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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





Pioneer SA-740

 Stereo Integrated Amplifier (1983)
Specifications
Amplifier Section
Continuous Power Output:  40 watts per channel (at 8 Ω from 20 - 20,000 Hz with no more than 0,05% THD)
DIN Continuous Power Output:  54 watts per channel (at 8 Ω, 1 kHz, 1% THD)
Total Harmonic Distortion (20 - 20,000 Hz, 8 Ω)
Contiuous rated Power Output:  no more than 0,05%,
40 watts per Channel Power Output:  no more than 0,05%
Damping Factor (1 kHz, 8 Ω):  60
Imput Sensitivity/Impedance:
Phono:  2,5 mV/ 50 k Ω
Tuner, CD/Aux, Tape Play, Adaptor In:  150 mV/50 k Ω
Phono Overload Level (THD 0,1%, 1 kHz):  150 mV
Output Level:
Tape Rec, Adaptor Out:  150 mV
Speaker:  6 - 18 Ω
Frequency Response:
Phono (RIAA Equalization):  20 Hz to 20,000 Hz ±0,5 dB
Tuner, CD/Aux, Tape Play, Adaptor:  10 Hz to 70,000 Hz +1 dB, -3 dB
Tone Control:
Bass: ±10 dB at 100 Hz
Treble :  ±10 dB at 10 kHz
Loudness Contour (Volume control set at -40 dB position):  +6 dB (100 Hz ), +3 dB (10 kHz)
Hum and Noise (IHF, short circuited A network)
Phono :  72 dB
Tuner, CD/Aux, Tape Play, Adaptor IN :  102 db
Hum and Noise (DIN, continuous rated power output/50 mW)
Phono :  69 dB/ 62 dB
Tuner, CD/Aux, Tape Play, Adaptor In:  88 dB / 62 dB
Miscellaneous
Power Requirements:  AC 120 V, 220 - 240 V 50/60 Hz
Power Consumption:  90 - 110 watts
Dimensions (W x H x D):  420 x 98 x 287 mm (16-9/16" x 3-7/8" x 11-5/16")
Weight:  5,4 kg (14 lb 5 oz)
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