I absolutely love AQ HC power cables. Putting a AQ HC power cable on your Krell will be a game changer (1m is fine, if you can get it to work). It will also give you a bigger bang than ICs, get them later.
I know they are expensive but buy used and confirm serial nos. with AQ.
Dragon, Firebird and Hurricane high current.
I demoed the Dragon ICs and they weren't for me.