I had mine modded with a 12ft. BTG Sunset cable. "Wire is 26 AWG and has 4 wires per channel (2 signal, 2 ground). This creates a 23 ~20 AWG equivalent wire per channel." That's 48ft. of wire per channel for me. I never checked my impedance after the mod until now (since i had my meter out already) it comes in at 70ohms! This is with banana plugs, and alligator clips attached to them from the meter. I will definitely be taking off the plugs, now that I see this. I don't want to snip the cable though, I need my distance! Worst case I think I can squeeze 14-18 awg into the cups and sell the beautiful BTG cable.
Sheesh! And I thought I was driving high impedance :)