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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
At €75, this KEF BD139 passive radiator pair is a bargain compared to the obvious alternative of buying new replacements, which currently list around €129 for just two units. The asking price sits well below the typical used market for these vintage KEF SP1082 parts, making it a strong deal for anyone restoring KEF Reference Series speakers like the 104 or 105.
These passive radiators are critical for the deep, clean bass extension that defines KEF’s Reference Series, and finding a matched pair in usable condition is increasingly rare. Their value lies in preserving the original sonic character of high-end KEF cabinets where new parts may not match the vintage tuning. Unless there’s visible damage to the foam surrounds or mounting frames, this is a worthwhile buy for a restoration project at a price that rewards the seller’s quick sale.
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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