Krell Amps/preamp listeing levels -- room size

What are some of your experiences using Krell electronics -- size of amps (Watts), type of speakers, room size and listening at say average volume of 75 - 85 db. What are some of the best combos out there and why. Remember listening @ 75 db avg whether its a 100watt amp or a 900 watt amp or a 30 x 40 ft room or a 12 x 15 ft room, rock classical, anything avg 75 to 85 dbs.
Lets talk people! no ifs -- list your stuff and tell us why. Old stuff and new stuff. Have some fun. Keep it simple and to the point.

KPS-28C, FBP-200C, KCT, Krell Lat-2s
Sounds nice and full at around 60 db and above (higher the better) I have never maxed out my amp! Low level listening is not the greatest -- sounds thin! (KCT volume knob (0 to 150) -- 25 is good -- 55 is loud -- 80db to 90+ db) (Room size 15 x 20)