McIntosh Stereo Amplifier MC1201 User Manual

Owner’s  
Manual  
MC1201 Power Amplifier  
MC1201  
McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 FAX: 607-724-0549  
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Thank You  
A polarized plug has two blades with one wider  
than the other. A grounding type plug has two  
blades and a third grounding prong. The wide  
blade or the third prong are provided for your  
safety. If the provided plug does not fit into your  
outlet, consult an electrician for replacement of the  
obsolete outlet.  
Your decision to own this McIntosh MC1201 Power Am-  
plifier ranks you at the very top among discriminating mu-  
sic listeners. You now have “The Best.” The McIntosh  
dedication to “Quality,” is assurance that you will receive  
many years of musical enjoyment from this unit.  
Please take a short time to read the information in this  
manual. We want you to be as familiar as possible with all  
the features and functions of your new McIntosh.  
18. Do not overload wall outlets, extension cords or inte-  
gral convenience receptacles as this can result in a risk  
of fire or electric shock.  
19. To completely disconnect this equipment from the AC  
Mains, disconnect the power supply cord plug from the  
AC receptacle.  
Please Take A Moment  
The serial number, purchase date and McIntosh dealer  
name are important to you for possible insurance claim or  
future service. The spaces below have been provided for  
you to record that information:  
Care of Equipment:  
Serial Number:  
Purchase Date:  
Dealer Name:  
20. Clean only with a dry cloth.  
21. Do not permit objects or liquids of any kind to be  
pushed, spilled and/or fall into the equipment through  
enclosure openings.  
22. Unplug the power cord from the AC power outlet  
when left unused for a long period of time.  
Technical Assistance  
If at any time you have questions about your McIntosh  
product, contact your McIntosh dealer who is familiar with  
your McIntosh equipment and any other brands that may  
be part of your system. If you or your dealer wish addi-  
tional help concerning a suspected problem, you can re-  
ceive technical assistance for all McIntosh products at:  
Repair of Equipment:  
23. Refer all servicing to qualified service personnel. Ser-  
vicing is required when the equipment has been dam-  
aged in any way, such as power-supply cord or plug is  
damaged, liquid has been spilled or objects have fallen  
into the equipment, the equipment has been exposed to  
rain or moisture, does not operate normally, or has  
been dropped.  
24. Do not attempt to service beyond that described in the  
operating instructions. All other service should be re-  
ferred to qualified service personnel.  
25. When replacement parts are required, be sure the ser-  
vice technician has used replacement parts specified by  
McIntosh or have the same characteristics as the origi-  
nal part. Unauthorized substitutions may result in fire,  
electric shock, or other hazards.  
26. Upon completion of any service or repairs to this prod-  
uct, ask the service technician to perform safety checks  
to determine that the product is in proper operating  
condition.  
McIntosh Laboratory, Inc.  
2 Chambers Street  
Binghamton, New York 13903  
Phone: 607-723-1545  
Fax: 607-723-3636  
Customer Service  
If it is determined that your McIntosh product is in need of  
repair, you can return it to your dealer. You can also return  
it to the McIntosh Laboratory Service Department. For as-  
sistance on factory repair return procedure, contact the  
McIntosh Service Department at:  
McIntosh Laboratory, Inc.  
2 Chambers Street  
Binghamton, New York 13903  
Phone: 607-723-3515  
Fax: 607-723-1917  
Copyright 2000 ã by McIntosh Laboratory, Inc.  
3
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Table of Contents  
Introduction  
Now you can take advantage of traditional McIntosh stan-  
dards of excellence in the MC1201 Power Amplifier. The  
1,200 watt high current output will drive any high quality  
loudspeaker system to its ultimate performance. The  
MC1201 reproduction is sonically transparent and abso-  
lutely accurate. The McIntosh Sound is “The Sound of the  
Music Itself.”  
