Have you considered purchasing the MIT oracle interconnects they have a three step impedance variation switch so you can match any preamp and amp combination. I only went this route as I wanted to run a tubed preamp ARC MRKIII with Krell FBP 750MCX mono blocks and Krell requires you to return the amps for a factory MOD in order to mate them with a tubed preamp. Oh and please put aside the stigma regarding the MIT networks these interconnects sound incredibly sublime.
Definitive
Definitive