Fostex 6301NE Powered Active Monitor (Single), Electronically Balanced 20W D-class power amplifier for higher output level and less power consumption with no heat sink Dedicated 4-inch full range driver for clear audio reproduction Aluminum die-cast enclosure with identical height and width to the current B-series Flat panel design to avoid inadvertent power-off or level change; auto stand-by mode Electronically Balanced Monitor