Pre/Power Amplifiers

You can tell a lot about a company from the title it takes for itself – from the name of the founder to classical or musical allusions to the equivalent of go-faster stripes, every brand seems to set out its stall in a somewhat different way. German manufacturer T+A elektroakustik is no exception, except here the name – the initials stand for 'Theorie und Anwendung', Theory and Application – is saying 'we're no-nonsense, and led by engineering'. Or, as the company puts it in a brief bio, 'Actually we're scientists…'.

Tipping the scales at a hefty 26kg, measuring a portly 46cm deep and 17cm tall, and selling for £14,900, T+A's PSD 3100 HV appears every inch the flagship DAC/streamer/preamp. Except that it isn't – that accolade is reserved for the German brand's SDV 3100 HV [HFN Oct '19], which has been deemed its 'reference' model since its arrival in 2019 and remains available for £26,040.

Who buys top quality hi-fi equipment? First there is the audiophile, who is willing to devote considerable resources in the pursuit of components that deliver what he or she regards as the best sound quality for a given budget. There was once also a largely non-technical group who had equally high musical expectations. Wealthy and design conscious, they wanted complete systems that not only sounded good but looked good too, and included all the latest technological refinements.

Threshold has been making high-quality amps for many years, its preamps showing early use of FET circuitry and the power amps distinguished by an output stage design which Threshold calls 'Stasis', a kind of active Class A operation. Company founder and chief designer, Nelson Pass, remains fully involved and his signature appears on the circuit diagrams included in the excellently documented operating manuals supplied with the units.

Streetwise. Now there's a word. I suppose you could say that in a hi-fi context it means being aware of the unwritten myths, such as 'image depth is due to microphony in valve amplifiers' or 'Class A amplifiers sound better than ones operating in Class B' or 'the only truly great preamplifiers use valves'.