Denon POA-7700 (1989)
The POA-7700 is the odd one out in Denon's late-1980s monoblock lineup. Almost nobody can pin down its full story. It belongs to the "twin" series of mono power amplifiers alongside the POA-4400 and POA-6600. Externally the 7700 and 6600 are identical, and only the 4400 is slightly smaller. Inside is where they differ, and the 7700's interior is packed to the brim with no empty space.
What is documented comes mostly from Japanese and Russian-language sources. The POA-7700 was produced in 1989, originally priced at ¥145,500 per unit. Each monoblock weighs 19.5 kg and measures W310×H207×D456mm. Japanese market documentation describes Denon's unique bias circuit, which uses a non-switching system aimed at reducing switching and crossover distortion for purer sound at low output levels. The amp is described as compatible with digital sources and capable of driving low-impedance speakers.
The amplifier belongs to Denon's second generation of NonFB (no negative feedback) and RealBias designs, following the POA-8000. One Russian owner on the Overclockers forums reported the monoblocks "sound good, in their soft manner" - similar to a tube amp, with strong bass but a midrange that recedes somewhat unless the music isn't bass-heavy. The same source notes the 7700 most likely differs from the 6600 in higher supply voltage, larger capacitors (directly visible), and possibly different output transistors. He flags this as speculation, not confirmed fact.
The record on the POA-7700 is thin. No frequency response, THD figures beyond the 0.002% cited in power output context, damping factor, or input sensitivity data has surfaced. There are no dimensions beyond the above, no circuit-level detail on what actually separates the 7700 from the 6600, and no corroboration between independent sources for most claims. A 2026 Yahoo Auctions listing for an untested unit started at 1 JPY. An earlier 2015 auction for a working unit closed at ¥80,000. Japanese listings describe the amp as "super rare," and Russian sources call it Denon's "secret model - data not found, but available for sale."
Known Specifications
- Type: Monaural power amplifier
- Year: 1989
- Original price: ¥145,500 (per unit)
- Dimensions: W310 × H207 × D456mm
- Weight: 19.5 kg
- Output: 270W @ 8Ω / 0.002%
- Voltage: 100V (Japanese market)
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