A7 Voice of the Theatre speaker-system

The Altec Lansing A7 is a combination horn/bass-reflex 2-way speaker system. A compression horn provides mid/high-frequencies above 500 or 800hz, depending on the x-over/h-f units of the particular model. (The current system’s x-over is quoted at 900hz). High-frequency drivers were the equivalent of Altec’s less-costly units, such as the 802 or 806 (there were several variations, and designations) and the h-f horns were generally the less-costly ‘sectorals’, such as the 811 for the A7-800, crossed-over at 800hz, and the 511 for the A7-500, crossed-over at 500hz. Below this range, a 15″ driver coupled to a front-loaded horn/bass-reflex combination-enclosure supplies lower-midrange, and lively bass.