By a limitless feeling of opening and a rich sound, I open up new dimension. Sound with the thickness utilized the characteristic of the open air. It is an audio with a feeling of opening and the thickness by a design phi 53mm driver for exclusive use of AD900X. It is equipped with a large-diameter screwdriver of the new development that gave an exclusive design. While there is thickness, I revitalize a clear tone. I adopt large-diameter CCAW bobbin winding voice coil. I enable delicate and rich power of expression. I adopt a honeycomb punching case made by aluminum and balance lightweighting with strength. Honeycomb punching having high opening rate smoothens a flow of the air in the case and plays a beautiful lingering sound. I pursue a light wearing feeling by 3D wing support. The toe Tarui-ya fitting design who controlled a feeling of pressure. I improve a feeling of fitting by the high durability and unpleasant pat of the moderate flexible raising material. I adopt an unpleasant pad of the raising material that gave three-dimensional sewing. In performing hold of an ear three-dimensionally of the low level fall out, and prevents it, and realize a feeling of comfortable wearing. OFC conductor single soup stock cord of the highly elastic TPE sheath adoption that I manage it and am easy to do it, and is hard to affect it. [Model] opening air dynamic model [Driver] phi 53mm [Output sound pressure level] 100dB/mW [5 reproduction frequency band] 35,000Hz [Maximum input] 1,000mW [Impedance] 38 omega [Plug] phi 3.5mm gilding stereo mini [Cord] 3.0m (single soup stock) [Accessories]: phi 6.3mm gilding stereo conversion plug adapter