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At US$630, this is well above the recent used market for the model: against 11 comparable listings, it clears the US$448 75th percentile by a wide margin and is far above the US$134 median. That makes it an ambitious asking price, not a fair-market one, unless this example comes with something genuinely special that the listing isn’t showing.
What still makes it interesting is the product itself: the Pietus Maximus is a respected desktop amp/DAC combo, known for clean drive, punchy dynamics, and a no-nonsense sound that pairs well with plenty of headphones. If the unit is truly clean and includes the original box, power supply, and any accessories, that helps, but at this price I’d want confirmation of condition, functionality, and exact DAC/amp configuration before paying up.
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.
