The Extron XPA U 1004 is an ENERGY STAR qualified audio power amplifier delivering four 100 watt channels in a half rack, 1U, convection cooled, plenum rated enclosure that includes rack mount hardware. The XPA U 1004 delivers 100 watts into 8 or 4 ohms while the XPA U 1004-70V delivers 100 watts into 70 volt systems and the XPA U 1004-100V delivers 100 watts into 100 volt systems. Offering unprecedented channel density, the XPA U 1004 Series provides the ability to install units without using rack spaces for ventilation, conserving precious rack space. It features a highly efficient advanced Class D amplifier design with power factor correction, ultra low inrush current, defeatable auto?standby with fast wake up, and our patented CDRS – Class D Ripple Suppression.