Safety Instructions ............................................................ 2  
Thank You and Please Take a Moment............................. 3  
Technical Assistance and Customer Service .................... 3  
Table of Contents and General Notes ............................... 4  
Introduction ...................................................................... 4  
Performance Features ....................................................... 4  
Dimensions ....................................................................... 5  
Installation ........................................................................ 6  
Rear Panel Connections and Switch ................................. 7  
How to Connect ................................................................ 8  
Front Panel Displays and Controls ................................. 10  
How to Operate............................................................... 11  
Technical Description ..................................................... 12  
Notes ............................................................................... 16  
Specifications ................................................................. 18  
Packing Instruction ......................................................... 19  
Performance Features  
· Power Output  
The MC1201 is a Power Amplifier with a capability of  
1,200 watts into 2, 4 or 8 ohm speakers with less than  
0.005% distortion.  
· Full Balanced Circuity  
The MC1201 is fully balanced from inputs to outputs. It  
consists of two matched power amplifiers operating in  
push-pull with their outputs combined in a McIntosh  
Autoformer. The double balanced configuration cancels  
virtually all distortion.  
General Notes  
Caution: The MC1201 Amplifier weight is 147 pounds  
(66.7 kilograms). It requires two or more persons  
to safely handle when moving the amplifier.  
1. The following Connecting Cable is available from the  
McIntosh Parts Department:  
Power Control Cable Part No. 170-202  
Six foot, 2 conductor shielded, with two 1/8 inch stereo  
mini phone plugs.  
· Power Guard  
The patented McIntosh Power Guard circuit that prevents  
the amplifier from being overdriven into clipping, with its  
harsh distorted sound that can also damage your valuable  
loudspeakers.  
2. For additional connection information, refer to the owners  
manual(s) for any component(s) connected to the MC1201.  
3. The MC1201 mutes the speaker output for approximately two  
seconds when first turned on.  
4. It is very important that loudspeaker cables of adequate size  
be used, so that there will be no power loss. The size is  
specified in Gauge Numbers or AWG, (American Wire Gauge).  
The smaller the Gauge number, the larger the wire size:  
If your loudspeaker cables are 50 feet (38.1m) or less,  
use at least 14 Gauge.  
· Sentry Monitor and Thermal Protection  
McIntosh Sentry Monitor power output stage protection  
circuits ensure the MC1201 will have a long and trouble  
free operating life. Built-in Thermal Protection Circuits  
guard against overheating.  
If your loudspeaker cables are 100 feet (76.2m) or less,  
use at least 12 Gauge.  
5. Pin configuration for the XLR Balanced Input connectors on  
the MC1201: PIN 1: Shield or ground  
· Patented Autoformer  
McIntosh designed and manufactured Output Autoformers  
provide an ideal match between the amplifier output stages  
and speaker loads of 2, 4 and 8 ohms. The Autoformers  
also provide perfect DC protection for your valuable loud-  
speakers.  
PIN 2: + input  
PIN 3: - input  
6. In the event that the MC1201 over heats, due to improper  
ventilation and/or high ambient temperature, the protection  
circuits will activate. The Front Panel Power Guard LED will  
continuously indicate ON and the audio will be muted. When  
the MC1201 has returned to a safe operating temperature,  
normal operation will resume.  
· Illuminated Power Meter  
The Illuminated Power Output Watt Meter on the MC1201  
is peak responding, and indicates the true power output of  
the amplifier. The Peak Watt Hold Mode allows the meter  
to temporarily stay at the highest power output and then  
slowly decay.  
7. The MC1201 incorporates the very latest in Fully Double  
Balanced Circuitry. As a result, the Loudspeaker  
Negative  
Connections are above chassis ground. Do not combine any  
connections together, ground them or connect with another  
MC1201.  
4
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Introduction, Performance Features and Dimensions  
The following dimensions can assist in determining the  
best location for your MC1201. There is additional infor-  
mation on the next page pertaining to installing the  
MC1201 into cabinets.  
5
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Installation  
Installation  
Caution: The MC1201 Amplifier weight is 147 pounds  
(5.08 cm) in front of the mounting panel for handle clear-  
ance. Be sure to cut out a ventilation hole in the mounting  
shelf according to the dimensions in the drawing.  
