bobbydd OPThe Krell was a Bi-polar output classic, able to "almost" keep doubling it’s wattage down to 2ohms, they had a bit of Class-A bias on them as well about 12w. You obviously like what this sort of amp does grunt wise.
Upgrade Krell KSA 250 to what?
Go even better with the new John Curl designed Parasound Holo JC1+ monoblocks, they do the Krell balls to the wall thing and will sound great even better than the older JC1’s did.
https://parasound.com/jc1+.php
And your Wilson 7’s (best watt/puppy made) will love the JC1+ current ability and drive, also you can switch them into high Class-A bias for even sweeter more transparent upper/mids and highs. And your on the money with them
Cheers George