The JBL® Commercial Series of Amplifiers are a professional tool designed and built for Installed sound applications. There are both single channel and two channel models. They provide 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 products. Provisions are included for a remote volume control using the JBL CSR-V control module.