Perfect for amusement park trams and trailers to keep the speaker impedance stable when adding or removing trailers.   It offers both RCA and speaker level inputs and has a proven track record with our PA 64.  It will comfortably handle 4 speakers per trailer and is only 4″ x 2.5″ x 1.5″, the price is right too.  Check out the “PA 64 Tram with 2 or More Trailers” diagram at our “Tech Info” tab.