Martin Colloms

Our feature review series has been planned to include audiophile and flagship CD models, and that is certainly an accurate description of the magnificent-looking Yamaha CDX-10000. This forms a major component in a new series of limited edition audio separates which have been designed and built with virtually no concession to cost in celebration of Yamaha’s centenary. This covers the period 1887 to 1987, and the models are appropriately entitled the ‘Centennial Edition’.

Sitting in a neat stack on the desk in front of me as I write, the subjects of this review remind me of those pretty Toshiba Aurex units of yesteryear [HFN Apr '16]. There are three Micromega components in all: the Microdrive CD transport (an improbably small device, this); the Variodac, comprising a Bitstream digital-to-analogue converter with remote power volume control and an additional line input; and finally, the Microamp, a neat-looking stereo power amplifier block.

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.