(66.7 kilograms). It requires two or more persons  
to safely handle when moving the amplifier.  
The MC1201 can be placed upright on a table or shelf,  
standing on its four feet. The  
four feet may be removed from  
the bottom of the MC1201  
when it is custom installed as  
outlined below. The four feet  
together with the mounting  
screws should be retained for  
possible future use if the  
MC1201 is removed from the  
custom installation and used  
free standing. It also can be  
custom installed in a piece of  
furniture or cabinet of your  
choice. The required panel cut-  
out, ventilation cutout and unit  
dimensions are shown.  
Always provide adequate  
ventilation for your MC1201.  
Cool operation ensures the  
longest possible operating life  
for any electronic instrument.  
Do not install the MC1201 di-  
rectly above a heat generating  
component such as a high pow-  
ered amplifier. If all the com-  
ponents are installed in a single  
cabinet, a quiet running venti-  
lation fan can be a definite as-  
set in maintaining all the sys-  
tem components at the coolest  
possible operating temperature.  
A custom cabinet installa-  
tion should provide the follow-  
ing minimum spacing dimen-  
sions for cool operation. Allow  
at least 6 inches (15.24 cm)  
above the top, 2 inches  
(3.81cm) below the bottom and  
1 inch (2.54 cm) on each side  
of the amplifier, so that airflow  
is not obstructed. Allow 22  
inches (55.88 cm) depth behind  
the front panel. Allow 2 inches  
6
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Rear Panel Connections and Switch  
BALANCED INPUT for an au-  
dio cable from a preamplifier or  
control center audio output  
POWER CONTROL IN receives turn On/  
Off signals from a McIntosh component and  
the POWER CONTROL OUT sends a turn  
On/Off signal to the next McIntosh compo-  
nent  
UNBALANCED INPUT  
for an audio cable from a  
preamplifier or control cen-  
ter audio output  
INPUT MODE  
switch selects  
balanced or  
unbalanced  
input  
CIRCUIT BREAKER  
Press to reset if the am-  
plifier will not power  
up  
Connect the  
MC1201 power  
cord to a live AC  
outlet. Refer to in-  
formation on the  
back panel to deter-  
mine the correct  
voltage  
OUTPUT Connections  
for 2 ohm loudspeaker  
OUTPUT Connections  
for 8 ohm loudspeaker  
OUTPUT Connections  
for 4 ohm loudspeaker  
Caution: The Loudspeaker  
Negative Connections are above chassis  
ground. Do not combine any connections together, ground  
them or connect with another MC1201.  
7
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How to Connect the MC1201  
Banana plug connection:  
Caution: The supplied AC Power Cord should not be  
connected to the Rear Panel of the MC1201  
Amplifier until after the Loudspeaker Connections  
have been made and the supplied protective  
Terminal Connections Cover has been installed.  
Failure to observe this could result in Electric  
Shock.  
Insert the banana plug into the hole at the top of the  
terminal. Tighten the top portion of the terminal post  
and the set screw to secure the banana plug in place.  
Note: The use of Banana Plugs is for use in the United  
States and Canada only.  
4. Connect the loudspeaker hookup cable to the output  
terminals that match the impedance of your loudspeak-  
er, being careful to observe the correct polarities. Out-  
put impedance connections of 2 ohms, 4 ohms and 8  
ohms are provided. If the impedance of your loud-  
speaker is in-between the available connections, use  
the nearest lower impedance connection.  
WARNING: Loudspeaker terminals are hazardous live  
and present a risk of electric shock. For  
1. For Remote Power Control, connect a power control  
cable from the Control Center or Preamplifier Power  
Control Out to the MC1201 Power Control In.  
2. Connect a cable from the Balanced Output of a McIn-  
tosh Preamplifier or Control Center to the MC1201  
Balanced Input.  
Note: An optional hookup is to use an unbalanced cable.  
