Denon PMA-2000IV (2002)
The Denon PMA-2000IV is the fourth-generation pre-main (integrated) amplifier in the PMA-2000 series. It was released in Japan in March 2002 at ¥120,000. It weighs 23.5 kg. The output stage uses Denon's UHC (Ultra High Current) MOS elements in a single push-pull circuit, and Denon claims current delivery of 3 to 10 times that of conventional output devices.
Rated output is 80W + 80W into 8 ohms (20 Hz-20 kHz, 0.07% THD) and 160W + 160W into 4 ohms at 1 kHz. The power supply uses a High Current Dynamic circuit with a Schottky barrier diode and a newly developed block electrolytic capacitor. Two transformers are connected in parallel with an L.C. (Leakage Canceling) mounting method to reduce flux noise. The chassis is a 6-block separated structure made from 1.6 mm black-treated steel plate. Denon calls the grounding approach Precision Mechanical Ground, and it mounts the heatsinks directly near the feet to control vibration.
The phono stage is a discrete FET-first-stage equalizer with its own power supply. It supports both MM (2.5mV/47kΩ) and MC (0.2mV/100Ω) via rear-panel switches. There's a pre-out and a power-direct input. The pre-out comes from the same discrete MOS-FET flat amplifier used in the PRA-S1. Frequency response extends to 100 kHz (-3dB), and line input sensitivity is 135mV. The speaker terminals are gold-plated brass with φ6mm clamp holes, and there are two outputs for bi-wiring. A service manual exists under the designation PMA-2000IVR. The two names appear interchangeably in period listings, and no source says whether they are distinct variants or the same unit.
Documentation on this model is otherwise thin. One owner on Audio Asylum (December 2003) called the PMA-2000IVR "a great value for a general purpose integrated amp," running it in a bedroom system with Tannoy S8LR speakers. No formal period reviews, production totals, or common-failure information have surfaced. The unit still turns up on the secondhand market, with recent asking prices from roughly $550 to $1,150 depending on condition and region.
Known Specs
- Output: 80W + 80W (8Ω, 20 Hz–20 kHz, 0.07% THD); 160W + 160W (4Ω, 1 kHz, 0.7% THD)
- Phono MM: 2.5mV/47kΩ; Phono MC: 0.2mV/100Ω
- Line input: 135mV (47kΩ source direct off; 13kΩ source direct on)
- Frequency response: 5 Hz–100 kHz (-3dB)
- Dimensions: 434 × 180 × 478 mm; 23.5 kg
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