The 1550W per channel at 4Ω Quested AP1550-2 Channel Class A/B Amplifier is a 2RU 19" rackmountable amplifier designed for powering passive monitors in recording studios and film production facilities. The amplifier is rated for 1550W per channel at 4Ω and 775W per channel at 8Ω. For I/O, the amplifier features balanced 3-pin XLRs input connectors with advanced sidechain limiting, balanced 3-pin XLR link output connectors for routing the signal to additional amplifiers, and 4-pole Speakon outputs for connecting to studio monitors.