The JBL's CSA 2120Z audio amplifier provides a small and powerful amplification solution. To produce stable and efficient sound amplification, the machine uses a universal switch-mode power supply and Crown's DriveCore technology. The unit works with both 70 and 100 volt systems. It comes with two RJ45 connectors for use with the CSR-V in-wall volume controls from the firm. Mono sum RCA connections and Euroblock are used as inputs. Euroblock connectors are used to give outputs. Visual feedback is provided by illuminated knobs, and the amplifier can handle AC voltages ranging from 100 to 240 VAC, 50/60 Hz, thanks to the universal power supply. The amplifier also contributes to HARMAN's GreenEdge sustainability project.