https://acousticresearchspeakers.net Mon, 17 Aug 2026 20:53:48 +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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See the pictures for more details. Estimated arrival time can be delay. And it depends on custom in your country also. International Buyers – Please Note. Thank you for your understanding.

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Included Accessories & Condition Details: As shown in photos. Tested by our professional technician. Bass reflex 2-way speaker. Impedance: 4? Frequency response: 50-20000 Hz Sensitivity: 92 dB. Dimensions (width x height x depth): 25.5 x 45 x 32 cm. Hi, my name is Danny Chou. I live in Tokyo, Japan. I can speak quite fluent English. I can source anything you want from Japan! Feel free to contact me anytime! To the customers from the USA. 1, Regarding the items under 2,500 USD, the. Is included in the total price of the item. 2, Regarding the items over 2,500 USD, you need to pay the. To the customers from Worldwide (outside of the USA). Most of my items are Japan Standard Spec. Such as the Voltage, most are. If it doesn’t fit in your country, I recommend you use a voltage converter. We cannot change an address after the order has already been placed. We provide valid Tracking Numbers for all orders.

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Acoustic Research AR-4x Vintage Acoustic Suspension Bookshelf Speakers Pair.

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Other than that the speakers are in nice shape and sound great. Everything you see in the pictures is included except for the plants in the background and if you have any questions or would like more pictures please let me know. If you have an offer please reach out and message me and I will see what I can do, thanks.

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Speakers have been tested and work. Cosmetically could use a nice sand and restrain. They would look brand new.

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This listing is for a SANSUI SP-M1 Speaker Pair. During testing, sound output was confirmed from the speakers. However, one tweeter produced no sound. As a pre-owned item, expect signs of use including dirt, discoloration, scratches, and scuffs. Please examine all photos carefully as they show the actual condition and take precedence over the description. All included accessories are shown in the images; any photographic stands are not part of the sale. I will respond to your inquiry within 24 hours. My working hours are from 10:00 to 20:00 Japan time. Once you have received your item please make feedback for me as this will let me know that you have received your item. In case of damage please be sure to take pictures of the following items and send them to me: Photograph of the entire item / Photograph of the damaged part / A photo of the condition of the cushioning material in the package / A photo of the condition of the cardboard box it arrived in Statement on Legal Compliance and Quality Assurance for the Sale of Used Goods At my store, all products are directly sourced from trusted consumers or authorized sellers. This ensures the provenance and quality of every item I offer. I strictly adhere to the following practices: Legal Compliance: The products I handle comply with the Lanham Act, Common Law infringement, Unfair Competition Prevention Laws, and equivalent laws in other countries. This is because I thoroughly verify the origin and rights of each product, and seek legal advice when necessary. Quality Assurance: I rigorously clean and disinfect all items before listing them for sale and conduct quality control checks. This guarantees that I provide safe, high-quality products to my customers. Transparency and Responsibility: If it’s brought to my attention that any of my listings may violate the aforementioned laws, I will promptly investigate and take the necessary actions. Moreover, I commit to promptly correcting any misinformation and maintaining transparency. If you encounter such issues, please contact me directly. I promise to address your concerns with courtesy and professionalism. Customer Engagement: I always respond to customer feedback and inquiries with courtesy and promptness. If you have any questions or concerns about my products, please feel free to reach out to me. If there is any item you are looking for, please feel free to contact me. Even if the item is not listed in my store, I will do my very best to find it for you.

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Scott was part of the group of audio design companies founded in and around Cambridge, Massachusetts in the 1950s and 60s that were pioneers in speaker design. Scott bookshelf speakers are built similar to the classic smaller Advent bookshelf speakers, and to acoustic research AR-2 speakers in that they use the same acoustic suspension design to get a healthy bass response out of a very solidly built small footprint cabinet, but these are actually even smaller and more compact. Only 14 x 10 x 6.25 inches. REAL SOLID WALNUT wood cabinet construction, not particle board, plywood, or a veneer. Speaker wire or phono jack can be used for input. One knurled nut is missing from a wiring post, but these are standardized size that is shared with many other brands. They have been hooked up to a stereo receiver for testing. The speakers have no odd rattles or noises, and have very good, clear sound quality. The surrounds are good and do not need replacement. The lows kick, and the treble is bright. These can be pushed and get loud with only minimal distortion. No attempt has been made to clean the grilles, but the fabric seems very durable, with metallic thread, and could respond well to cleaning if done with care.

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2 215 PS AR speakers.

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