DENON PRA-2000RG

Commentary

This is a stereo control amplifier developed with our original technology as a device for enjoying music in excellent sound as well as pursuing advanced characteristics and performance.

In order to bring out the characteristics of the balanced transmission system, we have newly developed and installed an inverted Σ balance circuit.
All the amplifying elements are composed of discrete elements using high-performance and high-quality parts. The power supply voltage is approximately three times (± 47 v) higher than that of the conventional method. In addition, DENON's unique non-feedback technology is further developed into a distortion eliminating circuit method to achieve low distortion and high S / N ratio.

The FET input method is adopted in all stages, making use of the characteristics of FET such as "little time delay in signal transmission", "very large input impedance does not affect the input / output circuit", and "excellent sound quality because no odd order harmonic distortion occurs".

In the flat amplifier section, all the amplifying elements are composed of FET, and good rise characteristics are obtained.
The first stage consists of differential amplification of an ultra-low noise FET, combined with a cascode bootstrap method to reduce feedback between input and output and to greatly improve linearity.
In addition, the pre-driver stage using MOS FET (Pc30W) has a cascode bootstrap and P-P system similar to the first stage to greatly improve linearity and improve low-distortion and high-frequency characteristics. In addition, the final stage using MOS FET (Pc30W) is composed of a source-follower circuit to achieve both high input impedance and low load drive characteristics.

The equalizer amplifier employs a MOS Power FET (Pc30W) at the output stage to obtain the maximum allowable input for wide dynamic range reproduction, and to increase the speed of signal transmission and improve the low-load drive characteristics.
For the input stage, we use high-quality parts selected by our own standards for ultra-low noise FET. In addition, we use cascode bootstrap configuration to reduce feedback between input and output and reduce performance degradation due to characteristic fluctuation of the cartridge connected to the input terminal.
The MC input uses an MC transformer with an LC-OFC winding with a step-up ratio of 1 : 20 for high-end cartridges.
When the Phono input is not in use, this equalizer circuit can be switched on/off to completely shut off the circuit and the power supply, thereby reducing the influence on other circuits.

A wide-band LC-OFC winding balanced input transformer is mounted on the CD-2 balanced input.
Unlike the IC-based operational amplifier system, it has natural characteristics.

It is equipped with a power supply circuit centered on an LC - π type power supply circuit using a large choke coil in order to cut off the influence of noise from digital devices.
It consists of four constant power supplies for each unit including the last three of the LC - π type power supply. Current is supplied along the shortest path to the equalizer amplifier, flat amplifier, balance amplifier and control circuit, eliminating interference between each unit.
In addition, large toroidal transformers, fast recovery diodes, very thick power cords, and high-sound condenser are used.

Equipped with 4 large main large main volume that can be arranged in parallel with 2 channels each of L and R channels.

It uses a chassis with large weight feet and thick plates based on sintered metal, and copper plating is used for the front chassis.

Epoxy glass composite substrate is used for the print base material.

Input switching uses soft touch operation by electronic switch and relay.

Model Rating

Type	Preamplifier
Equalizer Amplifier Section (Phono In-Rec Out)
Input Sensitivity / Impedance	Phono MC : 125 μ V/40 Ω Phono MM : 2.5mV/47k Ω
Maximum Allowable Input (1 kHz)	Phono MC:25mV Phono MM:500mV
Maximum Output / Rated Output	30V/150mV
Total harmonic distortion factor	Phono MC ~ Rec Out : 0.01% (10 v, 1 kHz) Phono MM ~ Rec Out : 0.005% (10 v, 20 hz ~ 20 khz) CD1-PreOut1 : 0.005% (10 v, 20Hz-20kHz) CD2-Pre Out2 : 0.005% (10 v, 1 khz)
RIAA deviation	Phono MM : 20 Hz to 20 kHz ± 0.3 dB Phono MC : 20 Hz to 20 kHz ± 0.2 dB
S/N(IHF-A)	Phono MC : 80 dB (250 μ V input) Phono MM : 90 dB (2.5 mV input)
Subsonic filter	16 Hz, 6dB/oct.
High-Level Amplifier Section
Input Sensitivity / Impedance	CD1, Tuner, AUX1, 2 : 150mV/20k Ω CD2 (Balanced) : 150mV/2k Ω
Maximum Output / Rated Output	10V/2V
Total harmonic distortion factor	CD1, Tuner, AUX1, 2 : 0.005% (10 v, 20 Hz-20 kHz) CD2 (Balanced) : 0.005% (1 v, 1 khz)
Frequency characteristic	CD1, Tuner, AUX1, 2 : 1 Hz to 100 kHz + 0 -3dB CD2 (Balanced) : 20 Hz to 50 kHz + 0 -3dB
S/N(IHF-A)	105dB
Muting	- ∞ dB (LED flashing indication)
Tone control	Bass : ± 10 dB (100 Hz) Treble : ± 10 dB (10 kHz)
<General>
Power supply voltage	100 VAC, 50Hz/60Hz
AC outlet	Power switch not linked : 1 system (700W)
Power consumption (Electrical Appliance and Material Control Law)	29W
External dimensions	Width 476x Height 144x Depth 388 mm (Including Knobs and Legs)
Weight	16.5kg