A surgical theater system includes a boom rotating about a hub and coupled to a counterbalance arm assembly having a counterbalance arm and a monitor mount assembly configured to permit a monitor or other device to be positioned horizontally and vertically within a surgical suite and maintain the vertical elevation selected. The counterbalance arm includes a proximal hub, a first parallel link, a second parallel link, a spring link, a spring and a distal hub. First, second and third proximal pivot axes extend through the proximal hub with the third pivot axis being movable along a radial line forming an angle with a line intersecting the first and second proximal pivot axes. The spring link is coupled to the third proximal pivot axis, spring and second parallel link.