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For sale - a pair of tweeters belonging to acoustic research AR11 speakers. One tweeter read 3.6ohms and the other 3.4ohms (across the terminals). Bought them as spare for my AR11 speakers which have now been sold.Will suit most AR speakers rated at 4ohms, i.e. AR11 AR3/3a etc.Buyer to cover cost...
At A$300, this Acoustic Research AR-11 listing is a bargain compared to the obvious alternative of buying modern budget stands at this price, and it’s far below the typical used market for this model. Recent classifieds show excellent-condition AR-11s selling for AUD $1,550, putting this ask well under the 25th percentile and making it a strong deal for a fellow enthusiast.
The AR-11 is well-regarded for its robust 30.5 cm woofer and refined three-way design that mirrors the acclaimed AR-10 Π, delivering deep bass and clear mid-highs with dome drivers. At this price, even with unknown condition, the upside is substantial: you’re getting a rare, vintage 1977 speaker with genuine hi-fi pedigree that’s hard to find under AUD $1,000. If the cabinets are intact and the drivers functional, this is a clear buying opportunity worth pursuing quickly.
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.
See all Acoustic Research listings on RADAR.
