The RB-HD6 headphone distribution amplifier is a 1U rack-mount device that distributes stereo audio to up to 6 different headphones, or can be used as 6 independent headphone amplifiers, each with its own input and volume control. A typical application might be to provide common audio feeds for guests in a radio studio, with a separate feed, perhaps including talkback, for the presenter.nnThe main stereo input is via XLR-3 connectors on the rear panel, which are electronically balanced and can be wired unbalanced. A stereo/mono selection switch on the rear panel sums the left and right outputs to provide a mono feed to the headphones. The unit can receive an alternative audio signal via a jack socket for each output channel. Inserting the jack plug will divert the headphone output from the main audio signal to the audio present on the jack plug. The alternative audio inputs can also be individually configured as parallel outputs from the front sockets, by setting internal jumpers. The main volume control adjusts the overall level of the 6 outputs and does not affect the level of channels using the alternative inputs. The main volume can be disabled by internal jumpers.