Abstract: An improved flexible sound absorbing banner includes a large rectangular flexible sound absorbing material capable of providing for sound absorption in a desired frequency range and structural integrity sufficient to support tension required without damage while permitting application of suitable graphics for desired visual effect. Opposed edges of the banner are clamped between pairs of elongated U-shaped cross-section spreader bars. A smaller dimensioned U-shaped spreader bar is received within a larger dimensioned U-shaped spreader bar and the two spreader bars are clamped together with the edge of the banner clamped between them. First bracket halves are clamped to the spreader bars and second bracket halves are mounted in spaced locations on a wall or ceiling. The first and second bracket halves are interconnected to mount the banner on the wall or ceiling.

Abstract: A suspended flexible sound absorbing banner includes a large rectangular flexible sound absorbing material, preferably made of fiberglass or other low density porous sound absorptive material, and covered with a porous, perforated or non-perforated, impermeable membrane such as NYLON sailcloth or commercial plastic membranes capable of providing for sound absorption in a desired frequency range and structural integrity sufficient to support tension required without damage while permitting application of suitable graphics for desired visual effect. Opposed edges of the banner are clamped between pairs of elongated U-shaped cross-section spreader bars. Each opposed edge is clamped by bending the edge of the banner through four 90° turns. A smaller dimensioned U-shaped spreader bar is receivable within a larger dimensioned U-shaped spreader bar and the two spreader bars may be clamped together with the edge of the banner clamped between them.

Abstract: This invention relates to a method and apparatus for simultaneously changing the beam angle of all of the lamps in an array of lamps between a spot beam and a flood beam by simultaneously moving all of the lamps in the array forwardly and rearwardly relative to a carved portion of their respective reflectors.