The SM5.1 multi-channel VU metering system has six independent channels, each with its own VU meter, for monitoring levels of a 5.1 surround system. Thru jacks allow audio signal to pass through to a subsequent device. Although aimed at surround systems, the SM5.1 can be used anywhere that six channels of metering are required, or for monitoring three stereo signals. Each meter can be aligned with a front panel-trim control, and +4 and -10 operating levels are supported.