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The Acoustic Research AR 303 is a 3-way acoustic suspension loudspeaker released in 1995 as a modern re-engineering of the legendary AR-3a. It is known for its exceptional bass extension, reaching down to 32Hz without the need for a subwoofer. This set is in Very Good shape, with the only a few nicks (see pix) keeping them from being Excellent, these speakers still sound fantastic, 30+ years on. While not a 'flaw' it is worth pointing out that the shade of these speakers is slightly different, one is a shade or two darker than the other; from the front, with the grilles on, it's undetectable, a side view reveals that a bit more.This set of 303s is Ken Kantor's re-engineering of the 3a. Similarly sized and similarly heavy but more expensive, it uses what superficially appear to be the same drive-units: the hefty, long-throw, 12" woofer, the ¾" cloth-dome tweeter, and the 1.5" dome midrange driver with its distinctive metal-mesh protective cover. Rather than the 3a's rather haphazard placement, however, the 303 mounts these drivers in a vertical array, with the tweeter and midrange offset to one side of the baffle. The speakers are supplied as a mirror-imaged pair.We have the original AR boxes for these and will double-box them, very well packaged for shipping ($200) if you choose to have them shipped; you can also visit them at our shop and take them home with you.Note: The speaker stands shown in these photos are not for sale, merely for demonstration.Enclosure Type: 2-way bass reflex (vented enclosure).Drive Units:12" paper-cone woofer1.5" soft-dome midrange0.75" soft-dome tweeterCrossover: 650Hz and 5.5kHzImpedance: Nominal 6.5ΩPower Handling: 50-250WDimensions: 25" H x 15" W x 11" DWeight: 54 pounds eachService History: No service records were included from the prior owner. Here at the shop we did routine testing, cleaning and inspection.Cosmetic Condition: Overall we rated this at Very Good.In the Milwaukee Area? Stop in our shop to inspect/demo
Because this is an older classic rather than a modern replacement-era design, the main question is condition and originality—not market timing. At US$900, it sits above the recent US$836 75th percentile for comparable used listings, so this is ambitious rather than a fair-market buy; I’d only bite quickly if the cabinets, drivers, and crossover work have been very well documented.
That said, the AR-3a is well regarded for its big, natural midrange and easy long-term listenability, and clean examples still have real appeal to vintage hi-fi buyers. If this pair is truly excellent, with original drivers intact and no recapping surprises, the upside is owning a respected classic in unusually good shape; just don’t pay a premium unless the seller can prove that the hard parts of a 50-year-old speaker have already been addressed.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Acoustic Research (AR) emerged from Cambridge, Massachusetts, in 1954, founded by audio pioneer Edgar Villchur and his student Henry Kloss. Villchur, an inventor, researcher, and educator, developed the groundbreaking acoustic suspension loudspeaker principle, patented in 1956, which enabled compact speakers with deep, distortion-free bass. Their debut AR-1 model, unveiled at the 1954 New York Audio Show for $185, revolutionized the industry by shrinking enclosure sizes by up to 75 percent while delivering superior performance, setting the stage for AR's rapid ascent.
The brand focused primarily on loudspeakers, pioneering acoustic suspension designs like the AR-1, AR-2, AR-3 series, and compact bookshelf models such as the AR-4, which appealed to students and families. AR expanded into turntables, including the enduring AR Turntable still prized by vinyl enthusiasts, alongside other stereo components. This emphasis on innovative speakers with flat response, wide dispersion, and extended bass defined their catalog, prioritizing engineering over aesthetics.
AR commanded peak dominance in 1966 with over 32 percent of the U.S. loudspeaker market—the largest share any hi-fi company has achieved—earning reverence for natural sound reproduction and robust build quality. Now owned by VOXX and shifted toward lower-end accessories, its vintage products remain collector icons, embodying mid-century high-fidelity excellence for discerning buyers seeking timeless accuracy.
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