McIntosh | MC1201 | Owner`s manual | McIntosh MC1201 Owner`s 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
The lightning flash with arrowhead,
within an equilateral triangle, is intended
to alert the user to the presence of
uninsulated “dangerous voltage” within
the product’s enclosure that may be of
sufficient magnitude to constitute a risk
of electric shock to persons.
WARNING - TO REDUCE RISK OF
FIRE OR ELECTRICAL SHOCK, DO
NOT EXPOSE THIS EQUIPMENT TO
RAIN OR MOISTURE.
IMPORTANT SAFETY
INSTRUCTIONS!
PLEASE READ THEM BEFORE
OPERATING THIS EQUIPMENT.
General:
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Warning: To reduce risk of fire or electrical shock,
do not expose this equipment to rain or moisture.
This unit is capable of producing high sound pressure levels. Continued exposure to high sound pressure levels can cause permanent hearing impairment or loss. User caution is advised and ear protection is recommended when playing at high volumes.
6. Caution: to prevent electrical shock do not use this
(polarized) plug with an extension cord, receptacle
or other outlet unless the blades can be fully inserted to prevent blade exposure.
Attention: pour pevenir les chocs elecriques pas
utiliser cette fiche polarisee avec un prolongateur,
une prise de courant ou un autre sortie de courant,
sauf si les lames peuvent etre inserees afond ans en
laisser aucune partie a decouvert.
7. Unplug this equipment during lightning storms or
when unused for long periods of time.
8. Only use attachments/accessories specified by the
manufacturer.
2
The exclamation point within an equilateral triangle is intended to alert the
user to the presence of important
operating and maintenance (servicing) instructions in the literature accompanying the appliance.
NO USER-SERVICEABLE PARTS
INSIDE. REFER SERVICING TO
QUALIFIED PERSONNEL.
To prevent the risk of electric shock, do not remove cover or
back. No user serviceable parts inside.
Installation:
9. The equipment shall be installed near the AC Socket
Outlet and the disconnect device shall be easily accessible.
10. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
11. Do not install near any heat sources such as radiators,
heat registers, stoves, or other equipment (including
amplifiers) that produce heat.
12. Do not use this equipment near water.
13. Do not expose this equipment to dripping or splashing
and ensure that no objects filled with liquids, such as
vases, are placed on the equipment.
14. Use only with the cart, stand, tripod,
bracket, or table specified by the manufacturer, or sold with the equipment.
When a cart is used, use caution when
moving the cart/equipment combination
to avoid injury from tip-over.
Connection:
15. Connect this equipment only to the type of AC power
source as marked on the unit.
16. Protect the power cord from being walked on or
pinched particularly at plugs, convenience receptacles,
and the point where they exit from the equipment.
17. Do not defeat the safety purpose of the polarized or
grounding-type plug.
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.
18. Do not overload wall outlets, extension cords or integral 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.
Care of Equipment:
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.
Repair of Equipment:
23. Refer all servicing to qualified service personnel. Servicing is required when the equipment has been damaged 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 referred to qualified service personnel.
25. When replacement parts are required, be sure the service technician has used replacement parts specified by
McIntosh or have the same characteristics as the original part. Unauthorized substitutions may result in fire,
electric shock, or other hazards.
26. Upon completion of any service or repairs to this product, ask the service technician to perform safety checks
to determine that the product is in proper operating
condition.
Thank You
Your decision to own this McIntosh MC1201 Power Amplifier ranks you at the very top among discriminating music 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.
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:
Serial Number:
Purchase Date:
Dealer Name:
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 additional help concerning a suspected problem, you can receive technical assistance for all McIntosh products at:
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 assistance 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
Table of Contents
Introduction
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
Now you can take advantage of traditional McIntosh standards 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 absolutely accurate. The McIntosh Sound is “The Sound of the
Music Itself.”
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.
2. For additional connection information, refer to the owner’s
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.
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
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.
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
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.
·
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.
·
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.
·
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 loudspeakers.
·
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.
Introduction, Performance Features and Dimensions
The following dimensions can assist in determining the
best location for your MC1201. There is additional information on the next page pertaining to installing the
MC1201 into cabinets.
17-3/4"
45.09cm
11"
Front View of the MC1201
12-5/16"
27.94cm
31.27cm
17-3/8"
44.15cm
Rear View of the MC1201
12-1/4"
31.11cm
19-1/2"
49.50cm
18"
1-5/8"
45.72cm
4.12cm
Side View of the MC1201
10-1/2"
3/16"
26.70cm
0.48cm
1-1/2"
3.81cm
14"
1-9/16"
35.60cm
3.96cm
5
Installation
Installation
Caution: The MC1201 Amplifier weight is 147 pounds
(66.7 kilograms). It requires two or more persons
to safely handle when moving the amplifier.
