JM..2 is correct. Transparent would be my choice.
AC Power Cord and Krell Pre
I have a Krell Evo 202 preamp. The manual says to use the power cord supplied with the preamp. I can understand that instruction both for liability purposes and for assuring a satisfactory connection. But would a high quality aftermarket power cord actually improve the sound? If you think so, which cord or cords?

