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This is a seller’s market only if the unit is exceptional; at US$650, this listing is well above the used-market norm. Your 16-comparable sample puts the median at US$127, with the 75th percentile at US$531, so US$650 is ambitious rather than a bargain—especially with the condition unspecified.
The Pietus Maximus is a genuinely appealing, distinctive solid-state amp: powerful, warm-leaning, smooth, and capable of driving demanding headphones, while the ESS card makes it a convenient DAC/amp combination. New pricing and enthusiast impressions support its quality, but they don’t erase the gap to the comparables. At this ask, buy only if it is near-mint, complete with the original accessories, and you specifically want its integrated ESS DAC and rich presentation; otherwise, negotiate materially or wait for a lower-priced example.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
ESS is best known as ESS Technology, a U.S. semiconductor company founded by Forrest Mozer in 1983 as Electronic Speech Systems. It began in California and grew from speech and multimedia chips into a specialist in audio conversion silicon, with its later identity strongly tied to digital audio technology rather than finished consumer hi-fi products.
The company’s core focus is audio DACs and ADCs—especially the SABRE family—used by manufacturers in audio, mobile, automotive, and professional equipment. In hi-fi terms, ESS is not primarily a maker of amplifiers, speakers, turntables, or headphones; instead, it supplies the conversion chips that sit inside many third-party components.
In the market, ESS has a technical, high-performance, component-supplier reputation rather than a consumer brand identity. Among informed audiophiles it is often associated with high-end and upper-mid-tier digital playback, while also being somewhat niche because its name usually appears inside other brands’ products rather than on the front panel. It is a respected engineering brand, but not a vintage collector name in the usual sense.
See all ESS listings on RADAR.