3. Prepare the Loudspeaker Hookup Cable that attach to  
the MC1201 Power Amplifier by choosing one of the  
methods below:  
additional instruction on making  
Loudspeaker Connections contact your  
Bare wire cable ends:  
McIntosh Dealer or McIntosh Technical  
Support.  
Carefully remove sufficient insulation from the cable  
ends, refer to figures 1,  
2 & 3. If the cable is  
stranded, carefully twist  
the strands together as  
5. Attach the supplied Terminal Connections Cover with  
the four Philip Head Mounting Screws (10-32 x 1/2  
inch) to the Rear Panel of the MC1201 Amplifier. Re-  
fer to figure 7.  
Note: There are six openings on the bottom edge of the  
cover to allow for the Loudspeakers Cable to exit  
the MC1201. The Rear Chassis Handle (“U”  
shaped) has tapped screw openings on both sides  
for securing the cover to the MC1201.  
tightly as possible.  
Note: If desired, the twisted ends can be tinned with  
solder to keep the strands together, or attach spade  
lug and/or banana connector.  
Spade lug or prepared wire connection:  
Insert the spade lug  
6. Connect the MC1201 power cord to an active AC out-  
let.  
connector or pre-  
pared section of the  
cable end into the  
terminal side access  
hole, and tighten the terminal  
cap until the cable is firmly  
clamped into the terminal so  
the wires cannot slip out. Re-  
Terminal  
fer to figures 4, 5 & 6.  
Connections  
Cover  
Rear  
Chassis  
Handle  
Cover  
Cover  
Mounting  
Screw  
Mounting  
Screw  
Locations  
Locations  
Cable Openings  
Figure 7  
8
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How to Connect the MC1201  
McIntosh C200C Controller  
McIntosh C200P Preamplifier  
To AC Outlet  
4 ohm  
Loudspeaker  
Caution: The Loudspeaker  
Negative Connections are above chassis  
ground. Do not combine any connections together, ground  
them or connect with another MC1201.  
9
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Front Panel Displays and Controls  
METER indicates  
the Power Output  
of the amplifier  
POWER GUARD LED  
lights when the amplifier  
POWER GUARD circuit  
activates  
Remote On  
Indicator lights  
when the am-  
plifier is in the  
Remote Turn-  
On Mode  
METER Switch selects  
the display modes of the  
Power Output Meter  
POWER Switch Turns  
AC power On/Off, or  
On/Remote  
10  
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How to Operate the MC1201  
How to Operate the MC1201  
Power On  
power level. The decay rate is approximately  
6dB per minute.  
Note: The MC1201 Power Output Meter  
indicates the actual wattage delivered to  
the loudspeakers by responding to the  
combination of current and voltage  
output.  
To have the MC1201 automatically turn On or Off when a  
control center turns on or off,  
rotate the power switch to the  
remote position. For manual op-  
eration, rotate the power switch  
to the On or Off position as de-  
sired. Refer to figure 8.  
Input Mode Switch  
Note: There must be a power  
The Input Mode Switch, which is located on the Rear  
Panel of the MC1201, allows  
you to select either the Bal-  
anced or Unbalanced Input. Re-  
fer to figure 11.  
control connection  
between the MC1201 and  
the McIntosh Control  
Center, in order for the remote power turn-on to  
function.  
Figure 8  
Meter Selection  
Rotate the meter mode switch to select the meter operation  
mode you desire. Refer to figures 9 and 10.  
Lights Off - Meter lights are  
turned off and the  
meter will con-  
tinue to indicate  
Figure 11  
the power output.  
Watts- The meters re-  
spond to all the  
musical informa-  
tion being pro-  
duced by the am-  
Figure 9  
plifier. They indicate to an accuracy of at least  
95% of the power output with only a single  
cycle of a 2000Hz tone burst.  
