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-105H

Optonica SM-105H
Straight DC Stereo Integrated Amplifier with Fully Electronic Control System

This perfectly "straight" amp is a result of Optonica's efforts to provide a fully digital system based on a lead-less and contact-less design. A combination of fully direct-coupled amplifier circuitry and fully electronic controls for tone, volume and balance completely eliminated the use of lead wires to improve frequency response. Conventional mechanical controls were replaced with electronic circuitry to eliminate contacts. Microcomputer-controlled circuitry splits up the signal to ensure more precise tone control and offer a wider dynamic range, better Signal-to-Noise ratio, lower distortion and greater durability.
A full remote control system, unique graphic displays and an innovative sound memory system were added to match the outstanding performance of this amp.

Amplifier Section
Music Output Power: 
2 x 77 W at 4 Ω (0,01% Total Harmonic Distortion; -22 dB Att)
2 x 60 W at 8 Ω (0,08% Total Harmonic Distortion; -22 dB Att)
Continuous Output Power (RMS, both channel driven) At 1 kHz :
2 x 50 W (4 Ω, 0,01% T.H.D.; -22 dB Att)
2 x 40 W (8 Ω, 0,08% T.H.D.; -22 dB Att)
Continuous Output Power (RMS, both channel driven) from 20 Hz to 20 kHz:
2 x 45 W (4 Ω, 0,05% T.H.D.; -22 dB Att)
2 x 37 W (8 Ω, 0,02% T.H.D.; -22 dB Att)
Total Harmonic Distortion:
Rated Power :  0,01% (-22 dB att)
Half Power :  0,01% (-22 dB att)
Power Pandwidth (IHF):  10 Hz - 35 kHz (0,1% T.H.D.; -22 dB Att)
Frequency Response
Phono:  40 Hz - 20 kHz (±0,3 dB) RIAA curve Deviation
Tuner, Aux, Tape :  7 Hz - 100 kHz (+0 dB, -3 dB)
Damping Factor (1 kHz, 4 Ω):  20
Signal-to-Noise Ratio (IHF-A): 
Phono:  78 dB
Aux : 95 dB
Phono Overload Level (1 kHz):  130 mV RMS
Tone Control
Bass :  ±8 dB at 100 Hz
Treble :  ±8 dB at 10 kHz
Audio Mutting:  ATT -50 dB (fixed)
Input Sensitivity/Impedance:
Phono :  2,3 mV / 47 k Ω; 120 pF
Aux, Tuner, Tape :  140 mV/10 k Ω
Output Level/Impedance
Speakers :  A, B (4 - 16 Ω)
Headphones :  Low Impedance (4 - 16 Ω)
Tape (Chinch) :  150 mV/220 Ω
Tape (DIN) :  45 mV/ 80 k Ω
General Section
Power Source:  110/220/240 V, 50/60 Hz AC
Power Consumption:  400 W (220V)
Dimensions (W x H x D):  430 x 95 x 320 mm
Weight:  7,8 kg

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