Acoustic Research AR-30B
A mid-size bookshelf with a 254mm woofer and an acoustic suspension design. The AR-30B is the quiet workhorse of the Teledyne era.
Overview
The AR-30B is not the speaker that made Acoustic Research famous. It's the one that kept the lights on. It's a mid-size bookshelf model built during the Teledyne era. One source brands it "Teledyne Acoustic Research," which points to production after the 1967 acquisition. It carried the company's acoustic suspension design into a package meant for ordinary living rooms rather than laboratory reference shelves. One source calls it a "Standing Speaker," another a "Mid-size bookshelf speaker." Both are fair. Sources disagree on dimensions, listing it at either "35,5x58x28 cm" or "29″ X 13.75 X 9″," but either way it sits somewhere between a large bookshelf and a small floorstander, depending on where you put it.
Here's what's inside. A 254mm woofer handles the bottom, crossed to a 25mm dome tweeter up top. Sensitivity is rated at 88dB, and power handling is listed at 100 watts. Those are unremarkable numbers on paper, but they describe a speaker that's easy to drive and hard to hurt - the kind of load a modest receiver can push without complaint. The acoustic suspension design, according to the available documentation, was paired with "refined driver components and contemporary cabinet styling for accurate music reproduction." That's the manufacturer's framing, not a reviewer's verdict.
The record leaves a lot out. There's no production year, no original price, no frequency response figure, no impedance spec, no crossover frequency. The AR-30B shows up in the historical record mostly through owner listings, repair kits, and a single forum post from someone who calls it their "trusty old AR 30B."
Key Features
254mm Woofer in an Acoustic Suspension Cabinet
The AR-30B's defining feature is its acoustic suspension design - the sealed-box principle Acoustic Research pioneered in the 1950s. A 254mm woofer in a sealed cabinet trades efficiency for bass control, using the trapped air as a spring rather than a tuned port. It's the same trade-off as every AR speaker before it: you give up sensitivity, you get back tightness. At 88dB, the AR-30B sits in the middle of the road. It's not a hard load, and not a free ride. Modest amplifiers will work, and amplifiers with headroom will do better.
25mm Dome Tweeter
High frequencies come from a 25mm dome tweeter, a configuration that was well-established by the time the AR-30B was built. Dome tweeters offer wider dispersion than cones, which helps in a bookshelf speaker that's likely to be placed off-axis. The fact sheet doesn't give a crossover frequency or tweeter material, so there's not much more to say. The tweeter is a dome, and it's the part most likely to fail. A forum post from an owner reports a tweeter going out on their AR-30B, which is the kind of failure that eventually catches up with any 40-year-old soft-dome design.
Wood Veneer Cabinet
The cabinet is finished in wood veneer. The fact sheet notes one listing describing "a few chlps and one loose terminal," which is about as honest a condition report as you'll find. Veneer ages, chips, and lifts at the edges, and a loose terminal is a five-minute fix with a soldering iron. The cones on the same listing "have a couple of marks," which is cosmetic and won't affect performance.
Collectibility & Value
The AR-30B is not a high-value collectible, and the fact sheet doesn't pretend otherwise. It does have a healthy aftermarket for parts. Foam surround repair kits are readily available from multiple suppliers. One kit includes "2X Surrounds, 20g Adhesive, Repair Guide," and another is listed at €8,21. The foam surrounds are the known failure point, and the market has responded. If you're buying a pair, assume the surrounds need replacing unless they've already been done.
A restored woofer listing describes one unit as "professionally restored working" but notes "the dust cap is dried up and has 3 hairline cracks" — a reminder that even a "restored" driver can have hidden issues. Tweeter failures are reported by at least one owner, and replacements aren't as easy to source as surrounds. A pair described as coming from an estate sale and having "been in storage for years" sold as "Pristine condition," which is the kind of provenance that matters more for a $200 speaker than a $2,000 one. HiFiShark showed 14 listings at the time of capture — enough to suggest the model moves, not enough to suggest it's sought after.
There's no current sale price data in the fact sheet, so any number would be a guess. The AR-30B trades on the AR name rather than its own reputation.
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