The ATH-CKS99's Solid Bass technology utilizes an exclusive Double Air Chamber System. In addition to the main air chamber that houses the driver, the earpieces have an additional chamber that operates in conjunction with a specially shaped housing to control and focus the air flow produced by the driver movement and expand its bass output. 

In addition, the ear tips of the ATH-CKS99 are designed for maximum bass response, with a movable two-position post that lets wearers adjust the ear tips for the best fit, sound isolation and low-frequency performance.

• Newly developed Double Air Chamber System expands bass output for powerful bass without sacrificing audio clarity
• Exclusively designed 13 mm drivers create an entirely new rich audio experience
• 2 position post maximizes sound isolation while providing a better fit
• 3.9-ft. (1.2 m)) elastomer cord with L-shape plug
• Carrying pouch & XS/S/M/L ear tips included