Broadcast Tools' Tiny Tools products are great audio problem-solvers at affordable prices. All amplified products are powered by an internal bi-polar 15 V DC power supply, providing the exceptional headroom and high-definition audio Broadcast Tools products are known for. Each Tiny Tool is a compact 1/4-rackspace unit, allowing up to four to be mounted on the optional RA-1 rack shelf. Most products feature plug-in euroblock connectors.

The tiny TOOLS SUM-4 provides four line level high Z inputs, which accepts 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 rackmount shelf.