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Castle Acoustics Knight 4 Floorstanding Loudspeakers Castle Knight 4s in great condition - a very tidy pair that has been very well looked after. No noticeable scuffs or scratches, grills are pristine, surrounds are in great shape and have no signs of wear. 25 -150w @ 8omhs 90db sensitivity 36hz - 24khz 900mm tall on spikes 12.5kg a piece They sound amazing, great detail and a wide sound strange for their size. Perfect for an apartment or medium sized room. They pair very nicely with warm vintage gear to my ear and are easy to drive. They stand on steel floor spikes with little rubber cushions
At A$700, this is fair to slightly good money for a Castle Knight 4 pair, which sat around £799.95 new in the Knight range and has been seen used at about £295 in the UK market, putting a reasonable AUD used target in the roughly A$550–A$800 zone depending on finish and condition. So this is not a bargain-basement score, but it is a credible buy if the cabinets and drivers are clean.
The Knight 4 is well liked for its easy 90 dB sensitivity, 8-ohm load, and compact floorstander format, making it friendly to a wide range of amps while still giving that smooth, room-filling Castle presentation. If the finish is tidy and the original grilles/spikes are present, A$700 makes sense; I’d mainly check for veneer damage, driver ageing, and any crossover crackle, because on a speaker this age the condition is what separates a solid buy from a merely okay one.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Castle Acoustics, a revered British loudspeaker brand, traces its origins to September 3, 1973, when it was founded in the North Yorkshire market town of Skipton by William "Bill" Escott and John Collinson. Both veterans of Wharfedale—and Collinson also of Quad—these engineers established the company in an old woollen mill, drawing its name and logo from the historic Skipton Castle. From the outset, Castle emphasized complete in-house production, crafting drive units, electronic components, and hand-veneered wooden cabinets under one roof, setting it apart in the 1970s hi-fi landscape.
The brand has steadfastly focused on high-fidelity loudspeakers, eschewing diversification into amplifiers, turntables, DACs, headphones, or cables. Iconic models like the Howard, Harlech, Durham, Pembroke, and later Knight series exemplify its commitment to premium wood-veneered enclosures, woven carbon-fiber bass drivers, and cutting-edge acoustic engineering. Acquired by the International Audio Group in 2007, Castle has expanded into home cinema while preserving its two-channel heritage.
Positioned as a high-end boutique manufacturer, Castle commands respect among discerning hi-fi enthusiasts for its "no compromise" sonic performance, furniture-grade craftsmanship, and timeless musicality. Award-winning designs, such as the Knight series lauded by Hi-Fi Choice and Hi-Fi World, underscore its enduring appeal in the premium market, blending British tradition with modern innovation.
See all Castle Acoustics listings on RADAR.
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