The Aiphone DMA2120 is a 120W Digital Amplifier made by Paso. The Aiphone DMA2120 is used with the following Aiphone Systems: TD-H - Selective Call Intercom System MC Series - Marketing Com Paging System Features: 4 channel inputs, 2 zone outputs High performance - high reliability design Wide frequency response - very low distortion Independent input controls (bass and treble) Direct muting or unmuting AC accessory outlet 25V and 70V output impedance 24V DC, 250mA regulated power supply output UL 6500 listed (US and Canada)