@mvvRAZ - here's the English translation:
LIZER LAB in Gunma Prefecture has released an earpiece "JIJU" that reproduces "out-of-head localization" with earphone listening that sounds can be heard from the front by patent technology on EC sites such as Amazon.
Earpiece `` JIJU '' to reproduce out-of-head localization with earphones
There are three sizes, L / M / S. Each pair costs 4,280 yen (tax included). A full set that includes three pairs of three sizes is also available for 10,500 yen (tax included). Each comes with a special case.
Includes special case, 1 size 1 pair / 3 size 1 pair
The earphones with the squeezed side facing the ears and the swollen side facing the ears have a different structure than ordinary earpieces. Also, a very small hole is provided in the vicinity of the earphone attachment part, and a part of the sound is emitted and reflected at a portion of the ear called the “tragus”. This gives the earphone sound a sense of direction.
Wear it in the opposite way to a general earpiece
A stainless steel plug "phase plug" is placed in the center of the umbrella. Control sound reflection and phase
In addition, a stainless steel plug "phase plug" is installed in the center of the earpiece. Controls echo / delay / diffusion / vibration isolation / phase of sound.
These designs reproduce "out-of-head localization" in which sound is heard right in front of the eyes, as well as provide a sense of depth and a sense of presence as if listening to live performances in a concert hall or live venue. Is said to be. In addition, the effect of the phase plug suppresses resonance and resonance, reducing noise and listening fatigue.
By making full use of sound reflection and control by the phase plug, it gives direction and spatial expression to the sound of the earphone
The maximum diameter for each size is 13mm for L size / 12mm for M size / 10.5mm for S size. Compatible with earphones with stem diameter of Φ6.0mm or more.