(5.08 cm) in front of the mounting panel for handle clearance. Be sure to cut out a ventilation hole in the mounting
shelf according to the dimensions in the drawing.
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
MC1201 Front Panel
custom installation and used
Custom Cabinet Cutout
free standing. It also can be
custom installed in a piece of
furniture or cabinet of your
choice. The required panel cutout, ventilation cutout and unit
dimensions are shown.
Always provide adequate
ventilation for your MC1201.
Cabinet
Cool operation ensures the
Front
Panel
longest possible operating life
for any electronic instrument.
Do not install the MC1201 diOpening
rectly above a heat generating
for Ventilation
component such as a high powered amplifier. If all the components are installed in a single
cabinet, a quiet running ventilation fan can be a definite as- MC1201 Side View
set in maintaining all the sys- in Custom Cabinet
tem components at the coolest
possible operating temperature.
A custom cabinet installation should provide the following minimum spacing dimenSupport
sions for cool operation. Allow
Shelf
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
21/32"
MC1201
Bottom
View
1.67cm
is not obstructed. Allow 22
in Custom Cabinet
inches (55.88 cm) depth behind
the front panel. Allow 2 inches
6
17-9/16"
44.62cm
10 -13/16"
27.46cm
6"
15.24cm
Cutout Opening for Custom Mounting
Chassis
Spacers
Cutout Opening for Ventilation
1"
2.54cm
14-1/2"
36.83cm
14"
Cutout Opening
for Ventilation
35.56cm
15-5/16"
38.91cm
Rear Panel Connections and Switch
BALANCED INPUT for an audio 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 component
UNBALANCED INPUT
for an audio cable from a
preamplifier or control center audio output
INPUT MODE
switch selects
balanced or
unbalanced
input
CIRCUIT BREAKER
Press to reset if the amplifier will not power
up
Connect the
MC1201 power
cord to a live AC
outlet. Refer to information on the
back panel to determine 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
How to Connect the MC1201
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.
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 McIntosh 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:
Bare wire cable ends:
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
tightly as possible.
Banana plug connection:
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 loudspeaker, being careful to observe the correct polarities. Output impedance connections of 2 ohms, 4 ohms and 8
ohms are provided. If the impedance of your loudspeaker 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
additional instruction on making
Loudspeaker Connections contact your
McIntosh Dealer or McIntosh Technical
Support.
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. Refer to figure 7.
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
connector or prepared 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. Refer to figures 4, 5 & 6.
Note: There are six openings on the bottom edge of the
cover to allow for the Loudspeaker’s 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.
6. Connect the MC1201 power cord to an active AC outlet.
Terminal
Connections
Cover
Rear
Chassis
Handle
Cover
Mounting
Screw
Locations
Cover
Mounting
Screw
Locations
Cable Openings
Figure 7
8
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
Front Panel Displays and Controls
METER indicates
the Power Output
of the amplifier
METER Switch selects
the display modes of the
Power Output Meter
10
POWER GUARD LED
lights when the amplifier
POWER GUARD circuit
activates
Remote On
Indicator lights
when the amplifier is in the
Remote TurnOn Mode
POWER Switch Turns
AC power On/Off, or
On/Remote
How to Operate the MC1201
How to Operate the MC1201
Power On
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 operation, rotate the power switch
to the On or Off position as desired. Refer to figure 8.
Note: There must be a power
control connection
between the MC1201 and
Figure 8
the McIntosh Control
Center, in order for the remote power turn-on to
function.
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 continue to indicate
the power output.
Watts- The meters respond to all the
musical information being proFigure 9
duced by the amplifier. 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 electronically held to this power level until a
higher power peak passes through the ampli-
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.
Input Mode Switch
The Input Mode Switch, which is located on the Rear
Panel of the MC1201, allows
you to select either the Balanced or Unbalanced Input. Refer to figure 11.
Figure 11
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
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 created a power amplifier without compromise, using the most
advanced McIntosh circuit design concepts.
A continuous average power output rating of 1,200
watts and with an output current of greater than 200 amperes, 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
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
to make accurate readings. The MC1201 can deliver the
best possible performance from any type of high quality
loudspeaker system.
