The headphone was only an audio product to audit only by ear so far. However, I am thinking that the direction of which the sound
came is informed through person's skin by the harmonic component that was included in the starting up element of the sound
(It was thought that it is transmitted directly to the brain by way of the nerve not the audiphone), and I discovered that the color
of the sound becomes vivid, too. So we added to H2 this fact. As a result, a peculiar sound stage to the headphone
that extends to stick in surroundings of the head moves to front and it approaches the speaker audition.
The unnatural headphone audition to listen only by the ear notices a peculiar stress to the auditor given at the same time.
When external BP (super-tweeter) enters, it comes to be able to do audition with relaxing.