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Ocharaku Sound Flat4-AKA TypeII

Out Of Stock Ocharaku Sound Flat4-AKA TypeII - Flat4-AKA TypeII

Ocharaku Sound Flat4-AKA TypeII HiFi In-ear Earphones


  • 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 cable, 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-Sui and Flat4-Xuan, 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 propagation exceeding 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.


  • 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
  • Cable length:1.2m (type Y)


  • Ocharaku Sound Flat4-AKA TypeII
  • Comply-foam ear tips T-200 size L (Size M is attached to the main unit.)
  • storage can

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Due to the impact of the COVID-19 pandemic, global international shipping will delays. The delay at our Hong Kong post office is very serious, so we have changed to other fastest or most efficient international shipping. Now the normal estimated delivery time may be delayed by about 1-2 weeks. In some countries where is higher free-tax rate, we will provide free courier service as much as possible.

Free Shipping

All listed items will be shipped though Registered Airmail with tracking number if there is no extra shipping method option listed or shipping description in the product page.

Economy shipping: Will be shipped without tracking number.

Registered Airmail : Will be shipped via such as Hong Kong post , Deutsche Post , Netherlands Post , Singapore Post, you can leave us a message if you have any requirement about the shipping method .

It will be shipped via Hong Kong Post by default, Europe countries can choose to be shipped via Deutsche Post or Netherlands Post, it is also FREE, pls leave us a message if needed.

Express service: Will be shipped via DHL/EMS/UPS/FedEx

  • Views: 6949
  • Brand: Ocharaku Sound
  • Product Code: Flat4-AKA TypeII
  • Availability: Out Of Stock
  • $399.00

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