Hi Carl-- glad to see your Sidewinder report. Your observations agree with some of the characteristics that I found in the prototype I had, ie weak bass, somewhat bright (but I thought it could be my new Ded. AC), and wide but shallow soundstage. However, I also found mine to be very smooth, detailed, quick, and have (at the time) what I thought to be a good mid-range. Thanks, Craig.
MY Sidewinder AC cord progress:
This is a demo from the Cable Company. They burned it in for 250 hours, and sent it to me. I plugged my Krell amp into it, and directly into the wall outlet. After a 24 hour settling time, I listened. Very bright, dynamically laid back, zero bass in the bottom two octaves, wide and shallow soundstage (that's a function of the brightness, IMHO). So far, not the best AC cord I've tried with my amp. MORE LATER....