The JBL® CSMA series of Mixer-Amplifiers are a professional tool designed and built for Installed sound applications. The CSMA 1120 provides 4 inputs and 1 output. The built-in mixer capability with independent level control for each input channel and amplification with a choice of low impedance, 70V or 100V outputs. The product includes a rack mounting kit for installations to a cabinet. The system can be easily expanded with additional JBL Commercial Series Amplifiers and Commercial Series Mixers. Provisions are included for a remote volume control using the JBL CSR-V control module(sold separately).