OWNER’S
MANUAL
MC352 Power Amplifier
MC352
McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 FAX: 607-724-0549
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Safety Intructions
IMPORTANT SAFETY
INSTRUCTIONS!
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.
PLEASE READ THEM BEFORE
OPERATING THIS EQUIPMENT.
7. For added protection for this product during a lightning
storm, or when it is left unattended and unused for long
periods of time, unplug it from the wall outlet. This
will prevent damage to the product due to lightning or
power line surges.
WARNING SHOCK HAZARD -
DO NOT OPEN.
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 consti-
8. Do not use attachments not recommended in this
owner’s manual as they may cause hazards.
tute a risk of electric shock to persons.
Installation:
AVIS RISQUE DE CHOC -
NE PAS OUVRIR.
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.
9. Locate the equipment for proper ventilation. For ex-
ample, the equipment should not be placed on a bed,
sofa, rug, or similar surface that may block ventilation
openings; or, placed in a built-in installation, such as a
bookcase or cabinet, that may impede the flow of air
through the ventilation openings.
NO USER-SERVICEABLE
PARTS INSIDE. REFER
SERVICING TO
10. Locate the equipment away from heat sources such as
radiators, heat registers, stoves, or other appliance (in-
cluding amplifiers) that produce heat.
11. Mount the equipment in a wall or cabinet only as de-
scribed in this owner’s manual.
12. Do not use this equipment near water; for example,
near a bathtub, washbowl, kitchen sink, laundry tub, in
a wet basement or near a swimming pool, etc.
13. Do not place this product on an unstable cart, stand,
tripod, bracket, or table. The equipment may fall, caus-
ing serious injury to a person, and serious damage to
the product.
QUALIFIED PERSONNEL
To prevent the risk of electric shock, do not remove
cover (or back). No user serviceable parts inside. Refer
servicing to qualified personnel.
General:
1. Read all the safety and operating instructions, con-
tained in this owner’s manual, before operating this
equipment.
2. Retain this owner’s manual for future reference about
safety and operating instructions.
Connection:
14. Connect this equipment only to the type of AC power
source as marked on the unit.
3. Adhere to all warnings and operating instructions.
4. Follow all operating and use instructions.
15. Route AC power cords so that they are not likely to be
walked on or pinched by items placed upon or against
them, paying particular attention to cords at plugs, con-
venience receptacles, and the point where they exit
from the instrument.
16. Do not defeat the inherent design features of the polar-
ized plug. Non-polarized line cord adapters will defeat
the safety provided by the polarized AC plug. If the
plug should fail to fit, contact your electrician to re-
place your obsolete outlet. Do not defeat the safety
purpose of the grounding-type plug.
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 pres-
sure levels. Continued exposure to high sound pres-
sure levels can cause permanent hearing impair-
ment or loss. User caution is advised and ear protec-
tion 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 in-
serted to prevent blade exposure.
3
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Safety Instructions con’t,
Introduction and Performance Features
17. Do not overload wall outlets, extension cords or inte-
gral convenience receptacles as this can result in a risk
of fire or electric shock.
Introduction
Now you can take advantage of traditional McIntosh stan-
dards of excellence in the MC352 Power Amplifier. Two
350 watt high current output channels will drive any high
quality loudspeaker system to its ultimate performance.
The MC352 reproduction is sonically transparent and abso-
lutely accurate. The McIntosh Sound is “The Sound of the
Music Itself.”
Care of Equipment:
18. Clean the instrument by dusting with a dry cloth. Un-
plug this equipment from the wall outlet and clean the
panel with a cloth moistened with a window cleaner.
Do not use liquid cleaners or aerosol cleaners.
19. Do not permit objects of any kind to be pushed and/or
fall into the equipment through enclosure openings.
Never spill liquids into the equipment through enclo-
sure openings.
Performance Features
· Power Output
The MC352 consists of two separate power amplifier chan-
nels, each capable of 350 watts into 2, 4 or 8 ohm speakers
with less than 0.005% distortion.
20. Unplug the power cord from the AC power outlet
when left unused for a long period of time.
