Pre/Power Amplifiers

Binary beauty US valve stalwart Audio Research has launched its first Class D power amp and as Jimmy Hughes reports, its 450 watts prove addictive Given its penchant for producing large, heavy, behemoths, Audio Research’s launching of a Class D power amp is more than slightly surprising. While Pure Class A still sets a benchmark when the highest quality results take precedence, there are many practical drawbacks – excessive heat, large size, high price, massive power consumption – need one go on? The DS450, on the other hand, features an analogue-based Class D pulse-width modulated switching output stage. High output power, low-running temperature, low-power consumption and excellent sound quality are promised. But can such clever technology really challenge Class A’s sonic supremacy? Up the stakes Like most power amps, the DS450 is fairly simple.

Somewhere around the turn of the millennium, hi-fi started getting interesting again – with DVD-Audio and SACD arriving, MP3 going gangbusters and computer audio taking hold. Then asynchronous USB conferred hi-res capability on Macs and PCs, and now easy wireless has come of age thanks to aptX Bluetooth. Cambridge Audio’s new flagship DAC is a product of all this. Packed with most of the functionality that has popped up over the past decade, it purports to be a ‘greatest hits of digital’ in one convenient package.

Cayin and able Jimmy Hughes auditions newcomer Cayin and its retro-inspired pre/power that's giving the high- end establishment a run for its money Cayin is the brand name of Zuhai Spark Electronic Equipment Co. – a Chinese company making good-value, high-end electronic products. The unashamedly retro- looking SP-30S and SP-40M tube pre/power amp is one of its tastier offerings, with the promise of excellent performance at a realistic price. But, what should one expect from an amplifier like this? It used to be oh-so simple; tube amps sounded rich, warm and friendly, while solid-state types were lean, mean, and bitingly sharp.

Cyrus Pre XP D/8 power - £1,350/£875 A traditional-sounding pre/power amp combi from Cyrus, that works hard to establish itself against the competition Built, as ever, into the famous Cyrus diecast chassis, these units are picked from among the comprehensive range of pre and power amplifiers in the company’s catalogue. To some extent we’ve chosen an unusual pairing as the preamp significantly exceeds the power amp in price and its usual partner would be the X Power, but apart from anything else, Cyrus offers an upgrade path to take the 8 to X status, so the model chosen initially matters less than usual. In addition, the preamp includes DAC functions so its price can fairly be thought of as including a DAC, as well as an analogue pre. We mentioned upgrades and this is a major attraction of Cyrus.

The preamp that gives off a nice warm glow...

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