I have recently bought a Black Sand power cord..... a Silver Reference model with Wallgate ends.
I am very pleased. Great detail, Clarity and speed. Musical yet natural sounding. This cord works well on my Equitech 2Q, my Velodyne DD15 Sub, Accustic Arts Amp but this model of cord, although it sounded OK, I.M.O. didn't excel on my CD Player. I haven't tried it on my preamp.
It was thin and dry sounding for about 50 hours before it burnt in, opened up and bloomed.
GREAT SOUNDING CORD AT A REALISTIC PRICE. They do have a 30 day return policy with this cord.
Dave D.