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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





Optonica SM-5200 amplifier


Optonica SM-5200 Integrated Stereo Amplifier
The amplifier for the 5200 Series offers the type of circuitry and features usually found in the more sophisticated models. ITL/OTL/OCL (input transformerless/output transformerless/output capacitorless) power amp circuitry helps keep distortion to a minimum, while improving amplifier performance, even with the ample power rating of this unit. The SM-5200 is equipped with a 4-position speaker switch enabling a variety of listening arrangements with two speaker systems, a loudness switch for natural-sounding performance at low volume levels, a subsonic filter for extra audio clarity and mode switch for monaural as well as stereo reproduction. For extra ease, LEDs indicating the operating status of each pushbutton are provided on the front panel.

Specifications
Amplifier Section
Music Output Power: 
2 x 68 W at 4 Ω (0,09% Total Harmonic Distortion)
2 x 45 W at 8 Ω (0,09% Total Harmonic Distortion)
Continuous Output Power (RMS, both channel driven) At 1 kHz :
2 x 40 W (4 Ω, 0,09% T.H.D.)
2 x 33 W (8 Ω, 0,09% T.H.D.)
Continuous Output Power (RMS, both channel driven) from 20 Hz to 20 kHz:
2 x 38 W (4 Ω, 0,15% T.H.D.)
2 x 30 W (8 Ω, 0,09% T.H.D.)
Total Harmonic Distortion:
Rated Power :  0,09%
Half Power :  0,03%
Power Pandwidth (IHF):  10 Hz - 30 kHz (0,15% T.H.D.)
Frequency Response
Phono:  (±0,4 dB) RIAA curve Deviation
Tuner, Aux, Tape :  10 Hz - 65 kHz (+1 dB, -3 dB)
Damping Factor (1 kHz, 4 Ω):  20
Signal-to-Noise Ratio (IHF-A): 
Phono:  70 dB
Aux : 90 dB
Phono Overload Level (1 kHz):  150 mV RMS
Tone Control
Bass :  ±10 dB at 100 Hz
Treble :  ±10 dB at 10 kHz
Loudness Control:  +6 dB at 100 Hz ; +4 dB at 10 kHz
Filter Low :30 Hz (-6 dB/oct)
Input Sensitivity/Impedance:
Phono :  2,3 mV / 47 k Ω; 120 pF
Aux, Tuner, Tape :  150 mV/47 k Ω
Output Level/Impedance
Speakers :  A, B (4 - 16 Ω);  A+B(8 - 16 Ω)
Headphones :  Low Impedance (4 - 16 Ω)
Tape (Chinch) :  150 mV/47 kΩ
Tape (DIN) :  60 mV/ 82 k Ω
General Section
Power Source:  110/220/240 V, 50/60 Hz AC
Power Consumption:  330 W (220V)
Dimensions (W x H x D):  430 x 75 x 382 mm
Weight:  7,7 kg


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