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





Onkyo TX-4000 receiver


A new era in tuning accuracy and convenience with Quartz Synthesized All-Pushbutton Memory preset Tuning, Dual Super Servo System , and Linear Switching.

The Onkyo TX-4000 Quartz Synthesized Tuner/Amplifier is one of the most perfect stereo receivers we've ever designed. Nothing else in its price range provides the brilliant purity, dynamic headroom, and full excitement of its sound.

The Onkyo TX-4000 brings tuning accuracy to a new level of precision, with an advanced approach to quartz-synthesized digital tuning. And the amplifier section provides all the dynamic headroom demanded by today's audiophile recording techniques. Onkyo's exclusive Dual-Super-Servo System makes it possible, by allowing the power supply to perform as if it were 50-times larger. And there's more, LED power metering, memory to pre-set 6 AM and 6 FM stations, and elegant styling with a flip-down control panel.

Specifications
Amplifier Power: 45 watts per channel, min. RMS, at 8 ohms both channels driven, from 20 - 20,000 Hz no more than 0,04% T.H.D.
Total Harmonic Distortion:
0,04% at rated power
0,04% at 1 watt output
IM Distortion:
0,1% at rated power
0,004% at 1 watt output
Damping Factor:  40 at 8 ohms
Frequency Response:  20 Hz - 30,000 Hz (±1 dB)
RIAA deviation:  20 Hz - 20,000 Hz (±0,8 dB)
Input Sensitivity/Impedance:
Phono :  2,5 mV / 50 k Ω
Tape Play :  150 mV/50 k Ω
Tape Rec :  150 mV/3,5 k Ω (PH)
Input Sensitivity for 1 watt Output:
Phono :  0,35 mV
Tape Play :  22 mV
Phono Overload:  180 mV RMS at 1 kHz, 0,04% T.H.D.
Signal-to-Noise Ratio:
Phono :  76 dB (IHF A weighted, 1 watt output, 5 mV input); 85 dB ( A weighted, 10 mV input)
Tape :  80 dB (IHF A weighted, 1 watt output, 0,5 V input); 95 dB (A weighted)
Residual Hum and Noise:  0,8 mV at min.volume level (A weighted)
Tone Controls:
Bass :  ±12 dB at 100 Hz
Treble :  ±12 dB at 10 kHz
Filters:
High :  6 kHz, 6 dB/oct
Subsonic :  10 Hz, 12 dB/oct
Loudness (-30 dB):  +9 dB at 40 Hz;  +5 dB at 20 kHz
FM Tuner Section
Tuning Range:  87,9 - 107,9 MHz (200 kHz step)
Usable Sensitivity:
Mono :  11,2 dBf (2,0 µV)
Stereo :  19,2 dBf (5,0 µV)
50 dB Quieting Sensitivity:
Mono :  17,2 dBf (4,0 µV)
Stereo :  37,2 dBf (40 µV)
Capture ratio:  1,5 dB
Image Rejection Ratio:  45 dB
IF Rejection Ratio:  85 dB
Spurious Rejection Ratio:  80 dB
Signal-to-Noise Ratio:
Mono :  70 dB
Stereo :  65 dB
Alternate Channel Attenuation:  60 dB
AM Suppression Ratio:  52 dB
Harmonic Distortion:
Mono :  0,15%
Stereo :  0,25 %
Frequency Response:  30 Hz - 15,000 Hz (±1,5 dB)
Stereo Separation:   40 dB at 1 kHz;  30 dB at 100 Hz - 10,000 Hz
Muting level:  14,7 dBf (3 µV)
Stereo Threshold:  14,7 dBf (3 µV)
AM Tuner Section
Tuning Range:  530 - 1620 kHz (10 kHz step)
Usable Sensitivity:  25 µV
Image rejection Ratio:  45 dB
IF Rejection ratio:  30 dB
Signal-to-Noise Ratio:  40 dB
Harmonic Distortion:  0,8%
General Section
Antennas:
FM :  300 Ω balanced and 75 Ω unbalsnced
AM :  built-in ferrite core  and external terminal
Semiconductors:  3 FETs, 27 Transistors, 20 ICs, 70 Diodes, 31 LEDs
Power Supply:  AC 120 V,  220 -240 V, 50/60 Hz
Dimensions (W x H x D):  480 x 130 x 376 mm (19" x 5-1/8" x 14-3/16")
Weight:  11,4 kg (25,1 lbs)

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