https://acousticresearchspeakers.net Fri, 11 Sep 2026 10:10:21 +0000 en-CA hourly 1 https://wordpress.org/?v=4.1.1 https://acousticresearchspeakers.net/2026/08/rare-vintage-acoustic-research-ar-4x-bookshelf-speakers-blond-birch-tested/ https://acousticresearchspeakers.net/2026/08/rare-vintage-acoustic-research-ar-4x-bookshelf-speakers-blond-birch-tested/#comments Sun, 16 Aug 2026 08:50:04 +0000 https://acousticresearchspeakers.net/2026/08/rare-vintage-acoustic-research-ar-4x-bookshelf-speakers-blond-birch-tested/ read more »]]>















AR-4x Condition Block (Blond Birch / FX72617 & 18). Overall Condition: Excellent vintage condition with fully functional drivers and preserved acoustic-suspension integrity. Cabinets retain its original birch veneer (blond finish) with clear lacquer intact and no refinishing. Veneer shows only light, age-appropriate wear consistent with late-1960s AR production. A tiny chip on one corner and what appears to be a chip repair on other corner of FX72618 as seen in photos provided. Drivers: Original 8″ cloth-surround woofer and 2.5″ cone tweeter present and operating correctly. Woofer suspension remains compliant, with no hardening or air leaks. Tweeter produces clean high-frequency output across all program material. Controls: Tweeter level control rotates smoothly and responds properly. No dead spots or intermittent dropouts. Crossover & Internal Components: Original crossover network intact. No evidence of non-factory modifications, replacement drivers, or modern parts. Cabinet: Factory birch veneer with authentic blond finish. Edges, corners, and seams remain tight. Grill frame solid and square. Grill Cloth: Original AR linen-style cloth with uniform color and no tears. After Market size appropriate badges included. Testing: Speakers have been load-tested at moderate listening levels. No distortion, rattles, or cabinet resonance. Acoustic seal remains tight, confirming proper AR-4x low-frequency performance. This unit retains its factory birch veneer, original drivers, acoustic-seal warning label, and correct late-run AR typography. A clean, authentic example of one of AR’s most respected acoustic-suspension designs. ? Cabinet & Finish. Factory birch veneer (blond finish). Clear lacquer intact; no refinishing. Late-1960s birch grain pattern consistent with FX-series production. Light birch cabinets were lower-production and are more desirable today. ? Drivers & Components. 8 acoustic-suspension woofer with cloth surround. 2.5 wide-dispersion cone tweeter. Original crossover at 1.2 kHz. Tweeter level control present and functional. All components appear original and period-correct. Woofers play cleanly with strong low-end response. Tweeter functions properly across level settings. No distortion, rattles, or intermittent dropouts. Cabinet is airtight, maintaining proper acoustic-suspension behavior. The label typography, acoustic-seal warning block, and birch finish all match late-run AR manufacturing. This is an authentic, original-finish cabinet with no refinishing or modern veneer work. System type: 2-way acoustic suspension. Frequency response: 45 Hz – 20 kHz. Recommended power: 15W minimum. Dimensions: 10 × 19 × 9 in. Weight: 18.5 lb.

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Up for sale is a rare pair of early 1970s Rectilinear Mini-III bookshelf speakers. Designed during the golden era of high-fidelity audio, these compact powerhouses are famous for outperforming speakers twice their size. Rectilinear Research Corporation was known for its no-compromise engineering, and the Mini-III is a prime example. They feature a robust 3-way design that delivers incredibly warm bass, clear mid-range, and crisp highs. If you love the vintage acoustic suspension sound (like classic AR, KLH, or Advent), you will love these. Perfect for a vintage vinyl setup, office, or living room stereo system. Design: 3-way acoustic suspension bookshelf loudspeaker. Drivers: Heavy-duty woofer, dedicated midrange, and crisp tweeter. Cabinet: Rich natural wood veneer cabinets. Impedance: 4 ohms (pairs beautifully with vintage receivers). Era: Early 1970s (Made in Brooklyn NY). One connector replaced with a screw down. Cosmetic: Cabinets are in good vintage shape with some wear from age (see photos). Grilles are intact with original badges present. Professional, heavy-duty packing to ensure safe arrival.