· Full Balanced Circuity
Repair of Equipment:
The MC352 is fully balanced from inputs to outputs. Each
channel consists of two matched power amplifiers operat-
ing in push-pull with their outputs combined in a McIntosh
Autoformer. The double balanced configuration cancels
virtually all distortion.
21. Unplug this equipment from the wall outlet and refer
servicing to a qualified service personnel under the fol-
lowing conditions:
A. The AC power cord or the plug has been damaged.
B. Objects have fallen, or liquid has been spilled into
the equipment.
· Power Guard
C. The equipment has been exposed to rain or water.
D. The equipment does not operate normally by fol-
lowing the operating instructions contained within
this owner’s manual. Adjust only those controls
that are covered by the operating instructions, as an
improper adjustment of other controls may result
in damage and will often require extensive work by
a qualified technician to restore the product to its
normal operation.
Both channels include 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 MC352 will have a long and trouble free
operating life. Built-in thermal protection circuits guard
against overheating.
E. The equipment has been dropped or damaged in any
way.
F. The equipment exhibits a distinct change in perfor-
mance - this indicates a need for service.
22. Do not attempt to service beyond that described in the
operating instructions. All other service should be re-
ferred to qualified service personnel.
23. 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.
· Patented Autoformers
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 give perfect DC protection for your valuable loud-
speakers.
· Illuminated Power Meters
The illuminated power output watt meters on the MC352
are peak responding, and indicate the true power output of
the amplifier. The Peak Hold Mode allows the meters to
temporarily stay at the highest power output and then
slowly decay.
24. 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.
4
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Installation
A custom cabinet installation should provide the follow-
ing minimum spacing dimensions 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. Al-
low 21 inches (53.3 cm) depth behind the mounting panel,
which includes clearance for connectors. Allow 1-1/8
inches (2.9 cm) in front of the mounting panel for knob
clearance. Be sure to cut out a ventilation hole in the
mounting shelf according to the dimensions in the drawing.
NOTE: In Europe, if the MC352 is custom mounted, an
additional ventilation opening of 6 inch (15.24 cm) in
Installation
The MC352 can be placed upright on a table or shelf,
standing on its four feet. 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 MC352.
Cool operation ensures the longest possible operating life
for any electronic instrument. Do not install the MC352
directly above a heat generating 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 defi-
nite asset in maintaining all the system components at the
coolest possible operating temperature.
height, running the full width of the front panel, needs to
be directly above the front top of the MC352.
17-1/2"
444mm
17-1/16"
433.4mm
1/4"
6mm
Outline of Front Panel
Edge of Cutout
7/32"
5.3mm
Front View of the MC352
custom installed
End Caps
8.89"
225.8mm
Panel Height
8-13/16"
223.8mm
8-3/8"
212.7mm
(Front View)
3/16"
5.1mm
Support Shelf
Bottom of Cutout and Top
of Support Shelf Must
Coincide
Mounting Surface
See the note above
Mounting Bracket at Both Sides of the Rear Panel.
Fasten with 6-32 x 3/8 Machine Screw and Washer to Chassis.
Fasten with 6 x 1/2 Wood Screw and Washer to Support Shelf
Outline of Unit
(Side View)
Side View of the MC352
custom installed
Support Shelf
Cut Out Center
for Ventilation
Mounting Surface
Cut Out Center
for Ventilation
15"
Bottom View of the MC352
custom installed
(Bottom View)
6"
9"
5
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MC352 Rear Panel Controls and
Connections
MC352 Rear Panel Controls and Connections
BALANCED INPUTS for audio
cables from a preamplifier or
control center audio outputs
POWER CONTROL In receives
turn on/off signals from a McIntosh
component and the POWER CON-
TROL Out sends that turn on/off
signal to the next McIntosh compo-
nent
UNBALANCED IN-
PUTS for audio cables
from a preamplifier or
control center audio out-
put
INPUT MODE switch
selects different modes
of operation
OUTPUT MODE
switch selects
different modes
of operation
Connect the MC352
power cord to a live
AC outlet. Refer to
information on the
back panel to deter-
mine the correct
voltage
OUTPUT Connections
for 2 ohm loudspeakers
OUTPUT Connections for
4 or 8 ohm loudspeakers
OUTPUT Connections for
4 or 8 ohm loudspeakers
Main Fuse holder,
refer to infromation
on the back panel
of your MC352 to
determine the cor-
rect fuse size and
rating
6
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How to Connect the MC352
into the terminal. Refer to figures 5 & 6.
