In your case, I feel switching out the DH Labs for something like Acoustic Zen will make a significant improvement. I used Silversonic T14 for some time and felt it was quite lean and revealed the nasties present in my various systems. The AZ line of cables are extended and smooth. Even the Silver Ref II is a smooth sounding cable. You might give the AZ WOW a try.
I own a few different NAD pieces, the 502 being among them, and I feel they tend towards being musical, not bright. I've never heard or owned any Myryad gear, but it could be they are more revealing than the NAD components they replaced and combined with the DH Labs cabling could be the cause of the increased brightness.
I own a few different NAD pieces, the 502 being among them, and I feel they tend towards being musical, not bright. I've never heard or owned any Myryad gear, but it could be they are more revealing than the NAD components they replaced and combined with the DH Labs cabling could be the cause of the increased brightness.