The Ampex Stereo Center provides a convenient grouping, on a single panel, of all the controls necessary to maximum stereo listening enjoyment from any source. Whether the stereo source selected is from magnetic tape, stereo phono, or the Stereo Center's own integral Stereo radio tuner, the control functions which are provided automatically assure the proper matching, equalization, and balance of the input signals. As shown in the functional diagram, the desired signal source is determined by pushbutton selection. If a monophonic (single channel) signal is selected, the Stereo-Single button is depressed so that each of the amplifier/speaker systems receives an identical input, and the resulting reproduced sound appears to come from a point midway between the two speakers.