I'd recommend you try out the DH labs BL-1 interconnects and T-14 speaker cable. I'm using this setup with my 300i feeding a pair of B&W 802 S3's.
cables for Krell KAV300i
Does anyone have any suggestions for cables and interconnects that will help to smooth out the aggressive highs on my Krell KAV300i? Are aggressive highs just the sonic signature of this integrated? Would the Plinius 8150 be better? My system consists of the Krell, a Rega Planet CD player, B&W 602's, Kimber Hero interconnects and Kimber 4tc cables.