​​​​Original stereo vintage ad for ACOUSTIC RESEARCH INC.  AR-3a speaker system has even less distortion, more uniform dispersion of sound and still greater power handling capability.  The improvement can be heard readily by most listeners.
Main office was located at 24 Thorndike St., Cambridge, MA.
This unique old one page 1968 high fidelity component trade magazine advertisement would display beautifully matted and framed.  It would make a nice accompaniment to your vintage stereo.