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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
Condition is unknown, so at €45 this reads as a strong buy rather than a risky stretch: comparable B139/BD139-used listings are commonly much higher, with individual used examples showing up around €75–€380 and a new/stock-style replacement listing at €129 for the pair. Even allowing for the fact that this is a niche vintage driver/subwoofer part and exact condition matters, €45 is comfortably below the typical used ask and looks like bargain territory if it’s complete and functional.
The appeal here is the KEF pedigree: these vintage oval bass units are well regarded for their musical, clean low-end character and are sought after by restorers and DIY builders, so demand tends to stay firm. The real upside is if it’s an original, healthy driver with a correct impedance and no voice-coil rub, tears, or refoam needs; at this price, a buyer can justify some restoration work, but you still want to verify physical condition and any included pair/matching details before jumping.
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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