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Rare Acoustic Research AR-XP410P 3 Way/4 Driver Powered Speakers w 10 Subs! There is some cosmetic damage in the way of scratches and knicks. Type: 3 way, 4 driver loudspeaker system. Frequency Response: 25Hz to 50kHz. Recommended Amplifier: 15 to 150W. Bass: 1 x 10 polypropylene. Midrange: 2 x 4 aluminium. Tweeter: 1 x 1 extended frequency. Finish: black ash vinyl with high gloss black accents. Note: 175 watt RMS powered sub amplifier.

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The Acoustic Research AR90 is one of the most celebrated floorstanding speakers ever produced. Designed in the late 1970s under Teledyne’s stewardship of the AR brand, the AR90 was AR’s flagship 4-way loudspeaker system and represented the pinnacle of their acoustic suspension engineering. Featuring a 12″ woofer, a 6″ lower midrange, a 2″ upper midrange dome, and a 3/4″ tweeter, the AR90 delivers a remarkably coherent and musical soundstage that few vintage speakers can match. Its wide frequency response, tight bass reproduction, and smooth highs made it a reference-class speaker in its day and it remains highly sought after by audiophiles who know what they’re listening to. These are working, fully functional AR90s that have been actively enjoyed in a real hi-fi system. I’ve been running them with a NAD preamp/amp stack and they sound absolutely phenomenal: detailed mids, tight and extended bass, and smooth highs with zero distortion or rattling. That said, I want to be fully transparent. The foam surrounds on the woofers have some tears and small holes. This is extremely common on AR90s of this era as the original foam degrades over time. Despite the surround condition, both woofers are functioning and the bass response remains strong. Cabinets show age-appropriate cosmetic wear consistent with vintage speakers from this era. All drivers produce sound, tweeters and midranges are in great shape. What You’re Getting. This is a rare opportunity to own a pair of genuine AR90s, a speaker that competes with and often beats modern speakers costing several times more. Whether you want to recap the crossovers and reseal the surrounds for a full restoration or just plug them in and enjoy the music, these deliver.

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The Acoustic Research AR-5 Tower Speakers are a pair of right and left speakers with an integrated powered subwoofer. The sleek black speakers have an audiophile sound. Perfect for a 2.0 channel home audio system, these wired speakers from Acoustic Research offer a high-quality listening experience with a modern design. Ideal for TV, video, and music lovers looking to enhance their home audio setup. When I first got these speakers they needed a few things. I wound up upgrading the surrounds, recapped the amps and a few other things. I have been blessed to evaluate many different speakers over the years. These AR5s are exceptional. They seem to do everything right. The 300 watt subwoofer produces as much bass as one could possibly hope for. Everyone I have let listen to these have all been impressed. Smooth, detailed non-fatiguing sound. I had intended on keeping these but circumstances are so that I need to sell them.

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Rare Acoustical Power Labs Bookshelf Speakers 3 way sound very good. Kinda of odd ducks here,, hope someone wants them. Found this info on the net. The Lankraff TLO is a vintage speaker model from Acoustic Power Labs with the following specifications: a. Frequency response of 28Hz-40kHz\. Power input of 30 watts RMS. Peak power input 300W musical impedance of 4 ohms. The woofer is definitely a Infinity Woofer from the QA line. The flat spot on the dustcap is a dead giveaway. The cone tweeter-Midrange is also an Infinity. Out of the WTlc speaker. This is interesting, information. The company Acoustic Power Lab (APL) was founded by sound engineer Raimonds Skuruls and specializes in loudspeaker frequency characteristics correction technology and professional audio. Their work involves modern DSP hardware and software, not the production or use of vintage Infinity speaker drivers (such as the EMIT or EMIM drivers). Since 1983, Infinity has been part of Harman Internati.

