McIntosh Stereo Amplifier MC352 User Manual

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  
1(ohms)  
2(ohms)  
4(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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