Denon PMA-580D (1988–1989)
The PMA-580D is a Japanese-market integrated amplifier from Denon's "D" series of 1988–1989, a lineup that also included the PMA-780D, PMA-880D, and PMA-890D. It was the junior model of the group — at 10 kg it was substantially lighter than its siblings, which started at 15.5 kg — and it carried an original price of ¥69,800. The series appears to have been built for the domestic Japanese market, and it has no direct relation to the later PMA-480R through PMA-1080R line that Denon produced for international markets in 1992–1994.
The interesting part of the 580D is its early use of digital inputs in an integrated amplifier. It has one optical digital input and a coaxial digital input mounted on Route 3, feeding a built-in D/A converter based on Denon's "Double Super Linear Converter" system. That system used independent left and right converter pairs to eliminate conversion error at large input levels and avoid inter-channel time differences. A 4× oversampling digital filter handled linear phase correction, and a digital multi-interface demodulation circuit automatically recognized incoming sampling frequencies. The front panel text advertises "Real Time Audio Technology" alongside the converter branding.
Denon kept the digital and analog sides apart. The interface circuit had its own dedicated power supply, separate from the transformer's secondary side. The whole digital section sat in a shield case that also damped chassis vibration. A digital direct input switch sent the converted signal straight to the power amplifier and bypassed the preamp stage entirely.
The amplifier section was rated at 100W + 100W into 8 Ω (20 Hz - 20 kHz), with 120W into 6 Ω and dynamic power of 230W into 2 Ω. THD was specified at 0.005% at 50W into 8 Ω. The output stage used a high-speed, large-capacity transistor in a single push-pull operation, with a low-noise op-amp at the first voltage gain stage. The power supply had a 400 VA toroidal transformer and four 8,200 μF filter capacitors. A subsonic filter was included for phono use, and the phono stage handled both MM (2.5mV/47kΩ) and MC (0.2mV/100Ω) cartridges. One unusual detail: speaker terminal B used a direct connection without a switching relay, which reduced transmission loss.
The DAC section's measured performance was respectable for the era. Frequency response was 5 Hz - 20 kHz ±0.3 dB, signal-to-noise ratio was 105 dB, dynamic range was 96 dB, and THD was 0.003% at 1 kHz. Line inputs offered a strong 108 dB S/N ratio.
Documentation on this model is thin. The most complete specification record comes from audio-database.com, and a Russian owner's write-up on drive2.ru provides the family context. No period magazine reviews have surfaced, and no owner forums discuss it in depth. A used listing on HifiShark showed a $550 asking price in January 2026, and at least one eBay listing has offered the unit "for parts" - these are now thirty-five-year-old electronics. One owner on the drive2.ru thread observes that by design the 580D visually fits with the PMA-980 series rather than its own 780D/880D siblings, though this is an observation, not a documented fact.
- Rated output: 100W + 100W (8 Ω), 120W + 120W (6 Ω), 20 Hz–20 kHz
- Dynamic power: 230W / 2 Ω
- DAC: Double Super Linear Converter, 4× oversampling digital filter, coaxial + optical inputs
- Phono: MM 2.5mV/47kΩ, MC 0.2mV/100Ω, subsonic filter
- Power consumption: 167W
- Dimensions: 434 × 143 × 390 mm; weight: 10.0 kg
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