Denon POA-800
It weighs 6.8 kg and stands just 12 cm tall, so it doesn't dominate the rack. Owners report that its 50-watt output sounds controlled and musical. HiFI-Stereo (February 1982, p.23) noted that Denon's high-end models of the era delivered performance close to their $8000 separates.
Overview
The Denon POA-800 is a dual-mono power amplifier from a period when Japanese engineering put reliability and measured performance ahead of flash. It was produced from 1986 to 1991. It isn't the flagship and it isn't the budget model. It's a no-frills stereo power amp for audiophiles who cared more about circuit integrity than extra features. It is 434 mm wide and takes three rack spaces, so it fits standard equipment bays. At 11.5 inches deep, it suits most shelves and cabinets. The 6.8 kg chassis feels solid without being excessively heavy, which suggests a high-capacity power supply but not the oversized transformers of higher-end contemporaries.
The POA-800 is rated at 50 watts per channel minimum RMS into 8 ohms from 20 Hz to 20 kHz. It doesn't chase headline power figures. Collectors note that it sounds more authoritative than the spec sheet implies, particularly with 4-ohm loads, which it is explicitly designed to handle. One listing confirms the minimum speaker load impedance as 4 ohms, which indicates an output stage that can deliver current into difficult loads. The claimed signal-to-noise ratio is 120 dB, which suggests very low background noise and clean amplification even at low volume. Some sources cite a higher figure of “90W x 2,” but they give no load impedance or measurement conditions. That makes 50W/8Ω the only verified power rating.
Optically Controlled Bias System
This system uses light-dependent components to regulate the bias current in the output transistors, theoretically offering more consistent operation across temperature swings than traditional potentiometer-based setups. It reflects Denon’s interest in long-term reliability and reduced maintenance, aligning with the “no-frills” ethos of the unit. While the exact implementation isn’t detailed in available documentation, the presence of such a system in a mid-tier amplifier was not common practice in the late 1980s,Dual-Mono Construction
As a dual-mono power amp, the POA-800 keeps the left and right channel circuitry separate to minimize crosstalk and channel interaction. This kind of design typically includes separate power regulation or even dual power supplies, though the fact sheet does not confirm whether the POA-800 uses a fully split supply. Period descriptions emphasize “advanced circuitry design,” which points to careful layout and grounding practices. According to user reports, the soundstage has precise imaging and a sense of control, a “musical” balance that avoids clinical sterility. It holds performance across the full 20 Hz - 20 kHz bandwidth at rated power, which indicates a stable, well-compensated design. Damping factor and THD figures remain undocumented.
Collectibility & Value
On Facebook, a July 2024 listing sought 2,800 (currency unspecified, likely local tender such as Philippine pesos) for a unit sold “as is” and noted as suitable for parts or repair. That indicates non-working examples hold some residual value. Original pricing in Germany was approximately 700 Deutsche Mark. No widespread failure modes or common maintenance issues are documented, but at this age the capacitors and thermal compounds may need servicing in unattended examples.
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