Not sure if I have enough oomph.

with revels, it's more about having high current delivery than raw wattage--i've run mine with a 125w parasound (among many others) which does just fine. now, i don't think i've heard your krell, but reading the specs it should be more than enough--it claims to drive impedances below 1 ohm and to deliver a gazillion watts into 2 ohm.

Okay, I’m tired of reading responses here that these amps don’t have the juice to sufficiently power these speakers and who are clearly not familiar with this amp’s capabilities.  Here are some facts…

Each amplifier is capable of delivering:
160 Watts into 8 ohms
320 Watts into 4 ohms
640 Watts into 2 ohms
1280 Watts into 1 ohm

So please, stop with the nonsense that these amps are underpowered because that’s just silly, misleading, and ignorant.  I also think they could make a sublime match sonically with the Revels and would love to hear the OP’s impressions once he gets things.settled/burned in.

@paultapar 

While your amp has plenty of power, a subwoofer woofer or two can make sure you  rarely use more than a few watts. 

All the best.

OMG.  Only now, after spending $15,000 are you concerned about this?  Like purchasing a Ferrari and then thinking about the gas consumption and repairs.

Well.... in a bit you will not have to 'THINK" about not having enough power or Ooomph.  Cross that bridge if you get to it.  

My grandmother told me not to worry about something you Don't know.  Worry about those you do know about.

PS.  "New in box.."  Break them in well first.  You want ooomph.  You will probably not get that straight out of the box.