Ocharaku Flat4 AKA TypeII
I had these and rarely used them. In excellent condition and comes with the right angle pigtail along with a set of comply tips.
PP & shipping is inclusive to the asking price.
Please find more information below:
Features

The length of acoustic canal individually differs. According to our research result of trial audition and questionnaire for more than 100 to 150 people attended at the event of the headphone festival, many people have longer acoustic canal than we had assumed.
Better sound quality can be obtained if the length of acoustic canal of the user and that of the phase correction tube are adjusted. Therefore, we developed a model with longer phase correction tube.
Type II coating, which has higher vibration-proof coating for phase correction tube enables playback of excessively fine reverberation of sound. Flat4 (KURO Type II) is for a standard acoustic canal length, and Flat4 (AKA Type II) for longer acoustic canal. We are proud of these two products.
L-shape connection code, which is useful to connect small DAP, is also attached.

If the acoustic canal is closed by wearing a canal-type headphone, resonance is occurred depending on the acoustic canal length and the acoustic pressure is elevated. Accordingly, intense peak will be generated.
The phase correction tube has the mechanism to eliminate the relevant peak.
In Flat4-AKA and Flat4-KURO, the effective length of the phase correction tune is 28 mm.
The effective length of the phase correction tube of the Flat4 (AKA Type II) is 30 mm.
In Flat4 (KURO Type II), the effective length of the relevant tube is 28 mm the same as conventional two types. The closer your acoustic canal length and the phase correction tube length, the better sound. Use one of which you can hear the best!

Deep low-tone sound & open-air sound propagationexceeding closed-type
High-resolution playback even fine reverberation of sound
Twin-Equalize-Element system Patented No.4953490 (JPN)
US Pat. No.8660288
Euro Pat. No.2595408
China Patent No.2067980
In our patent technology, masking in high-tone range due to acoustic canal closed resonance is avoided, and the reference point of sound was clearly defined first in the world by horizontally opposed alignment of elements.

Technical Data

Element Φ10 mm dynamic x 2 (per single channel)
Sound method Twin equalized element
Output sound pressure level 104 dBSPL/mW
Frequency characteristics 3.5 to 45 kHz(HiRes-ready)
Max. input 400 mW
Impedance 18 Ω
Mass About 18g
Plug Φ3.5 mm gold plating stereo mini-plug
Code length 1.2m (type Y)
Attachment Comply-foam ear tips T-200 size L (Size M is attached to the main unit.)L-shape connection code,storage can, cloth, Instruction Manual & Guarantee
Other Features

Flat4 configuration and comply-form ear tips reduce touch noises.
Tangential-less diaphragm realizes clear middle and high frequency sound with less distortion.
Strong neodymium magnets of max. energy integral 400 kJ/m3(50MGOe) configures rigid magnetic circuits together with electromagnetic pure iron employed for plates and yoke.
No prints are used on the display area. The display cannot be erased by laser marking.
Specific CCAW lines are employed for voice coils to realize high anti-resist input of 400mW.
Liquid crystal polymer is used for the cabinet to realize clear sound and echo.
L-shape connection code, which is useful to connect small DAP, is also attached.
MADE IN JAPAN