I doubt it. They have so many of the CKM55s left over I bet they have large stocks of those. By the way these CKM500 sound nothing like those by the way. I hope taking filter out of those ended up getting you better highs on them. That is the one area that was a big head scratcher for me..ATs house sound is all about the detailed extended highs which are almost completely missing on those CKM55s.
Look forward to see what you have to say Jarrett..Mine are sounding better and better every day I burn them. I am considering selling off my older CKM earphones and such to get me a pair of CKM1000 to try..Hate spending so much money on earphones though.