STOP!
You will not learn ANYTHING by A-B'ing speakers in the manner prescribed. Nope! Won't help.
If you are seeking to find which pair of speakers pleases you most, by swapping between two(or more!) pairs for a few minutes at a time, you are sadly misdirected.
Think about this: If you are trying to find which sexual partner pleases you most, would you put each in a bed and jump between beds for a few minutes at a time? All in one night? Didn't think so.
Here's how you do it: Play one pair for a whole week, move them around, find the sweet spot, listen for long periods with varying sources and media. Take a break, listen to nothing for a couple of days, then look back on your last listening experience, what was your big 'take away'?
Repeat this process for each pair of speakers.
YES! It takes a long time!
Yes! It will be rewarding in the end.
I can't tell you how long it took me to 'find' my favorite speakers(Snell C/v's). I had long, intimate relationships with horns and ribbons, just to learn I prefer mainly soft dome and some really well presented metal dome mids and tweeters. Your results will vary. I can appreciate horns and paper cones, sure. It's a process. Don't try short cuts. A-B'ing just doesn't cut it for truly understanding the nuances of speakers.