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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





Onkyo TX-7520 receiver

Quartz Synthesized Tuner Low Impedance Drive Discrete Amplifier 

Specifications
Amplifier Section
Power Output:  45 watts per channel, min. RMS, at 8 Ω , both channels driven, from 40 Hz to 20 kHz, with no more than 0,1% T.H.D.
Musical Power Output: 
2 x 130 watts at 4 Ω  , 1 kHz (DIN)
2 x 80 watts at 8 Ω , 1 kHz (DIN)
Continuous Power Output:
2 x 70 watts at 4 Ω , 1 kHz (DIN)
2 x 55 watts at 8 Ω , 1 kHz (DIN)
Total Harmonic Distortion
0,1% at 1 watt output
Intermodulation Distortion:
0,1% at 1 watt output
Damping Factor:  35 at 8 Ω
Frequency Response:  20 - 30,000 Hz ±1 dB
RIAA Deviations:  20 - 20,000 Hz ±0,8 dB
Input Sensitivity / impedance:
Phono :  2,5 mV / 50 k Ω
CD, Tape Play :  150 mV / 50 k Ω
Tape Rec :  150 mV / 3,5 k Ω  (phono)
Phono Overload:  120 mV RMS at 1 kHz, 0,1% T.H.D.
Signal-to-Noise Ratio:
Phono :  85 dB (at 10 mV input, A weighted);  75 dB (IHF A-202)
CD, Tape :  95 dB (A weighted);  80 dB (IHF A-202)
Tone Controls:
Bass : ±10 dB at 100 Hz
Treble :  ±10 dB at 10 kHz
Muting:  -20 dB
Tuner Section
FM
Tuning Range:  87,5 - 108,0 MHz (50 kHz steps)
Usable Sensitivity
Mono :  12,4 dBf, 2,3 µV, IHF;  1,2 µV,  75 Ω  DIN
Stereo :  2,5 µV, 75 Ω
50 dB Quieting Sensitivity
Mono :  2,2 µV, 75 Ω
Stereo :  22 µV, 75 Ω
Capture Ratio:  1,5 dB
Image Rejection Ratio:  85 dB
IF Rejection Ratio:  90 dB
Signal-to-Noise Ratio :
Mono :  70 dB
Stereo :  65 dB
Selectivity:  50 dB DIN (±300 kHz, 40 kHz dev.)
AM Suppression Ratio:  50 dB
Harmonic Distortion
Mono :  0,15%
Stereo :  0,30%
Frequency Response:  30 - 15,000 Hz ± 1,5 dB
Stereo Separation:  40 dB at 1 kHz; 30 dB at 100 - 10,000 Hz
Muting Level:  17,2 dBf, 2 µV, 75 Ω
Stereo Threshold:  17,2 dBf, 2 µV, 75 Ω  
AM
Tuning Range:  522 - 1611 kHz (9 kHz steps)
Usable Sensitivity:  30 µV
Image Rejection Ratio:  40 dB
IF Rejection Ratio:  40 dB
Signal-to-Noise Ratio:  40 dB
Harmonic Distortion:  0,8%
General
Power Requirement:  120 V, 220 V, 240 V;  50/60 Hz
Dimension (W x H x D):  435 x 110 x  317mm (17-1/8" x 4-3/8" x 12-1/2")
Weight:  7,0 kg (15,4 lbs)

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