stevea11757-
What's your budget? I have used the Sain Line Systems "Pure Audio Cables" line of power cables on the Ref 5SE and it is outstanding. They are a steal used if you can find one but they don't come up for sale very often. I believe they are around $1500 new but don't quote me on that. I have also used the Nordost Valhalla V1 PC on the Ref 5SE and that is probably my favorite. Either of those two are outstanding though.
Also, I would recommend VooDoo cable 15A to 20A adapters if you don't want to buy a 20A terminated cable. They are excellent and I can't hear any loss of sound quality.
What's your budget? I have used the Sain Line Systems "Pure Audio Cables" line of power cables on the Ref 5SE and it is outstanding. They are a steal used if you can find one but they don't come up for sale very often. I believe they are around $1500 new but don't quote me on that. I have also used the Nordost Valhalla V1 PC on the Ref 5SE and that is probably my favorite. Either of those two are outstanding though.
Also, I would recommend VooDoo cable 15A to 20A adapters if you don't want to buy a 20A terminated cable. They are excellent and I can't hear any loss of sound quality.