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This £656 asking price sits comfortably between the median (£465) and the 75th percentile (£1,121) for recent GBP listings, making it a fair but slightly ambitious deal for a unit in “Excellent” condition with the original remote included. While it’s above the typical median, the inclusion of the remote and the excellent state justify the modest premium, especially since comparable power-amplifier-only listings often run higher (e.g., £1,395 for the SDA 2175 power amp alone).
The Lyngdorf/Tact SDAI-2175 is a well-regarded solid-state integrated that delivers clean, high-dynamic power and precise digital-to-analog conversion, prized for its neutrality and headroom. Its original-owner condition and intact remote add meaningful upside, as these accessories are often missing on used units. At this price, it’s a solid buying opportunity for enthusiasts seeking a high-performance integrated without the cost of newer models, provided the unit has been tested and shows no signs of age-related failure.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
TACT Audio emerged in the late 1990s as a pioneering force in digital amplification, debuting the Millennium at the 1997 Stereophile Show as the world's first true digital amplifier using pure Pulse Width Modulation (PWM) technology. This Danish innovator quickly gained attention for bridging digital signal processing directly to loudspeakers, minimizing analog conversion losses. While a separate Chinese entity, TACT Pro Audio, launched in 2013 focusing on professional speakers and systems, the hi-fi brand's heritage centers on its early breakthroughs in high-resolution audio electronics.
The brand specializes in cutting-edge digital amplifiers like the renowned Millennium series, including models such as the 2150 and 216, alongside stereo digital preamplifiers like the 2.2x with dynamic room correction supporting up to 96kHz/24-bit PCM. Their lineup emphasizes PWM amplification and innovative DSP for precise sound reproduction, targeting audiophiles seeking digital purity over traditional analog designs. Speakers and related pro audio gear appear in later iterations, but TACT's core strength lies in amplification and correction tech.
Positioned as a niche high-end boutique in the hi-fi market, TACT commands respect among knowledgeable buyers for its trailblazing digital innovations, though its visibility has waned amid service complaints and apparent dormancy. Collectors and digital amp enthusiasts prize vintage Millennium units, while the brand's forward-thinking approach continues to influence modern Class D designs.
See all TACT Audio listings on RADAR.
