The 6kHz spike issue of inner ear canal type ear phones
Inner ear canal type ear phones are deeply inserted in to ears, thus occluding the ear canal intensely.
Hearing with occluded ear can be unnatural and/or imbalance compare to our usual hearing in open environment.
One of the most unpleasant hearing effect and major issue of inner ear canal type ear phones are the "Spiking sound" around higher frequency range; specifically around 6kHz.
Conventional solution for this "Spiking sound" was to suppress the higher frequency range in whole; unfortunately though this method helps reducing "Spking sound", it also drops the desired sound all together.
Proprietary Sound Solution
We had designed a new system to suppressing specific range of sound without effecting other sound range.
Successfully keeping the original sound balance and yet suppressing precisely the "Spiking sound".
Furthermore, sound range which was masked by this "Spiking sound" became more audible, thus producing more spatially broad and natural sound.
SkIS (Six kilohertz Intercept System)
Pat No：5696249(JPN)Mounted models：RK01
SkIS is a 6kHz sound suppressing system which is carefully designed and achieved by the spatial volume behind diaphragm, the venthole on driver frame and spatial volume of driver cap.
The air behind diaphragm acks like a spring supporting diaphragm vibration.
SkIs system carefully suppresses air movement behind diaphragm which acks on 6kHz sound range only and not effecting on other sound ranges.
a.i.m (Absorbing Ideal Mechanism)
Pat No：6400157(JPN)Mounted models：CU1
a.i.m is an applied Helmholtz resonance system; like perforated board used in sound proof room; absolves specified sound frequency.
Unwanted specific sound range can be suppressed by mounting a.i.m system in front of driver.
s.n.a (Smart Nozzle Adjuster)
Pat No：6508687(JPN)Mounted models：RK01
An unprecedented sound adjustable system in the sound nozzle at the end of production assembly for a precise balancing of L/R for a precise sense of sound position.