Ksa-100 vs mkii
I owned both the Kma-100 and the mkii (still have)..also a few ksa-50 mkii, and still have a ksa-100mkii. There is quite a difference sound wise. The mkii is a cleaner sound. More open. Very fluid upper frequencies. Both mki and 2 deliver solid krell trademark bass. The mkii has fans that vent up, not down as the originals had. As long as you blow out dust annually you should never have an issue with either. I run mine on custom elevated stands to keep ventilated and above the dusty floor. If in the market buy the mkii. This is the sound that put krell on the map.
Enjoy
Ed