The TOA Electronics A-903MK2 30W 8-Channel Modular Mixer/Amplifier is widely recognized as the industry standard in installed sound system amplification. High Performance Engineered for high performance with wide frequency response, very low noise and distortion and excellent output regulation. Modular Design Eight module slots allow you to easily configure custom configurations choosing from over fifty TOA plug-in modules with an extensive array of features and connector types. You can increase the input capacity by connecting a second mixer or mixer/amplifier to the rear-panel Bridge In/Out jack. Versatile Outputs include transformer isolated 25 V, 70 V and 4 ohm plus a direct low-impedance mode if non-transformer operation is required. Multiple paging priorities are easily configured using optional mute-type modules activated by external switch-closure or mute-send modules. Pre-Out/Power-In jacks allow connection of external signal processing between the mixer and amplifier sections. Other features include protection circuitry, auxiliary output, bass/treble controls and remote master volume terminals.