DENON PMA-2000

Commentary

This pre-main amplifier inherits the design philosophy and technology of the high-end audio S1 series.

A high-current amplifier UHC MOS with a peak current of 120A is used in the output stage.
The current supply capability of the UHC MOS is improved to a level equal to or higher than that of the bipolar transistor, and it also has the sound quality advantage of the MOS FET. By mounting this UHC MOS in a single push-pull configuration, dispersion of amplification operation is eliminated.

It uses twin transformer parallel connection that greatly improves the characteristics of both magnetic circuit and winding circuit developed in the monaural power amplifier POA-S1.
In addition, by using L and C mounts that mutually cancel the influence of magnetism, the leakage flux of the power transformer, which is a source of noise in the amplifier, is reduced, and high power supply capability and low noise are realized.

The rectifier circuit is connected in parallel with a large rectifier diode with excellent large current supply capability and a Hurst recovery diode with greatly improved operation speed, so that it can handle high speed and large current for better operation.
In addition, the power capacitor that stores DC power is equipped with a combination of a high-capacity high-sound electrolytic capacitor and a film capacitor with different frequency characteristics, enabling stable current supply in the entire range of the reproduction frequency.

In order to eliminate degradation of sound quality due to interference between circuits and inflow of noise, the power amplifier block is made into a twin monaural configuration with independent L/R, and a 6-block structure with separate circuits with different signal levels is adopted.
This eliminates the effect of interference between blocks on sound quality, and achieves better playback.
In order to ensure high rigidity, a steel plate with a thickness of 1.6 mm is used for the chassis. In addition, a transformer base is added to the power transformer part to prevent vibration, and the chassis has a strong structure with a thickness of 3.2 mm.

The speaker terminal is gold-plated with brass for a more reliable connection.
In addition, two systems are available for bi-wiring.

It is equipped with a phono equalizer that uses a discrete first stage circuit using a low-noise FET.
Both MM and MC cartridges can be used by switching the switch.

In addition to the large (27-inch) volume, highly reliable parts such as OFC internal wiring materials, inert gas-filled relays, high-sound carbon resistance, and high-sound capacitors are used.

Model Rating

Type	Pre-main amplifier
Power Amplifier Unit
Rated output (both channel drive CD → SP OUT)	160W + 160W (4 ω, 1 khz, 0.7% THD) 80W + 80W (8 ohm, 20 hz to 20 khz, THD 0.07%)
Total harmonic distortion factor	0.01% (Rated Output -3dB, 1 khz, 8 Ω)
Speaker output terminal	A, B : 4 Ω ~ 16 Ω A + B : 8 Ω ~ 16 Ω Bi-wiring load : 4 Ω ~ 16 Ω
Headphone	Stereo headphone compatible
Preamplifier Section
Equalizer amplifier output	Rec Out : Rated 150 mv
Input Sensitivity / Impedance	Phono MM : 2.5mV/47k Ω Phono MC : 0.2mV/100 Ω Line : 150mV/47k Ω (source direct off) 150mV/13k Ω (Source Direct On)
RIAA deviation	Phono : 20 Hz to 20 kHz ± 0.5 dB
<General>
Signal-to-noise ratio (A network)	Phono MM : 91 dB (when the input terminal is short-circuited and the input signal is 5 mV) Phono MC : 76 dB (when input terminal is short-circuited and input signal is 0.5 mV) CD, Tuner, DVD/Aux, Aux2, Tape1/DAT, Tape2/MD : 110 dB (input terminal short circuit)
Tone control	Bass : 100 Hz, ± 8 dB Treble : 10 kHz, ± 8 dB
Power outlet	Switched : 2 systems, total capacity 120W Unswitched : 1 line, 240W capacity
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption	250W
External dimensions	Width 434x Height 180x Depth 478 mm
Weight	20.0kg