Loudspeakers

Has it really been more than 20 years since Acoustic Energy bridged the worlds of professional studio monitoring and domestic audio? Back in ’88, the former regarded the latter in the way that, say, Labour regards fiscal responsibility. AE was having none of it, and produced a classy, compact two-way monitor of true studio merit, sort of a UK answer to Wilson’s WATT. Given its diminuitive stature, most noteworthy was the AE1’s prodigious bass. Rear-ported and boasting a still-radical metal mid/bass driver, it begged to be positioned away from walls on solid 24in stands.

In this era of DSP room correction systems, surprisingly few loudspeaker manufacturers seem to be looking at the issue of room interaction from the speaker design angle, trying to find ways to quell the room’s influence and thus, potentially, render DSP assistance redundant. Danish company Dali is an exception, although to look at the Helicon 400 Mk2 you could be forgiven for thinking that it is an entirely conventional direct-radiating floorstander. The giveaway, although its significance may not be immediately obvious, is the trademark Dali twin tweeter module which combines a 25mm soft-dome unit with a leaf supertweeter whose diaphragm is 10mm wide by 55mm high. Supertweeters are normally deployed these days to extend response out to low ultrasonic frequencies but the Dali supertweeter also has an important function within the audible range, where it takes over from the dome tweeter at 13kHz.

I didn’t need much persuading to audition this sumptuous pair of floorstanders made by Revel, one of its flagship Ultima2 range. Priced a cool £11,000 they exude opulence from their sculpted front baffles in gloss black, highly lacquered cabinets finished in real wood veneer (ours were the mahogany version; also available in piano black) and hi-tech drive units. Revel’s Ultima2 range comprises the Studio2 that we have here, an even larger model called Salon2, a slim bookshelf that’s suitable for on-wall use dubbed Gem2 and the Voice2 centre speaker. Commensurate with price, attention to detail is fastidious; to ensure that each Ultima2 loudspeaker is matched to within a fraction of a decibel to its prototype reference, a final tuning process is conducted on all production units to ensure absolute uniformity.

Approaching a reviewer to assess a product is simple: the manufacturer or distributor contacts the magazine and they arrange delivery. That’s it. One assumes that the product is suitable for the magazine, and it’s up to the editor to assign the reviewer. But never in my 25 years as a reviewer have I been so nagged, badgered, pestered, henpecked and begged to write a review.

Martin Colloms hears KEF's no-holds-barred flagship speaker, the R109

In late 1995 an idea began to take shape at KEF Audio. The company had already produced some fair-sized 'reference' models, culminating in the well-regarded Reference Four. But even this powerful and accomplished design lacked the necessary weight and presence to make a major impact at the highest quality level of world loudspeaker sales. So research began to define the key elements of what was intended to be a much larger speaker system, a definitive engineering expression of the company's knowledge.

This slim design offers the traditional benefits of transmission line bass loading yet manages to overcome the drawbacks, says Martin Colloms

New ideas are being introduced at Celestion to bring its upmarket SL series into the 1990s. The first example, designed by Bob Smith, was the 100 [HFN Nov '91] followed now by the 300 reviewed here. This is a £1000 floorstander that aims to bring improved bass extension, power handling and superior dynamics to the genre, while sensitivity remains below average at 84dB/1W. A remarkable aspect of the 300 is its transmission line loading, a first for Celestion, and developed with an unusually authoritative theoretical approach, by the designer Martin Roberts.

With the latest Apogee, ribbon technology comes in a more affordable package. Ken Kessler's assessment follows Martin Colloms' review

The US company Apogee has expanded its range of open-panel loudspeakers, which began with the Apogee model itself. This was a large-scale design using three separate diaphragms, with pure aluminium ribbons for frequencies above a few hundred Hertz. Three other models are now in production, comprising, in descending order of size and price, the Scintilla [HFN Sep '85], Duetta, and now the so-called 'baby' of the group, the £2500 Caliper.