A decent power amp is a huge difference.
I have M80s myself, lucked out and found a pro amp{crest Audio}cheap. My audessey had set the M80s at full range. Which only just found out, couple days ago remodelling after Christmas.
Had no Idea just lots of clean powerful bass.

Hope your new 100s play as good with your amps as the M80s did.
Just give those beauties as much clean power as you can.

The wait will soon be over.

Cheers
Brendan