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 D-110

The D-110 is a linear 2-channel power amplifier of extremely high quality construction designed for the reproduction of speech and music. It represents "second Generation" advancement of Audio Research's analog module technology.
With the D-350 and D-100A technology to draw from, the D-110 was conceived to embody those parts of each design that could be brought together to provide an amplifier having the very highest possible performance level within its power capability.

Assuming a basically linear and stable amplifier design with adequate "slewing rate" to allow possible audio waveforms to be reproduced with low distortion, there are still two most important factors that must be dealt with if it is to be capable of driving loudspeaker loads "fast and clean". One is the "stiffness" or "muscle" of the output-driver stage; the other, a stable high capacity power  supply, capable of providing the instentaneous current demands of the circuit. By utilizing the D-350 power supply, with its 300 joule energy storage, and the D-100A output stage rebiased to a much higher "idle" current (the 3 built-in, superquiet fans keep the ambient temperature to a very reasonable level), an amplifier has been created that provides a new level of music reproduction. To obtain the performance this amplifier is capable of, it is recommended that only commensurate quality preamplifier-control units (such as the SP-3B, SP-5, SP-6) be used with it. Also, only high quality turntables with stable arms and cartridges should be used.

All solid state featuring Audio Research's analog module technology and unique linear output circuitry.
Power-line monitor meter with operating ranges identified.
Output power monitor meters - peak "averaging" circuitry to monitor safe operating (sine wave power calibration 100 watts/8 ohms top of green arc).
Built-in speaker line fuse holders - user can assure absolute speaker protection.
Front panel power supply fuses for easy acces
Super-quiet built-in fans to assure reliable operation
Front and rear panels are 2-color anodized aluminum for permanent finish and lettering
Industrial grade components and construction for long service life. Rated for continuous commercial service.

Power Output:  100 watts per channel minimum RMS (both channels operating) at 8 ohms from 1 Hz to 20 kHz with less than ,25% T.H.D.
Intermodulation Distortion:  less than 0,05% at rated output (80 Vp-p) and load (SMPTE method)
Total Harmonic Distortion and Intermodulation Distortion both decrease with decreasing output (typically less than 0,02% at 1 watt per channel RMS)
Power increases to maximum at 4 ohms
Input Sensitivty:  1,5 volts RMS for rated power and load
Input Impedance:  30 k Ω (nominal)
Damping Factor:  more than 200 at rated power and load (20 Hz to 20 kHz)
Noise:  wide band, unweighted, more than 100 dB below 100 watts at 8 Ω - power line components (hum) 90 dB below 100 watts at 8 Ω
Power Requirements:  105 - 125 / 210 - 240 V AC, 50/60 Hz
Power Consumption:  600 watts maximum
Dimensions (W x H x D):  480 x 265 x 436 mm (19" x 10-1/2' x 17-1/4")
Handles Extend:  41 mm (1-5/8 ") forward of the front panel
Weight:  42 kg (92 lbs) Net 

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