I tried the signal cable digital cord on my Trivista DAC. After a week it still sounded so thin and cold (non-musical to my ears) that I got rid of it. The Signal cable magicpower on the other hand made my amp seem dark and sluggish. You probably have stock cords or something similar around...if you have not already tried alternative powercords.
Cheers,
Soren
Cheers,
Soren