Extron XPA U 358C is an ENERGY STAR qualified audio power amplifier delivering eight 35 watt channels in a half rack, 1U, convection cooled, plenum rated enclosure that includes rack mount hardware. The XPA U 358C-70V simultaneously delivers 35 watts into four channels at 8 or 4 ohms and 35 watts into four channels at 70 volts while the XPA U 358C-100V simultaneously delivers 35 watts into four channels at 8 or 4 ohms and 35 watts into four channels at 100 volts . The XPA U 358C offers unprecedented channel density and 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.