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