There is considerable interest in the Acoustic Research ("AR") AR-3. Following is a very brief description of the AR-3 and its place in history. Special note: while the 1967 AR-3a was an improvement of the AR-3 in some respects, the changes were subtle. Restoration of the AR-3a, however, is much easier than with the AR-3. After the introduction of the first acoustic-suspension commercial loudspeaker system (AR patent No. 2,775,309), the 1954 AR-1, AR went on to develop a scaled-down, lower-cost version of that speaker with the introduction of the AR-2 in 1957. For quite some time Edgar Villchur (patent-holder and co-founder of AR) had experimented with the hemispherical "dome" direct-radiator tweeters, and in 1958 AR once again pioneered in loudspeaker technology with the introduction of the landmark model AR-3, which used the AR-1’s acoustic-suspension woofer in conjunction with the first commercially available hemispherical (“dome”) high-frequency tweeters available in a loudspeaker. There is considerable speculation across the globe about who introduced the "first" dome tweeter, but most experts -- and historical documents -- support the notion that the AR-3's 2-inch and 1-3/8-inch phenolic-dome tweeters were the first direct-radiator dome tweeters commercial manufactured. These dome tweeters reproduced music very accurately, and the on- and off-axis performance of these speakers -- even by today's standards -- is still considered remarkable. Dome diaphrams had been previously used all the way back to the early 20th century, but these diaphrams were always useds with horn-type and compression drivers, never as direct-radiator, wide-dispersion dome tweeters. For nearly ten years after its introduction, the AR-3 was widely regarded as the most accurate loudspeaker available at any cost, and was used in countless professional installations, recording studios and concert halls. Many well-known professional musicians used AR-3 loudspeakers due to their life-like, accurate sound reproduction. In the early 1960s, AR conducted a series of over seventy-five live-vs.-recorded concerts across the country in which the sound of a live string quartet (The Fine Arts Quartet) was alternated with the echo-free recorded music played through a pair of AR-3s, using Dynaco MkIII amplifiers, Dynaco PAS-3 preamp and recorded anechoically on an AMPEX Model 351 stereo-tape recorder and condenser microphones. In this “ultimate” subjective test of audio quality, the listeners in these concerts were largely unable to detect the switchovers from live to recorded, a strong testament to the AR-3's extraordinary accuracy and audio quality. It is generally felt that this famous series of live-vs.-recorded concerts validated the Acoustic Research AR-3's sonic accuracy (the "ultimate" subjective test) On September 13, 1993, an AR-3 was placed on permanent display in the Information Age Exhibit, The National Museum of American History, The Smithsonian Institution in Washington, DC. The AR-3 was a part of a stereo pair donated to the Smithsonian by the writer, Tom Tyson. The attached image is a photo taken in the Smithsonian during the presentation of the AR-3 at the museum in late 1993.