The tiny TOOLS SUM-4 provides four line level high Z inputs, which accept a balanced or unbalanced source; stereo and monaural balanced low Z outputs; individual front panel level controls; stereo mixing/link port for input expansion and removable screw terminal connectors. The SUM-4 is designed to afford superior headroom and high definition audio. The SUM-4 may be set on a desktop, mounted on a wall or up to four units mounted on the RA-1, Rack-Able mounting shelf.

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