Note: The bare sections of the cable ends or the non
insulated part of the connectors must not be exposed on
either side of the terminal access hole.
E. Repeats Steps A through D for each speaker cable
used with the amplifier.
How to Connect the MC352
1. Connect the MC352 power cord to a live AC outlet.
2. Connect a power control cable from the control center
Power Control Out to the MC352 Power Control In.
3. Prepare the loudspeaker hookup cables as follows:
A. Carefully remove sufficient insulation from the
loudspeaker cable ends to just fit within the bind-
ing post with no exposed
4. Connect the loudspeaker cables to the appropriate termi-
nals for your loudspeakers, 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 loudspeakers
wire accessible. Refer to
figure 1.
B. If the cable is stranded,
is rated at other than the listed imped-
ance connections, use the nearest lower
connection.
carefully twist the strands
together as tightly as pos-
sible. Refer to figures 2
& 3.
5. Install the plastic protective loudspeaker
terminal covers that were supplied with Figure 7
your amplifier. Refer to figure 7.
Note: If desired, the
twisted cable section
6. Connect a cable from the balanced outputs of a control
center to the MC352 balanced Input connectors for both
audio channels and power control.
can be tinned with a
solder iron to keep
the strands together
and/or attach
appropriate
connector ends.
Note: An optional hookup is to use unbalanced cables from a
McIntosh Control Center to Unbalanced Inputs of the
MC352.
C. Insert the bare section of the cable end or connec-
tor into the access hole, and tighten the terminal
nut clockwise until the cable is firmly clamped
into the terminal so the wires cannot slip out. Re-
fer to figure 4.
McIntosh C42 Audio Control Center
D. Insert the bare section of the cable end or connec-
tor into the access hole, and tighten the terminal
nut clockwise until the cable is firmly clamped
ToAC Outlet
Right Loudspeaker
4ohm
Left Loudspeaker
4ohm
7
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MC352 Front Panel Displays
and Controls
MC352 Front Panel Displays and Controls
METER indicates the Left Channel
Power Output of the amplifier
METER indicates the Right Channel
Power Output of the amplifier
POWER GUARD LED’s
light when the amplifier
channel POWER GUARD
circuit activates
Remote On
Indicator
METER Switch selects
the display modes of the
power output meters
POWER Switch Turns
AC power on/off, or on/
remote
8
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How to Operate the
MC352
Input Mode Switch
The Input Mode Switch allows you to select either the Bal-
anced or Unbalanced inputs.
How to Operate the MC352
Power On
To have the MC352 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.
Note: There must be a power control connection between the
MC352 and the McIntosh Control Center, in order for
the remote power turn on to function.
How to Operate the MC352 in Mono
The MC352 can be operated in Mono Mode as a 700 watt
amplifier with output impedances of 1, 2 and 4 ohms. Refer
to the shaded areas in figure 8.
1. Set the Output Mode Switch to the MONO PARALLEL
position.
2. Connect the cable from the signal source equipment to
the R MONO Balanced or Unbalanced input and set
the Input Mode switch to match.
3. Connect the loudspeaker cables to the appropriate ter-
minals to match the impedance of your loudspeakers.
Note: Mono Parallel output connections require the chosen
impedance Plus and Minus terminals of one channel be
connected to the matching terminals on the other
channel. Refer to the connecting chart below.
Meter Selection
Rotate the meter mode switch to select the meter operation
mode you desire:
Lights Off - Meter lights are turned off and the meters will
continue to indicate the power output.
