@Dsnuts, I am using these with my custom silicone tips from Aurisonics....they really give something extra to the CKM500. Also, this morning I have reversed them, L to R over ear, and I am using my crossover cable from my RE272 so the sound is still L & R in each ear. The bass is a little tighter, and I am getting better instrament separation, more 3Dimensional sound, with the different angle into my ear canals. When I purchased my two pair of ESW9's and upgraded cables on them, I sold off my W4R's and ASG-1's because the ESW9's sound fit my sound preferences better. In the last few days, after listening the the CKM500's, I have sold both pairs of ESW9's because the CKM500 does everything better than the ESW9's. Mids and highs are better on the CKM500, and the soundstage is much better than the ESW9, the CKM500 is more balanced and the mids are the as good or better than the ESW9, IMO. In fact, I have a pair of modded ATH-W1000X, with DHC Symbiote upgraded cable, Lambskin Earpads, and AD2000 53mm drivers, that have a huge soundstage, that compare favorably in all aspects to the CKM500.......the CKM500 is like an in ear version of my modded W1000X, although my W1000X does it in a bigger better way. A/B ing both you can surely tell they are both Audio Technica products though....they have the signature Audio Technica aound that I feel is fantastic and fun, focusing on outstanding vocals and clarity!