It has been 2 years after the thread started. So many good review about this pairs, but in reality the quality is not impressed me. I'm agree that the detail and high is better.
But about the bass, I really don't recommend to get this one. I have several IEM which has better bass such as Philips SHE9550, SHE8005 and Pioneer SE-CL711,
They lose in clarity and detail but not the bass, besides they costs only one-third and one-half compared to this pairs.
I would describe that CKS77's bass is average, it emphasizes on mid bass and upper bass but lack of sub bass. You won't expect car subwoofer quality with this pair.
Some IEM which is advertised as bass heavy like JVC xtreme xplosives HAFX1X,
Pioneer SE-CL751 with Subwoofer effect, are about the same.
I have concluded that no existing IEM which can match the Over-ear headphone
in term of bass quality. I'd rather dissapointed anyway but that's they are.
My comparison is against Over-ear headphone Plantronics backbeat pro and Philips Fidelio. My track is the "bass I love you" by bassotronics.
Until now I can not find IEM which has equal bass quality with those pairs.