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The magnetic flux density strengthened by an additional front magnet to achieve increased sensitivity about 4dB.The transient response has been also improved to deliver crisp sound quality. Double Precision Acoustic Register structure reduces unnecessary resonant to achieve a more accurate tone control. The membrane in the driver unit has adopted super multi-layer film that stacked hundreds of ultrathin polyester resin film. It is high rigidity compared to the general PET film, providing a more glittering sound quality. Ring less Diaphragm bonding increased effective area of the diaphragm by bonding it directly to the driver edge.More air motion for the rich sound. Newly designed Deep Mount earpiece. Its' unique shape provide tight fit to the ear canals providing a rich bass reproduction. Adjustable port enable ear chip to fit more appropriately to the ear canals which varies by individuals.