels up to the level of the mids.
Now the fun can begin... Equalizing. Phasing. Time correction. After watching a video, the need to eq each individual speaker makes sense.
I know this all looks like a bunch a chatter but it makes sense in my brain with what I have seen and heard now.