Should work fine. Krell and Levinson amps, from what I've heard work well. The krell should have the grunt the Vandersteen's require. A lot of people match these speakers with lesser electronics, which is a mistake. You will be rewarded for the better stuff.
I personally use a Theta Dreadnaught 4-ch in a biamp configuration with the 3A Sigs. This amp was highly recommended in the Audioperfectionist Journal. After living with the amp for several months, it is everything Hardesty says it was. He replaced a pair of Levinson 33H monoblocks with this amp. Now, that's saying something.