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The AU-320 has a strong reputation as a simple, quiet, well-matched step-up transformer for low-output MC cartridges, especially Denon designs. At US$200, this is a strong deal: it sits just above the US$196 25th-percentile mark but well below the US$221 median and US$253 75th percentile from recent comparable listings.
Its switchable 3-ohm and 40-ohm settings make it versatile, while the passive transformer design, good hum rejection, and lively but balanced presentation explain its enduring appeal. That price is particularly attractive if the original interconnects are included and both channels have been confirmed quiet and functional. Since the listing says condition is unknown, verify the selector switches, RCA sockets, cable integrity, and channel balance before committing; otherwise, this is a very worthwhile buy rather than an ambitious ask.
Independent perspective — not a price guarantee. Always verify condition, accessories and provenance before purchase.
Denon traces its origins to 1910, when American entrepreneur Frederick Whitney Horn founded Japan's first audio equipment company, Nipponophone, initially focused on gramophones and records. The Denon brand emerged in 1939 from the merger of Japan Denki Onkyo—combining "den" for electricity and "on" for sound—with other entities, marking a shift toward professional audio development. This heritage includes pioneering Japan's first professional disc recorder in 1945, used to capture Emperor Hirohito's voice, and launching the nation's first long-playing records in 1951.
The brand excels across a broad spectrum of hi-fi categories, from amplifiers, turntables, and tuners to loudspeakers, cassette decks, and phono cartridges. Denon's innovations extend to digital frontiers, such as the world's first practical PCM recorder in the early 1970s, the inaugural CD player in 1981, and early home theater systems with Dolby Digital in 1995. Today, its lineup encompasses AV receivers, headphones, wireless streaming solutions like HEOS, and high-channel processors, blending professional-grade components with consumer accessibility.
Denon holds a commanding position as a mid-to-high-end mainstay in the hi-fi market, revered for its blend of technological firsts, robust build quality, and balanced sound signatures that appeal to discerning enthusiasts. No longer a vintage collector's niche, it competes confidently against premium rivals, backed by over a century of audio leadership and strategic partnerships like its merger with Marantz.
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