Bought these used, in excellent shape, to use mainly for listening to FLAC files on my MacBook Pro using MPlayer X. Also ordering a Pono Player which I plan on running in balanced mode with these puppies. I noticed that Surf Cables makes balanced headphone lines for them, so I searched them out. Remarkably, I found a pair for 35 Canadian dollars. I have noticed after the first day that they seem to naturally carry a little more bass than my beloved HD 380s. Early indications are leading me to believe that the 545's soundstage is more spacious. I've...