Preliminary identification
Photo reference
1 uploaded photo
Overview
This is a pair of vintage Infinity Studio Monitor (SM 152) floor-standing speakers featuring massive 15-inch woofers, dual midranges, and high-output tweeters. Known as 'party monsters' of the audio world, these American-made towers were designed for exceptionally high efficiency and powerful bass output.
Story
In 1968, aerospace engineers founded Infinity in a California garage using aerospace materials to push acoustic limits. By the late 80s, these giant SM 152 towers were engineered to deliver massive, room-shaking audio efficiency.
Maker / Origin
Infinity Systems was co-founded by Arnie Nudell, John Ulrick, and Cary Christie, who applied advanced aerospace techniques to loudspeaker design. They revolutionized the high-end audio market with innovations like planar magnetic drivers and polypropylene cones, becoming a hallmark of American hi-fi heritage before being acquired by Harman International.
Condition & Value
The cabinets show visible wear and surface scuffs around the edges, and the driver surrounds appear aged. Re-foaming the woofers or midranges is a common requirement for speakers of this age; degraded foam reduces value by 30-40% until restored.
Full Research
Sold comps, value drivers, and venue guidance pulled from recent auction results.
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Comparable demand stays strongest where maker, originality, and venue confidence line up. Broader examples still trade, but the range tightens quickly when provenance, condition, or selling lane fit is missing.
Best Venue
Specialty auction or a focused dealer with buyers already in this lane.
Signed example with light edge wear and original frame.
Comparable format with stronger provenance and cleaner surface.
Smaller related piece with visible craquelure and trimmed margins.
Period match with softer condition and weaker subject matter.
Close market lane comp with similar material and presentation.