seanwee
Headphoneus Supremus
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Read the release notes that said March 2016 release.
As for the high end question, I am pretty sure they will be polite and smooth as a monitor should being a pro tool. Can't have sibilance or ear fatigue with a bright or peaky high end in a monitor unless it is badly tuned which AT won't do. I don't think it will roll off really early but it won't extend like the E70 will and it will be pretty even and short of bright or really crisp. Probably most like the CKR9 LTD treble and not as much energy up top as a CKR9. They say powerful bass so they will likely be warm like many monitor earphone are esp. if used as a personal listening phone but plugged into stage equipment or enough amplification they will tighten up more and give more balance.
Odd the specs:
Japanese E40 site (https://www.audio-technica.co.jp/mi/show_model.php?modelId=2812):
Model Dynamic type driver φ12.5mm × 2 Play frequency band 20 ~ 20,000Hz Output sound pressure level 107dB / mW Impedance 12Ω Input terminal A2DC connector jack plug φ3.5mm gold-plated stereo mini plug (L-type) I mass (excluding code) About 10g
U.S E40 site:
Frequency Response 20 – 19,000 Hz Sensitivity 111 dB/mW Impedance 39 ohms Weight 9 g (0.3 oz), without cable Cable Detachable 1.6 m (5.2') with A2DC connectors Connector 3.5 mm (1/8") gold-plated stereo mini-plug, L-shaped Accessories Included Carrying case, silicone eartips (XS/S/M/L)
Thats what always happens actually..............
Japan releases are almost always higher quality.......... which is why i bought my CKR-9s in Japan .
This also explains the Price and SQ difference between Japan spec models and Aliexpress lower spec / factory seconds .
IEMs sold in Japan are higher spec most of the time as Japanese have higher standards i presume.