Bring the bass feel every beat with the mdr zx660ap on ear headphones thanks to 40mm drivers that deliver thumping bass and deep rhythms beat response control tightens up the bass for a low end without distortion even at high volumes while the smooth headband and cushioned earpads mean you can listen in style and comfort dynamic sound vivid bass experience clear balanced full frequency audio with a powerful low range thanks to our combination of sound technologies beat response contro