Creating an amplifier with this level of performance did
not come easily. Many months of design, testing and measuring 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
Technical Description
Design Philosophy
The design philosophy incorporated in the MC1201 involved several different techniques, all based on sound scientific logic. Every stage of voltage or current amplification must be as linear as possible prior to the use of negative 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.
Double Balanced Push-Pull design is used from input to
output. Each half of the amplifier contains complimentary
balanced circuitry. The resulting double balanced configuration cancels even order distortion. Refer to figure 12.
All transistors are selected to have nearly constant current gain over the entire current range they must cover.
Output transistors in particular, have matched uniform current gain, high current bandwidth product and large active
region safe operating area. An automatic tracking bias system completely eliminates any trace of crossover distortion. Precision metal film resistors and low dielectric absorption film capacitors are used in all critical circuit locations.
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 high efficiency circuit design of the MC1201 contributes to low operating temperatures. More than 290
square inches of heat sink area keep the MC1201 operating
safely with convection cooling. No fans are needed.
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 parallel, 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
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 reducing the life expectancy of the power amplifier. Refer to
figure 13.
Figure 13
There is absolutely no performance limitation with an
Autoformer. Its frequency response exceeds that of the output circuit itself, and extends well beyond the audible
range. Its distortion level is so low it is virtually impossible
to measure.
In the rare event of a power amplifier output circuit failure, the McIntosh Autoformer provides absolute protection
from possible damage to your valuable loudspeakers. The
unequaled expertise of McIntosh in the design and manufacturing of Autoformers is legendary in the high fidelity
industry. McIntosh engineers know how to do it right.
Figure 14
14
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 output 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 professional 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 Sentry Monitor Output Transistor Protection Circuit. Refer to
Figure 15. There is absolutely no compromise in sonic performance with this
circuit, and it ensures safe operation of the amplifier under even the
most extreme operating conditions.
The different types
of protection circuits incorporated
in the MC1201 insure a long and
Figure 15
safe operating life.
This is just one of
the many characteristics of McIntosh Power Amplifiers
that make them world famous.
The MC1201 also includes the unique patented McIntosh 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 audible distortion is unpleasant to hear, but the
inaudible ultrasonic distortion is also undesirFigure 16
Technical Description, con’t
Without Power Guard
able, since it can damage
valuable loudspeaker system tweeters. You will
never experience the
harsh and damaging distortion due to clipping.
The Power Guard circuit is a waveform comparator, monitoring both
the input and output
waveforms. Under normal operating conditions,
there are no differences
Figure 17
between the shape of
these waveforms. If an amplifier channel is overdriven,
there will be a difference between the two signal waveforms. When the difference exceeds 0.3% (equivalent to
0.3% harmonic distorWith Power Guard
tion), the Power Guard
activates the PG light and
a dynamic electronic attenuator at the amplifier
input reduces the input
volume just enough to
prevent any further increase in distortion. The
Power Guard circuit acts
so fast that there are absolutely no audible side
effects and the sonic purity of the music reproFigure 18
duction is perfectly preserved. The MC1201 Power Amplifier with Power Guard
is not limited to just the rated power output, but will actu-
ally produce distortion free output well above its rated
power due to the McIntosh philosophy of conservative design.
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 System 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 output 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 dynamic range that “Digital Audio” demands.
Block Diagram
of the
Power Supply
Figure 19
15
16
Notes
17
Specifications
Specifications
Power Output
Minimum sine wave continuous average power output is:
1,200 watts into 2 ohm load
1,200 watts into 4 ohm load
1,200 watts into 8 ohm load
Rated Power Band
20Hz to 20,000Hz
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
Power Requirements
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
Note: Refer to the rear panel of the MC1201 for the correct
voltage.
Dynamic Headroom
2.1dB
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.
Frequency Response
+0, -0.25dB from 20Hz to 20,000Hz
+0, -3dB from 10Hz to 100,000Hz
Weight
147 pounds (66.7 kg) net, 172 pounds (78.0 kg) in shipping
carton
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 instantaneous 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
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Packing Instructions
Packing Instructions
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 Laboratory. Please see the Part List for the correct part numbers.
Quantity
1
1
1
4
3
2
Part Number
034104
034105
033003
018445
034106
034107
Description
Shipping carton bottom
Shipping carton top
Poly bag
Feet
Foam ring
Foam pad (top and bottom)
19
McIntosh Laboratory, Inc.
2 Chambers Street
Binghamton, NY 13903
McIntosh Part No. 040727
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