Hold - The meter pointer is locked to the highest  
power peak in a sequence of peaks. It is elec-  
tronically held to this power level until a  
higher power peak passes through the ampli-  
Figure 10  
fier. The meter pointer will then rise to the  
newer higher indication. If no further power  
peaks are reached, the meter pointer will very  
slowly return to its rest position or lower  
11  
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Technical Description  
McIntosh Laboratory, the company who introduced the  
world’s first amplifier that could be called “High Fidelity”,  
has done it again. The McIntosh engineering staff has cre-  
20Hz to 20,000Hz. Typical performance at mid frequencies  
is less than 0.002%. The true distortion readings on the  
MC1201 are so low, it takes special measuring techniques  
ated a power amplifier without compromise, using the most to make accurate readings. The MC1201 can deliver the  
advanced McIntosh circuit design concepts.  
best possible performance from any type of high quality  
loudspeaker system.  
A continuous average power output rating of 1,200  
watts and with an output current of greater than 200 am-  
peres, makes this not only the most advanced, but also the  
most powerful amplifier McIntosh has ever manufactured.  
The distortion limits for the MC1201 are no more than  
0.005% at rated power output for all frequencies from  
Creating an amplifier with this level of performance did  
not come easily. Many months of design, testing and mea-  
suring were required. Extensive controlled listening tests,  
the ultimate form of measuring, were made before the final  
design was accepted.  
Top View of the MC1201  
12  
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Technical Description  
Design Philosophy  
The output signals of the two balanced circuits are  
coupled together in the unique McIntosh MC1201 Output  
Autoformer. It provides low distortion power transfer at  
frequencies from below 20Hz to well beyond 20,000Hz  
with optimum impedance points of two ohms, four ohms  
and eight ohms. The unequaled expertise of McIntosh in  
the design and manufacturing of autoformers is legendary  
in the high fidelity industry.  
The design philosophy incorporated in the MC1201 in-  
volved several different techniques, all based on sound sci-  
entific logic. Every stage of voltage or current amplifica-  
tion must be as linear as possible prior to the use of nega-  
tive feedback. McIntosh engineers know how to properly  
design negative feedback circuits so they contribute to the  
extremely low distortion performance expected from a  
McIntosh amplifier. The typical McIntosh owner would  
never accept the approximately 100 times higher distortion  
of many non-feedback designs.  
The high efficiency circuit design of the MC1201 con-  
tributes to low operating temperatures. More than 290  
square inches of heat sink area keep the MC1201 operating  
Double Balanced Push-Pull design is used from input to safely with convection cooling. No fans are needed.  
output. Each half of the amplifier contains complimentary  
balanced circuitry. The resulting double balanced configu-  
ration cancels even order distortion. Refer to figure 12.  
All transistors are selected to have nearly constant cur-  
rent gain over the entire current range they must cover.  
Output transistors in particular, have matched uniform cur-  
rent gain, high current bandwidth product and large active  
region safe operating area. An automatic tracking bias sys-  
tem completely eliminates any trace of crossover distor-  
tion. Precision metal film resistors and low dielectric ab-  
sorption film capacitors are used in all critical circuit loca-  
tions.  
Autoformers  
All solid state power amplifier output circuits work best  
into what is called an optimum load. This optimum load  
may vary considerably from what a loudspeaker requires.  
In the case of more than one loudspeaker connected in par-  
allel, the load to the power amplifier may drop to two ohms  
or even less. A power amplifier connected to a load that is  
lower than optimum, causes more output current to flow,  
which results in extra heat being generated in the power  
output stage. This increase in temperature will result in a  
reduced life expectancy for the amplifier.  
Block Diagram  
of the  
Amplifier and Meter Circuitry  
Figure 12  
13  
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The special Balanced Dual Core Autoformer creates an  
ideal match between the power amplifier output stage and  
the loudspeaker. A McIntosh amplifier with an Autoformer  
can be used to safely drive multiple speakers without re-  
ducing the life expectancy of the power amplifier. Refer to  
figure 13.  
Power Output Meter  
The McIntosh MC1201 has a huge hand built Output Watt  
Meter that responds 95% full scale to a single cycle tone  
burst at 2kHz. Refer to figure 14. Voltage and current out-  
put are electronically measured, multiplied and fed to a  
special circuit that accelerates the pointer movement in the  
upward direction. When the pointer reaches its peak it  
pauses only long enough for the human eye to perceive its  
position, then drops. It is almost 10 times faster than a pro-  
fessional VU meter.  
