Speaker distance

The BIG advantage to the XLO Test CD OUT OF PHASE TRACK is that it’s specifically for locating the speaker positions and is explained as you go along by the guy on the track as well in the booklet. It’s not obvious how to use the OUT OF PHASE TRACK so I can’t recommend a generic out of phase track unless that particular CD also EXPLAINS how to use the track for setting up speakers. If it does, I’m down. On the other hand I just explained how to use an OUT OF PHASE TRACK so you might be good to go. The IN PHASE Track is used to determine if the system is actually in correct phase/polarity only. The OUT OF PHASE track is for speaker placement.

The Denon CD does not explain (verbally or documentation) how to use the out of phase track. So your point is well taken. 

Six Feet apart center to center 
and 8 Feet listening position 

About 7.5' between the speakers and 11' from listener to speakers..

Another system is set up for about 6' apart and 8' distance.

Wilson Sophia 3's -- positioned according to the 'Golden Triangle'  - an equilateral triangle between speakers and listening position. Magic.