This UE700 is made before Logitech revised it to rev.2.
PRO: Well-extended low frequency decay. Reverberant characteristic is appropriate, resembling that of a RRF room condition until 6~7 ms.
CON: Slight channel mismatch in the lower frequency, inverted polarity. The high frequency peak can be bothersome to some users.
ON SECOND THOUGHT #3: This is the flattest TWFK-equipped IEM I've measured, on par with UE900 modified. I hope I could get a hold on to a pair, so that I can do some modification!
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