From the Vault

Apr 1992

My patience was put to the test with the Naim CDS. As I unpacked the two units and coupled them together I experienced a flush of old 'brand loyalty'. Since the days of the original 12S preamp and NAP160 power amp, my meetings with company founder Julian Vereker had been cordial and I had spent several pleasurable years with my NAP250. My frustration came with the waiting time for the player to warm up before listening began.

Feeling a bit like the boy who cried ‘Wolf!’, I still can’t help but regard this new range of speakers from Apogee as ‘ribbons for the masses’. But unlike the last models that inspired this sort of reaction – the Stages [p129]and Calipers – the new Centaurs really do make Apogees accessible to a wide range of consumers. And not only by virtue of their cost.

As an increasing number of digital source components come equipped with variable output level one might think that line controllers – preamps without a phono cartridge input facility – are an endangered species. This will make sense to those embarking on an all-digital system, mixing a variety of digital sources and prepared to convert from the analogue disc domain to digital via an A/D converter function. Indeed, some digital control units are digital-only and cannot handle analogue signals at all.

American specialists, like their UK counterparts, continue to develop new variations on the available digital technology to produce DACs with audiophile appeal. This review covers two of the more intriguing examples, using some of the most advanced devices available to designers. The Enlightened Audio Designs DSP7000 is based on the 20-bit Analog Devices chip, while PS Audio has chosen an Ultra Analog dual 20-bit converter. What bearing the two choices of technology will have on sound quality remains to be seen!

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.

Conrad-Johnson's 'Anniversary Reference Triode' has been some time in the making. In fact, an early version was developed seven years ago which has since been used as a lab reference. The ART is simply a remote-controlled line preamplifier, which at £15,000 is priced far beyond any previous Conrad-Johnson offering in this sector. It will be made in a limited edition of just 250 – probably just right for a modest production run at this elevated price level.