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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.



H.H. Scott '59





Denon DRA-400 receiver

Quartz Synthesizer FM/AM Stereo Class-A Receiver

Non-Switching A circuitry can also be heard in the DRA-400. in addition to its built-in Moving Coil Head Amp and Digitally Synthesized FM tuning. With the DRA-400 Denon has made a new standard of listening quality available to those demanding economy and operating convenience in a compact package.

 


Features:

Class-A circuitry for clean, powerful sound

10 station preset memory

Quartz synthesizer tuning for crystal-accurate reception

 


Specifications

Continuous Power Output:

40 watts per channel min. RMS, both channel driven at 8 Ω  from 20 Hz -20 kHz no more than 0,02% T.H.D. (45 W per channel , 0,06% T.H.D.)

50 watts per channel min. RMS , both channel driven at 4 Ω  1 kHz, T.H.D. 0,009%

Power Bandwidth (IHF):  5 Hz - 40 kHz (T.H.D. 0,02% both channel driven at 8 Ω )

Total Harmonic Distortion:  0,02% (rated power into 8 Ω , 20 Hz = 20 kHz)

Damping Factor:  more than 80 (at 1 kHz, 8 Ω )

Preamplifier Section

Frequency Response

Phono RIAA Standard Curve (rec. Output) :  ±0,5 dB

Tape, AUX :  20 Hz - 20 kHz ±0,5 dB

Input Sensitivity/Impedance:

Phono MM :  2,5 mV/47 k Ω

Phono MC :  0,25 mV/100 Ω

Tape, Aux :  150 mV/ more than 33 k Ω

Max. Input Level (at 1 kHz)

Phono MM :  200 mV

Phono MC :  20 mV

Signal-to-Noise Ratio (IHF-A)

Phono MM :  80 dB

Phono MC :  62 dB

Tape, Aux :  96 dB

Tone Control Range

Bass :  ±10 dB at 50 Hz

Treble ±10 dB at 20 kHz

Loudness Control:  +10 dB at 100 Hz; +5 dB at 10 kHz (at -3 dB attenuation)

Subsonic Filter :  18 Hz, 6 dB/octave

FM Tuner Section

Receiving Range:  87,9 - 107,9 MHz (for E3, ECI); 87,5 0 108 MHz (For E2)

Mono IHF Sensitivity:  10,3 dBf

Signal-to-Noise Ratio (for E3, EC)

Mono :  75 dB

Stereo :  71 dB

Signal-to-Noise Ratio (46 dB Sensitivity) For E2

Mono :  2,2 mV

Stereo :  25 µV

Total Harmonic Distortion (1 kHz, 100% mod. For E3, EC)

Mono :  0,07%

Stereo :  0,15%

Total Harmonic Distortion 1 kHz, 40 kHz deviation For E2)

Mono :  0,1%

Stereo :  0,2%

Capture Ratio:  1,2 dB

Image Rejection:  45 dB

AM Suppression:  60 dB

Frequency Response:  10 Hz -15 kHz +0,5 dB -1,0 dB

Stereo Separation:  50 dB

AM Tuner Section

Receiving Range:  530 - 1620 kHz (for E3, EC); 522 - 1811 kHz (for E2)

Usable Sensitivity:  15 dBf (for E3, EC); 5,6 µV (for E2)

Signal-to-Noise Ratio:  55 dB

General

Power Supply:  AC 120 V, 60 Hz (AC  200 V, 220 V, 240 V 50/60 Hz)

Power Consumption:  130 W

Power Outlets:  100 W Switched; 1250 W Unswitched

Dimensions (W x H x D): 434 x 112 x 408 mm

Weight:  9 kg


 

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