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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





Audio Research Dual-100


Audio Research Dual-100 Features:
Exclusive New Circuitry (Patented and Patent Pending)
Quality Construction
1/8" anodized aluminum chassis;
Silicon power supply;
Choke filtering;
Heavy duty epoxy-glass circuit board;
Conservative design;
Many precision parts;
Extra quality components;
Thermistor controlled warmup.
Conservative Specifications
Unique Guarantee (Investment protected; 5 years, part and workmanship; 2 years, vacuum tubes/home use; registered warranty transferable)

Ultra Stable Performance: Ideally suited for complex loads such as electrostatic speakers (may be operated into open circuit or any combination of reactive and/or resistive load)
 Unique Circuitry - Delivers superior performance under dynamics of music
 Overload Stability - and lack of crossover distortion provides clean effective loudness of much larger amplifier.

In the evolvement of the Dual 100 design, foremost consideration has been placed on listening quality. Needless to say, there was no place for the "but we've always done it this way" philosophy in its design. Certain well-known principles (but seldom used) are obviously  retained, such as quality of construction, an an adequate power supply. From a circuit standpoint, however, little of it resembles convention.
 One patent has been issued, another is pending, and even beyond thgis, the circuitry is unique. Interestingly enough, it is also very straight-forward and remarkably long-term stable.
 The output stage is one of these unique circuits, and needless to say, it does main fixed regardless of amplitude or complexity of signal.

Specifications:
Frequency Response:
30 Hz to 15 kHz at 1 watt ±1 dB
30 Hz to 15 kHz at 75 watts ±1 dB
Sine Wave Power:  at least 75 watts RMS 30 Hz to 15 kHz
Harmonic Distortion:  less than 0,15% at 1 kHz at 75 watts
Hum and Noise:  at least 80 dB below rated output
Input Sensitivity:  1,0 V RMS for rated output
Impulse Distortion:  essentially none 30 Hz to 15 kHz
Permissible Loads:  Open circuit, resistive, capactive, inductive, or any combination, series or parallel
Output Impedance:  4, 8, 16 ohms
Load Regulation:  from 16 Ω resistive load to open circuit less than 1 dB change 1 kHz
Dimensions  (whd):
Power Supply :  17" x 13" x 10-1/2"
Amplifier :  17" x 13" x 8"
Weight
Power Supply :  88 lbs
Amplifier :  45 lbs
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