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This is an ambitious ask at US$900: it sits above the US$813 75th-percentile asking price in 362 comparable listings, rather than representing a typical used-market bargain. The missing power cord also means the buyer should budget for the correct replacement and confirm the unit’s voltage and operation before paying a premium.
The KASA500 is a serious, purpose-built subwoofer amplifier, offering dual 250-watt Class-D channels, DSP configuration, line- and speaker-level inputs, and rack-mount flexibility. It makes particular sense for KEF Ci passive in-wall subwoofers, where its tuning and power can be valuable. At US$900, the working test and included rack ears are positives, but the price would be more compelling closer to the market median of US$395; unless it is exceptionally clean, recently serviced, or difficult to source locally, there is room to negotiate.
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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