Commercial 4-Channel 70V Power AmplifierProfessional 4 Channel 70V Power Amplifier Compact size only 2 RU and 14" deep for reduced rack cost and floor space Bridgeable channels 1 + 2 and 3 + 4, for maximum flexibility Active inrush limiting eliminates AC inrush current, removing the need for expensive power sequencers HD15 DataPort connector for Q SYS networked control and monitoring Custom integrated security cover for tamper proof installations Variable speed fan for low noise 1 dB