The SessionsTM MH510 is the result of a decade long collaboration of experience and professional audio expertise. Conceptualized and designed for the accomplished performer. Quality construction stands up to the most demanding performer Sound Pressure Level capability rivaling a concert experience. World class isolation ensures a private listening experience virtually eliminating bleed into the playback environment. * Detachable Coiled Cord Detachable Straight Cord Two sets of earpads to satisfy your changing demands * The HA4 is a compact stereo headphone amplifier featuring four discrete channels with individual volume controls. Exceptional signal-to-noise ratio ensures optimum clarity and offers a transparent reproduction of your session. The HA4 is an essential tool for enhanced listening performance and a vital accessory for the recording musician. * Extended headroom with +16dBu inputs. Four separate output volume controls.