]]> https://acousticresearchspeakers.net/2026/06/rare-acoustical-power-labs-bookshelf-speakers-3-way-sound-very-good/feed/ 0 https://acousticresearchspeakers.net/2026/05/rare-acoustic-research-ar90-legendary-vintage-hi-fi-speakers-fully-functional-9/ https://acousticresearchspeakers.net/2026/05/rare-acoustic-research-ar90-legendary-vintage-hi-fi-speakers-fully-functional-9/#comments Thu, 21 May 2026 03:44:04 +0000 https://acousticresearchspeakers.net/2026/05/rare-acoustic-research-ar90-legendary-vintage-hi-fi-speakers-fully-functional-9/ read more »]]>










The Acoustic Research AR90 is one of the most celebrated floorstanding speakers ever produced. Designed in the late 1970s under Teledyne’s stewardship of the AR brand, the AR90 was AR’s flagship 4-way loudspeaker system and represented the pinnacle of their acoustic suspension engineering. Featuring a 12″ woofer, a 6″ lower midrange, a 2″ upper midrange dome, and a 3/4″ tweeter, the AR90 delivers a remarkably coherent and musical soundstage that few vintage speakers can match. Its wide frequency response, tight bass reproduction, and smooth highs made it a reference-class speaker in its day and it remains highly sought after by audiophiles who know what they’re listening to. These are working, fully functional AR90s that have been actively enjoyed in a real hi-fi system. I’ve been running them with a NAD preamp/amp stack and they sound absolutely phenomenal: detailed mids, tight and extended bass, and smooth highs with zero distortion or rattling. That said, I want to be fully transparent. The foam surrounds on the woofers have some tears and small holes. This is extremely common on AR90s of this era as the original foam degrades over time. Despite the surround condition, both woofers are functioning and the bass response remains strong. Cabinets show age-appropriate cosmetic wear consistent with vintage speakers from this era. All drivers produce sound, tweeters and midranges are in great shape. What You’re Getting. This is a rare opportunity to own a pair of genuine AR90s, a speaker that competes with and often beats modern speakers costing several times more. Whether you want to recap the crossovers and reseal the surrounds for a full restoration or just plug them in and enjoy the music, these deliver.

]]> https://acousticresearchspeakers.net/2026/05/rare-acoustic-research-ar90-legendary-vintage-hi-fi-speakers-fully-functional-9/feed/ 0 https://acousticresearchspeakers.net/2026/05/rare-acoustic-research-ar17-bookshelf-speakers-2-0-channel-wired-black-pair/ https://acousticresearchspeakers.net/2026/05/rare-acoustic-research-ar17-bookshelf-speakers-2-0-channel-wired-black-pair/#comments Tue, 19 May 2026 15:39:09 +0000 https://acousticresearchspeakers.net/2026/05/rare-acoustic-research-ar17-bookshelf-speakers-2-0-channel-wired-black-pair/ read more »]]>









The RARE Acoustic Research AR17 Bookshelf Speakers are a high-quality pair of wired black speakers in a 2.0 channel system configuration. These rectangular-shaped speakers feature banana jack audio inputs and are made of wood, providing a sleek and elegant design for any home audio setup. The Acoustic Research brand ensures superior sound quality and performance, making these speakers a great addition to any home audio system. Very good preowned condition.

