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Optimus Prime's Stereo Equipment Old School Audio - Old School Prices - Professionally Tested Product Description This Denon AVR-687 5.1 channel home theater receiver has been fully tested and confirmed working. All amplifier channels, AM/FM tuner, and onboard Dolby Digital and DTS decoding have been verified in proper operation. The unit is in good cosmetic condition with minor wear consistent with normal use. Remote not included. Please review all photos for details. Highlights At A Glance ✔ Fully tested and verified ✔ Good cosmetic condition with minor wear from use ✔ Free 30-day returns ✔ Fast, insured shipping Testing & Verification All five amplifier channels were tested for clean output at various volume levels with no distortion, noise, or channel dropout. The AM and FM tuner was verified to lock onto stations clearly, and all inputs including analog and digital audio were confirmed functional. Balance, tone, and surround mode controls all operate as expected. Shipping & Returns Fast, insured shipping from Minnesota. Free 30-day returns. Item is carefully packaged for safe delivery.
At US$80, this is a fair-to-good buy for an AVR-687-class Denon; that’s well below the old midrange launch pricing and comfortably in the “used bargain” zone for a working unit. The available market signals show similar-era Denon AVRs like the AVR-687/688 floating around roughly US$100–US$150 used, with refurb listings higher, so US$80 is attractive if it powers up cleanly and includes the remote.
What makes it worth a look is the solid Denon build, 7.1-channel layout, and the useful old-school feature set: Dolby Digital EX/DTS decoding, component switching, and multi-zone capability. It’s a sensible pickup for a secondary theater, garage system, or someone running legacy sources. Main buy-in is condition: on a receiver this age, you want clean HDMI/component switching? No—more importantly, verify all channels, relay clicks, input selection, and that there’s no protection-mode behavior, since age is the real risk here.
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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