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





McIntosh MAC 4100

 AUTOMATIC POWER TURN ON/TURN OFF
Power to the entire stereo system can be controlled from either the front panel power switch or the turntable's power switch. A current sensing relay connected to the turntable AC power outlets is controlled by the turntable power switch. The relay, in turn controls the AC power to the remainder of the system. Sensitivity of the circuit is adjustable to match the current consumption of your turntable.
POWER GUARD INDICATOR AND PROTECTION CIRCUIT
Loudspeakers are protected from burnout by the Power Guard circuit and also by other circuits that instantaneously disconnect the speakers in the event of the presence of DC on the output.
Two power guard indicators indicate when the power amplifier has reached full output. At this point the power guard circuit begins to control amplification dynamically so that you will not hear the harsh distorted sound of square wave clipping. In addition your speakers are protected from burnout.
 HIGH ACCURACY TRACKING VOLUME CONTROL
The volume control, is a step attenuator which has tracking accuracy within 1 dB throughout its entire range. Such extremely accurate matching is achieved through electronically controlled trimming of the resistance material deposited on pairs of printed circuits. Tracking accuracy and quiet performance are permanently maintained. Use does not affect performance as in ordinary volume controls.
TURN-ON TRANSIENT ELIMINATION CIRCUITS
Speaker outputs are connected only after power supplies and circuits have stabilized eliminating turn on thumps or clicks.
 FIVE BAND TONE SHAPING CONTROLS IN EITHER THE RECORD OR LISTEN CIRCUITS
Five separate controls permit individual musical spectra shaping to satisfy personal preference or program limitations. There is 12 dB plus or minus control at center frequencies of 30, 150, 1.500 and 10,000 Hz. In the center (detent) position the tone shaping circuits are not active.
ACTIVE LOUDNESS CONTROL
Loudness controls typically are simple, passive circuits connected to a portion of the rotation range of the volume control. As a consequence,  loudness compensation accuracy is dependent on many variables such as speaker efficiency, amplifier gain and differences in input level. The loudness control is continuously variable, operates independently of the volume control, and its contour is accurately modeled after the Fletcher Munson family of "Equal Loudness" curves.
 SPEAKER SWITCHES FOR THREE SETS OF SPEAKERS
Three sets of loudspeakers may be used one at a time, two together, or all three simultaneously.
DUAL TAPE MONITOR AND TAPE COPY SWITCHES
Two tape recorders can record simultaneously from the program being listened to or you may record from one to the other without interfering with the "Listen" program.
SPECIFICATIONS

POWER OUTPUT:
100 watts minimum sine wave continuous average power output, per channel, both channels operating into 4 ohms 20 Hz to 20 kHz, with no more than 0.05% THD
75 watts minimum sine wave continuous average power output, per channel, both channels operating into 8 ohms 20 Hz to 20 kHz, with no more than 0.05% THD.
OUTPUT LOAD IMPEDANCE:  4 ohms, 8 ohms
RATED POWER BAND:  20 Hz to 20 kHz
TOTAL HARMONIC DISTORTION:  0.05% maximum at any power level from 250 milliwatts to rated power per channel, 20 Hz to 20,000 Hz, both channels operating
FREQUENCY RESPONSE:  20 Hz to 20 kHz  + 0, -0.5 dB at rated power
INTERMODULATION DISTORTION:  0.05% maximum at any power level from 250 milliwatts to rated power per channel both channels operating for any combination of frequencies 20 Hz to20,000 Hz
NOISE AND HUM:
Power Amplifier :  100 dB IHFA, 95 dB unweighted, below rated output.
Tape and Aux Input :  95 dB IHFA, 90 dB unweighted below rated output.
Phono Input :  90 dB IHFA, 80 dB unweighted, below 10 mV input
DAMPING FACTOR:  Greater than 30
INPUT SENSITIVITY AND IMPEDANCE:
Power Amplifier :   2.5 volts,  22,000 ohms;
Tape, Auxiliary :  250 millivolts,  100,000 ohms;
Phono: 2 millivolts,  47,000 ohms, 87 pF
TAPE OUTPUT LEVEL:
Tuner : 1.0 volts at 100% modulation [FM];
Tape :  250 millivolts with rated input;
Phono : 250 millivolts with rated input
PROGRAM EQUALIZER:  ±12 dB at 30, 150, 500, 1500, and 10,000 Hz
FM SECTION
SENSITIVITY:  2mV [11.2dBF] IHF minimum
SIGNAL TO NOISE RATIO:  70dB IHF minimum
HARMONIC DISTORTION:  Mono: 0.18% IHF (maximum);  Stereo: 0.38% IHF (maximum)
FREQUENCY RESPONSE:  20 Hz to 15 kHz,   +0, -1 dB
CAPTURE RATIO:  1.8 dB
SELECTIVITY:  75 dB IHF minimum
SPURIOUS REJECTION:  90 dB IHF minimum
IMAGE REJECTION:  80 dB IHF minimum
STEREO SEPARATION:  45 dB minimum at 1 kHz
SCA REJECTION:  60 dB minimum
AM SECTION
SENSITIVITY:  75 mV IHF [External antenna]
SIGNAL TO NOISE RATIO:  45 dB minimum IHF, 55 dB at 100% modulation
HARMONIC DISTORTION:  0.8% maximum at 30% modulation
FREQUENCY RESPONSE:  6 dB down at 3500 Hz
ADJACENT CHANNEL SELECTIVITY:  30 dB minimum IHF
IMAGE REJECTION:  65 dB minimum, 540 kHz to 1600 kHz
GENERAL INFORMATION
SEMICONDUCTOR COMPLEMENT:
45 Transistors,  31 Integrated Circuits,  62 Diodes,  1 Silicon Controlled Rectifier
POWER REQUIREMENTS:  120 Volts, 50/60 Hz, 0.6 to 4 amperes (72 to 480 watts)
MECHANICAL INFORMATION
DIMENSIONS (W x H x D):
IN CABINET: 473 x 165 x 394 mm  (18-5/8 x 6-1/2 x 15-1/2 inches)
WITHOUT CABINET:
Front panel measures  446 x 133 mm (17-9/16 x 5-1/4 inches)
Chassis measures  435 x 125 x 343 mm (17-1/8 x 4-15/16 x 13-1/2 inches)
Knob and handle clearance required is 32 mm  (1-1/4 inches) in front of the mounting surface.
FINISH:
Front panel is clear anodized to produce a brushed satin/silver finish with black trim.
Cabinet is walnut grained vinyl
WEIGHT:  19 kg (42 pounds) net, 25,4 kg (56 pounds) in shipping carton

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