2 to 4 Matrix Speaker Switch & Volume - 

This Matrix Speaker Switch + Volume unit for stereo amplifiers has 2 inputs and 4 outputs. Any of the inputs may be routed to any of the outputs, or the same input may be routed to all outputs or any combination. Simply connect the output of the amplifiers to the inputs, these inputs can then be routed to four different stereo speaker sets in four different locations, each speaker set can be individually activated via the push buttons on the front of the unit and individual volume controls.