Krell Duo 300 compared to Evo 302e or 402e?

I just got a Duo 300 for home demo. It certainly adds texture and makes the music more engaging. But, I like the exact, analytical nature of my 400e (and former 302e), so, Duo sounds a bit too colored. The evolution series seems to have more control of the bottom end than Duo. I need to listen and compare a bit more. Maybe it needs some burn in time to tighten up the sound.
By the way, I thought it was odd that hot air blows out through the top. I don't know if anyone would want to put anything on top of Duo as Krell suggested it can be done.

Since its introduction, Krell adjusted Vanguard retail price to $4,500. So, it is not as a strong bargain as it seemed initially...