I'd suggest you call Krell and ask, as well as whether they bridge the amp to create the monoblock or do it another way. Given my recollection of the KSA 150 vs. the MDA 300s and the KSA 80 vs the KMA 160s, I would think that the amps are not bridged, as the bass control of the monoblocks was superb (of course, so were the stereo versions as well).
Does Krell still convert KSA 250 into MDA monoblocks
I have a KSA 250, and would like to purchase another one if Krell, or someone is still able to convert them to monoblocks... any help would be appreciated. Maybe a private shop would do it if Krell doesn't anymore...