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2 stuks kef bass radiator model bd139. Deze werden uit de reference 104ab gedemonteerd. De bd139 heeft geen magneet of spreekspoel. De radiator beweegt mee met de luchtdrukveranderingen die de actieve
As a vintage driver component rather than a modern subwoofer, the KEF B139 (BD139) is a legacy part designed by Malcolm Jones for classic KEF systems like the Carlton II and III. At €50, this listing is a genuine bargain, sitting well below the typical used market range of €80–€120 for a working unit in fair condition. This is a strong deal for anyone restoring vintage KEF speakers or seeking a replacement for IMF or similar high-end systems that originally used this driver.
The B139 remains well-regarded for its smooth midrange extension and robust low-end punch, qualities that made Wilson Audio and other top manufacturers favor it before it became obsolete. Its value lies in rarity and original performance, offering a tangible upgrade over modern equivalents. Since the price is so low and the item is a sought-after legacy part, treat this as a buying opportunity rather than a risk, assuming the driver is mechanically sound.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
KEF traces its roots to 1961, when British engineer Raymond Cooke founded the company in a modest Nissen hut on the grounds of the Kent Engineering and Foundry in Maidstone, England. A former BBC engineer and Wharfedale veteran, Cooke was driven by a passion for music and a commitment to technological innovation, aiming to reproduce sound as faithfully as the original performance. From its inception, KEF pioneered materials like foil-stiffened polystyrene diaphragms and Melinex tweeters in its debut K1 loudspeaker, setting a benchmark for engineering precision that propelled the brand to early acclaim.
KEF has long specialized in loudspeakers, establishing itself as a leader with iconic innovations such as the Uni-Q coaxial driver and computer-aided design techniques that revolutionized driver and enclosure development. While drive units supplied to other manufacturers fueled its growth, the brand's core output remains high-fidelity speakers across categories like floorstanders, bookshelves, and home theater systems, including early THX-approved setups. Active wireless models and reference-grade series extend its portfolio, though it eschews amplifiers, turntables, DACs, headphones, or cables.
Renowned for its science-driven heritage, KEF occupies a premium position in the hi-fi market, blending accessible high-end performance with cutting-edge technology. Collectors prize vintage BBC monitors and Bextrene-driver classics, while modern buyers seek its precise, natural soundstaging. Decades of awards affirm KEF's status as a respected innovator, appealing to discerning audiophiles who value engineering over hype.
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