Watts- The meters respond to all the musical informa-
tion being produced by the amplifier and indi-
cate to an accuracy of at least 95% of the
power output of either amplifier channel 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. The
meter is electronically held to this power
level until another higher power peak passes
through the amplifier. 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 po-
sition or lower power level. The decay rate is
approximately 6 dB per minute.
Loudspeaker
Impedance
– (Negative)
+ (Positive)
Output Terminal
Output Terminal
1Ω (ohms)
2Ω (ohms)
4Ω (ohms)
Left & Right 2Ω
Left & Right 4Ω
Left & Right 8Ω
Left & Right 2Ω
Left & Right 4Ω
Left & Right 8Ω
Note: The MC352 Power Output
Meters indicate the actual
wattage delivered to the
loudspeakers by responding
to the combination of
current and voltage output.
Output Mode Switch
The Output Mode Switch allows the two
MC352 channels to be used in two different
operating configurations.
Stereo - Both channels operate independently
as left and right 350 watt amplifiers
for stereo applications.
Mono - The right channel input signal is sent
to both amplifier channels, which are
combined at the outputs for a 700
watt mono amplifier.
Figure 8
9
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Specifications
Specifications
Power Output Stereo
Damping Factor
350 watts into 2, 4 or 8 ohm loads is the minimum sine
wave continuous average power output per channel both
channels operating.
Greater than 40
Power Requirements
100 Volts, 50/60Hz at 14.5 amps
110 Volts, 50/60Hz at 13.0 amps
120 Volts, 50/60Hz at 12.0 amps
220 Volts, 50/60Hz at 6.50 amps
230 Volts, 50/60Hz at 6.25 amps
240 Volts, 50/60Hz at 6.00 amps
Power Output Mono Parallel
700 watts into 1, 2 or 4 ohm loads is the minimum sine
wave continuous average power output.
Output Load Impedance
2, 4 or 8 ohms (Stereo Mode)
1, 2 or 4 ohms (Mono Mode)
NOTE: Refer to the rear panel of the MC352 for the correct
voltage.
Rated Power Band
20Hz to 20,000Hz
Dimensions
Front Panel: 17.50 inches (44.5cm) wide, 8.89 inches
(22.58cm) high. Depth behind front mounting panel is 21
inches (53.3cm) including clearance for connectors. Panel
clearance required in front of mounting panel is 1.125
inches (2.9cm).
Dynamic Headroom
2.1dB
Frequency Response
+0, -0.25dB from 20Hz to 20,000Hz
+0, -3dB from 10Hz to 100,000Hz
Weight
105 pounds (47.63Kg) net, 138 pounds (63Kg) in shipping
carton
Total Harmonic Distortion
0.005% maximum at any power level from 250 milliwatts
to rated power per channel from 20Hz to 20,000Hz, all
channels operating.
Intermodulation Distortion
0.005% maximum if instantaneous peak output per channel
does not exceed twice the rated output with all channels
operating for any combination of frequencies from 20Hz to
20,000Hz.
Signal To Noise Ratio (A Weighted)
85dB Unbalanced (116dB below rated output)
115dB Balanced (124dB below rated output)
Sensitivity
1.9 Volts Unbalanced Input
3.8 Volts Balanced Input
Input Impedance
20,000 ohms Unbalanced
40,000 ohms Balanced
10
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Packing Instructions
Quantity Part Number
Description
Packing Instructions
1
1
2
2
2
034051
034052
034054
034053
034055
Shipping carton bottom
Shipping carton top
Foam pad (front and rear)
Foam pad (sides)
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 plastic feet are at-
tached to the bottom of the equipment. Four 1/4-20 x 2-1/
4” cap screws and washers must be used to fasten the unit
securely to the shipping skid. This will ensure the proper
equipment location on the shipping skid. 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.
Foam pad (top and bottom)
1
1
1
1
035050
034049
034048
034056
Inner carton top
Inner carton bottom
Foam pad inner carton
Shipping skid
4
4
101212
104058
1/4-20 x 2-1/4” cap screw
Flat washer
1
049289
Shipping carton complete with
all the above parts
11
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McIntosh Laboratory, Inc.
2 Chambers Street
Binghamton, NY 13903
McIntosh Part No. 040626
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