The Acoustat TNT200 has 7amp Mosfet output devices at 6 per channel. A max of 21amp peak, Krells can have 15 - 20amp output devices at up to 4 x the amount, do the math.
The TNT will drive the them ok?, but where the Infinity's load down low and in the upper mids is you need a amp with a Krell like ability to get the best out of them.
Cheers George