great question Kodiak... I would have to say "The Good The Bad and The ugly" on youtube...
https://www.youtube.com/watch?v=enuOArEfqGothats my favorite, but man i've heard some incredible lows from these speakers. Tonight I switched to two channel and had to walk around my listening space to make the other subs were not playing as it went so deep. I just could not believe these cabinets could handle such lows! You need M100s, DO NOT COMPROMISE! I had the M80 on walls and what a difference, it's like JV vs NFL.
I'm really looking for new stuff to listen to as most of what i've found on the forums is just drum kicks, which are fun for about 2 minutes, lol