]]> https://acousticresearchspeakers.net/2026/05/rare-acoustic-research-ar17-bookshelf-speakers-2-0-channel-wired-black-pair/feed/ 0 https://acousticresearchspeakers.net/2026/05/rare-acoustic-research-ar90-legendary-vintage-hi-fi-speakers-fully-functional-8/ https://acousticresearchspeakers.net/2026/05/rare-acoustic-research-ar90-legendary-vintage-hi-fi-speakers-fully-functional-8/#comments Thu, 14 May 2026 03:20:45 +0000 https://acousticresearchspeakers.net/2026/05/rare-acoustic-research-ar90-legendary-vintage-hi-fi-speakers-fully-functional-8/ read more »]]>










The Acoustic Research AR90 is one of the most celebrated floorstanding speakers ever produced. Designed in the late 1970s under Teledyne’s stewardship of the AR brand, the AR90 was AR’s flagship 4-way loudspeaker system and represented the pinnacle of their acoustic suspension engineering. Featuring a 12″ woofer, a 6″ lower midrange, a 2″ upper midrange dome, and a 3/4″ tweeter, the AR90 delivers a remarkably coherent and musical soundstage that few vintage speakers can match. Its wide frequency response, tight bass reproduction, and smooth highs made it a reference-class speaker in its day and it remains highly sought after by audiophiles who know what they’re listening to. These are working, fully functional AR90s that have been actively enjoyed in a real hi-fi system. I’ve been running them with a NAD preamp/amp stack and they sound absolutely phenomenal: detailed mids, tight and extended bass, and smooth highs with zero distortion or rattling. That said, I want to be fully transparent. The foam surrounds on the woofers have some tears and small holes. This is extremely common on AR90s of this era as the original foam degrades over time. Despite the surround condition, both woofers are functioning and the bass response remains strong. Cabinets show age-appropriate cosmetic wear consistent with vintage speakers from this era. All drivers produce sound, tweeters and midranges are in great shape. What You’re Getting. This is a rare opportunity to own a pair of genuine AR90s, a speaker that competes with and often beats modern speakers costing several times more. Whether you want to recap the crossovers and reseal the surrounds for a full restoration or just plug them in and enjoy the music, these deliver.

]]> https://acousticresearchspeakers.net/2026/05/rare-acoustic-research-ar90-legendary-vintage-hi-fi-speakers-fully-functional-8/feed/ 0 https://acousticresearchspeakers.net/2026/05/rare-acoustic-research-ar90-legendary-vintage-hi-fi-speakers-fully-functional-7/ https://acousticresearchspeakers.net/2026/05/rare-acoustic-research-ar90-legendary-vintage-hi-fi-speakers-fully-functional-7/#comments Fri, 08 May 2026 02:32:44 +0000 https://acousticresearchspeakers.net/2026/05/rare-acoustic-research-ar90-legendary-vintage-hi-fi-speakers-fully-functional-7/ read more »]]>










The Acoustic Research AR90 is one of the most celebrated floorstanding speakers ever produced. Designed in the late 1970s under Teledyne’s stewardship of the AR brand, the AR90 was AR’s flagship 4-way loudspeaker system and represented the pinnacle of their acoustic suspension engineering. Featuring a 12″ woofer, a 6″ lower midrange, a 2″ upper midrange dome, and a 3/4″ tweeter, the AR90 delivers a remarkably coherent and musical soundstage that few vintage speakers can match. Its wide frequency response, tight bass reproduction, and smooth highs made it a reference-class speaker in its day and it remains highly sought after by audiophiles who know what they’re listening to. These are working, fully functional AR90s that have been actively enjoyed in a real hi-fi system. I’ve been running them with a NAD preamp/amp stack and they sound absolutely phenomenal: detailed mids, tight and extended bass, and smooth highs with zero distortion or rattling. That said, I want to be fully transparent. The foam surrounds on the woofers have some tears and small holes. This is extremely common on AR90s of this era as the original foam degrades over time. Despite the surround condition, both woofers are functioning and the bass response remains strong. Cabinets show age-appropriate cosmetic wear consistent with vintage speakers from this era. All drivers produce sound, tweeters and midranges are in great shape. What You’re Getting. This is a rare opportunity to own a pair of genuine AR90s, a speaker that competes with and often beats modern speakers costing several times more. Whether you want to recap the crossovers and reseal the surrounds for a full restoration or just plug them in and enjoy the music, these deliver.

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