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Life partner Audiovector’s 'upgradable' speakers can be improved when funds allow. Paul Messenger investigates a unique proposition from Denmark The Ki-series is relatively new and also relatively inexpensive by Audiovector’s standards. The Ki 3s are the sole floorstanding models in a range that also includes a standmount and home cinema oriented variations. But each Ki-series model comes in three versions – Standard, Super and Signature – with superior engineering features as one moves up the ladder.

Cabasse Bora This substantial model is a genuine three-way, due to its special proprietary co-axial driver France’s oldest hi-fi speaker brand, Cabasse is now owned by Japanese multi-national Canon, though its Britanny heritage remains strong, with members of the Cabasse family still involved. A major technology plank is its particular proprietary approach to co-axial driver design. Cabasse’s BC13 co-axial drive unit is very much at the heart of this £2,200 per pair Bora, as well as the main reason why it’s the only three-way design amongst our standmounts. This driver uses an annulus or ring-shaped midrange diaphragm, surrounding the tweeter proper and nominally operates from 800Hz to 4.

Monitor Audio Platinum 100 This baby model in Monitor Audio’s gorgeous Platinum ‘flagship’ range features a ribbon tweeter Founded in 1972, Monitor Audio now qualifies as one of Britain’s longest established speaker brands, especially amongst those still in UK ownership. Although it’s best known for successful ‘mainstream’ models like the Bronze and Silver series, the company took a significant step towards the high end in 2007, with the introduction of Platinum models like this £2,500 per pair Platinum 100 two-way standmount. A ribbon tweeter is the hallmark of all the Platinums and here it’s combined with a 165mm bass/mid driver in an exceptionally solid and beautifully finished enclosure with a decidedly complex shape. The back and sides are formed as a continuous curve, with mildly convex sides, a slightly concave back and quite gently curved edges.

Spendor SP2/3R2 This speaker might look old-fashioned, but that’s really the whole point of Spendor’s Classic range Spendor arrived on the scene at the beginning of the 1970s, bringing a strong BBC heritage along with a number of interesting innovations that its competitors arguably didn’t fully appreciate. One of the most significant among these was a radical approach to enclosure design. The theory goes as follows: building an exceptionally stiff structure might serve to reduce the amplitude (ie relative loudness) of cabinet vibrations, but it also increases the frequency at which they occur, so that the enclosure coloration tends to occur in the midband where human hearing is most sensitive. The alternative Spendor approach, originally inspired by the BBC’s desire for accurate speech monitoring, is the ‘thin wall’ cabinet approach, backed by heavy damping pads, which pushes the cabinet wall vibrations down into the bass region where they’re considered less intrusive.