A front panel switch is provided to change the meter to  
the Watts Hold Mode of operation. This allows fast upward  
movement of the pointer but greatly increases Hold Time at  
the peak of its travel. The highest power output of the  
source material is thus recorded.  
Protection Circuits  
The MC1201 incorporates a version of the McIntosh Sen-  
try Monitor Output Transistor Protection Circuit. Refer to  
Figure 15. There is absolutely no compromise in sonic per-  
formance with this  
circuit, and it en-  
sures safe opera-  
tion of the ampli-  
Figure 13  
There is absolutely no performance limitation with an  
fier under even the  
Autoformer. Its frequency response exceeds that of the out- most extreme oper-  
put circuit itself, and extends well beyond the audible ating conditions.  
range. Its distortion level is so low it is virtually impossible The different types  
to measure. of protection cir-  
In the rare event of a power amplifier output circuit fail- cuits incorporated  
ure, the McIntosh Autoformer provides absolute protection  
from possible damage to your valuable loudspeakers. The  
unequaled expertise of McIntosh in the design and manu-  
facturing of Autoformers is legendary in the high fidelity  
industry. McIntosh engineers know how to do it right.  
in the MC1201 in-  
sure a long and  
safe operating life.  
This is just one of  
the many characteristics of McIntosh Power Amplifiers  
that make them world famous.  
Figure 15  
The MC1201 also includes the unique patented McIn-  
tosh Power Guard circuit.  
Input Test Signal  
Power Guard eliminates  
the possibility of ever  
overdriving the amplifier  
into clipping. Refer to  
figures 16, 17 and 18. An  
overdriven amplifier can  
produce both audible and  
inaudible distortion levels  
exceeding 40%. The au-  
dible distortion is un-  
pleasant to hear, but the  
inaudible ultrasonic dis-  
tortion is also undesir-  
Figure 14  
Figure 16  
14  
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Technical Description, con’t  
Without Power Guard  
able, since it can damage  
valuable loudspeaker sys-  
tem tweeters. You will  
never experience the  
ally produce distortion free output well above its rated  
power due to the McIntosh philosophy of conservative de-  
sign.  
harsh and damaging dis-  
tortion due to clipping.  
The Power Guard cir-  
cuit is a waveform com-  
parator, monitoring both  
the input and output  
waveforms. Under nor-  
mal operating conditions,  
there are no differences  
between the shape of  
Power Supply Circuits  
To compliment the fully balanced design of the MC1201  
there are two high voltage power supplies; one for each of  
the two amplifier circuits, allowing each amplifier circuit  
to be optimized using its own power supply. Refer to figure  
19. High power amplifiers draw high current from the AC  
power line. Therefore, it is important that they plug directly  
into the wall outlet.  
Also, most owners desire that there be one power  
switch for the whole audio system. The MC1201 is  
equipped with a circuit that provides remote Power Control  
from your McIntosh Preamplifier or Control Center. When  
you turn on your preamplifier a digital “1” (+5V) signal  
operates the power relay in the MC1201. The MC1201 also  
has a remote Power Control Out Jack. The Power Control  
signal from this jack is delayed by a fraction of a second so  
that the turn on power surge of the next power amplifier  
occurs at a later time. This helps prevent power circuit  
overload that could trip circuit breakers or blow fuses, a  
very important feature in a high power Home Theater Sys-  
tem employing three MC1201 Power Amplifiers.  
The MC1201 can provide greater than 200 amperes  
peak output current to drive uneven speaker loads. Some  
poor speaker designs have input impedance that dip to 1 or  
2 ohms at various frequencies and the MC1201 has the out-  
put current reserve to drive them. It can deliver over 1,000  
Watts Output on tone bursts. The MC1201 has huge main  
filter capacitors that guarantee an excellent signal to noise  
ratio and the energy storage necessary for the wide dy-  
namic range that “Digital Audio” demands.  
