Hey Bob, Besides power cords, (there's this local guy named Pete something...you might want to give a call, he's got some nice stuff) the Ap's are also very revealing of speaker cables which of course, must be bi-wired for best sound. I've tried several combinations including a pair of the original Symo cable which were considered THE match for them back in their heyday ( I still have then ). I ran them into the mid/tweeters and found them extremely detailed and open, ymmv. I have settled on Harmonic Technology pro 9 and pro 11 series which really flesh out the details nicely but also seem to add a nice richness which the ribbons may sometimes like; depending on your electronics. Overall, I'm glad things are moving along as you continue "buffing out the new diamonds". Stay in touch. G