The CK10 is pretty forward and hot, it has a spike at 10kHz, but it could be the linear FR all the way up to 10kHz.
I compared FI-BA-A1 and SS within a fairly short time frame, not direct though.
In order to fairly assess ER-4S versus FI-BA-SS, you'd need a few hours and an equalizer, but intuitively, the FI-BA-SS is clearly the Japan Victor, just in my view.
I'd like to think there's more pioneering to it than a nicely ventilated Yashima driver, with stainless steel windows, (like Shigzeo implied).
Edit: Talking about the ER-4S, FI-BA-SS, Sony EX1000 etc., Final Audio 'doesn't believe' in multi-driver setups. They're all for the single driver design, some kind of purist principle I think?
Perhaps it makes sense in the way the Sony XBA-3 and TF10 have issues, and the UM Miracle seems to re-render the recording.
I didn't feel any issues or re-rendering in the JH11, it just has excellent low-level detail retrieval and uplifting sound. In a purist way, I suppose the frequencies are overlapping somewhere, but for riveting performance I'd get te JH11 over the FI-BA-SS any day.
Edited by kiteki - 4/21/12 at 11:20pm