Figure 17  
these waveforms. If an amplifier channel is overdriven,  
there will be a difference between the two signal wave-  
forms. When the difference exceeds 0.3% (equivalent to  
0.3% harmonic distor-  
With Power Guard  
tion), the Power Guard  
activates the PG light and  
a dynamic electronic at-  
tenuator at the amplifier  
input reduces the input  
volume just enough to  
prevent any further in-  
crease in distortion. The  
Power Guard circuit acts  
so fast that there are ab-  
solutely no audible side  
effects and the sonic pu-  
rity of the music repro-  
Figure 18  
duction is perfectly pre-  
served. The MC1201 Power Amplifier with Power Guard  
is not limited to just the rated power output, but will actu-  
Block Diagram  
of the  
Power Supply  
Figure 19  
15  
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16  
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Notes  
17  
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Specifications  
Specifications  
Power Output  
Power Requirements  
Minimum sine wave continuous average power output is:  
1,200 watts into 2 ohm load  
1,200 watts into 4 ohm load  
100 Volts, 50/60Hz at 18 amps  
110 Volts, 50/60Hz at 16.5 amps  
120 Volts, 50/60Hz at 15 amps  
220 Volts, 50/60Hz at 8.2 amps  
230 Volts, 50/60Hz at 7.8 amps  
240 Volts, 50/60Hz at 7.5 amps  
1,200 watts into 8 ohm load  
Rated Power Band  
20Hz to 20,000Hz  
Note: Refer to the rear panel of the MC1201 for the correct  
voltage.  
Total Harmonic Distortion  
Maximum Total Harmonic Distortion at any power  
level from 250 milliwatts to rated power output is:  
0.005% for 2, 4 or 8 ohm loads  
Dimensions  
Front Panel: 17-3/4 inches (46cm) wide, 11 inches (28cm)  
high. Depth behind front mounting panel is 19-5/8 inches  
(49.83cm). Clearance required in front of the Front Panel is  
1-3/4 inches (4.5cm) for handles.  
Dynamic Headroom  
2.1dB  
Weight  
Frequency Response  
147 pounds (66.7 kg) net, 172 pounds (78.0 kg) in shipping  
carton  
+0, -0.25dB from 20Hz to 20,000Hz  
+0, -3dB from 10Hz to 100,000Hz  
Sensitivity  
2.45 Volts Balanced Input  
4.9 Volts Unbalanced Input  
A-Weighted Signal To Noise Ratio  
93dB Unbalanced (120dB below rated output)  
97dB Balanced (124dB below rated output)  
Intermodulation Distortion  
Maximum Intermodulation Distortion if instanta-  
neous peak output does not exceed twice the rated  
output, for any combination of frequencies from  
20Hz to 20,000Hz is:  
0.005% for 2, 4 or 8 ohm loads  
Input Impedance  
10,000 ohms Balanced or Unbalanced Inputs  
Wide Band Damping Factor  
100 @ 8ohms  
18  
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Packing Instructions  
Packing Instructions  
Quantity Part Number  
Description  
In the event it is necessary to repack the equipment for  
shipment, the equipment must be packed exactly as shown  
below. It is very important that the four feet are attached to  
the bottom of the equipment. This will ensure the proper  
equipment location on the bottom foam pad. Failure to do  
this will result in shipping damage.  
Use the original shipping carton and interior parts only  
if they are all in good serviceable condition. If a shipping  
carton or any of the interior part(s) are needed, please call  
or write Customer Service Department of McIntosh Labo-  
ratory. Please see the Part List for the correct part numbers.  
1
1
1
4
3
2
034104  
034105  
033003  
018445  
034106  
034107  
Shipping carton bottom  
Shipping carton top  
Poly bag  
Feet  
Foam ring  
Foam pad (top and bottom)  
19  
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McIntosh Laboratory, Inc.  
2 Chambers Street  
Binghamton, NY 13903  
McIntosh Part No. 040727  
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