McIntosh MC7205 THX User manual

McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 139 3-2699 Phone: [phone] FAX: [phone]
OWNERS
MANUAL
MC7205
MC7205 THX® Five Channel Power Amplifier
THX is a registered trademarks of Lucasfilm, Ltd. Manufactured under license from Lucasfilm Ltd.

2
Thank You.......................................................................... 2
Please Take a Moment ....................................................... 2
Customer Service............................................................... 2
Table of Contents ............................................................... 2
Safety Instructions ............................................................. 3
Introduction ....................................................................... 4
Performance eatures ........................................................ 4
Installation ......................................................................... 5
Rear Panel Controls and Connections ............................... 6
How to Connect ................................................................. 7
ront Panel Displays and Controls .................................... 8
How to Operate .................................................................. 9
Specifications .................................................................. 10
Packing Instruction .......................................................... 11
NOTES:
1. Connecting Cables and Connectors are available from the
McIntosh Parts Department:
Data and Power Control Cable Part No. 170-202
Six foot, shielded 2 cond ctor, with 1/8 inch stereo mini
phone pl gs on each end.
Control Center to Multi Channel Power A plifier Cable
Part No. 170-631
Six foot, DB25, shielded, straight thro gh, 25 cond ctor
male-to-female cable.
2. For additional connection information, refer to the owners
man al(s) for any component(s) connected to the MC7205
Amplifier.
3. There is a b ilt-in t rn on delay which will m te the speaker
o tp ts for approximately two seconds when the amplifier is
t rned on.
4. It is very important that lo dspeaker cables of adeq ate size
be sed in yo r m sic system, to ens re that there will be no
power loss or heating. Cable size is specified in Ga ge
n mbers or AWG, (American Wire Ga ge). The smaller the
Ga ge n mber, the larger the wire size:
If yo r lo dspeaker cables are 25 feet (7.62m) or less, se
at least 16 Ga ge (AWG) wire size or larger.
If yo r lo dspeaker cables are 50 feet (38.1m) or less, se
at least 14 Ga ge (AWG) wire size or larger.
If yo r lo dspeaker cables are 100 feet (76.2m) or less, se
at least 12 Ga ge (AWG) wire size or larger.
5. CAUTION: When the MC7205 amplifier is sed in specific
Co ntries (A stria, Belgi m, Germany, Denmark,
Spain, Finland, France, United Kingdom, Greece,
Ireland, Italy, L xembo rg, The Netherlands,
Port gal, Sweden), only lo dspeakers of 8 ohms
impedance or higher sho ld be connected.
Thank You, Please Take A Moment,
Customer Servi e and Table of Contents
Table of ContentsThank You
Te hni al Assistan e
Customer Servi e
Copyright 1999 ã by McIntosh Laboratory, Inc.
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:
Your decision to own this McIntosh MC7205 ive Channel
Power Amplifier ranks you at the very top among discrimi-
nating 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.
Serial Number:
Pur hase Date:
Dealer Name:
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:
McIntosh Sales Corporation
661 W. Redondo Beach Blvd.
Gardena, CA 90247
Phone: [phone]
ax: 310-217-9288
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 Repair department.
or assistance on factory repair return procedure, contact
the McIntosh Repair Department at:
McIntosh Laboratory, Inc.
2 Chambers Street
Binghamton, New York 13903
Phone: [phone]
ax: 607-723-1917

3
IMPORTANT SAF TY
INSTRUCTIONS!
PLEASE READ THEM BEFORE
OPERATING THIS EQUIPMENT.
Safety Instru tions
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-
tute a risk of electric shock to persons.
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.
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. 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.
3. Adhere to all warnings and operating instructions.
4. ollow all operating and use 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 pres-
sure levels. ontinued 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. aution: 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.
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. or 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.
8. Do not use attachments not recommended in this
owners manual as they may cause hazards.
Installation:
9. Locate the equipment for proper ventilation. or 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.
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.
onnection:
14. Connect this equipment only to the type of AC power
source as marked on the unit.
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.

4
Performan e Features
Safety Instru tions ont,
Introdu tion and Performan e Features
·Power Output
The MC7205 consists of five separate power amplifier
channels with less than 0.005% distortion at rated power
output. This is over 600 watts of McIntosh power in a
single package.
·Power Guard
All five 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 are present on all five channels to ensure the
MC7205 will have a long and trouble free operating life.
Built-in thermal protection circuits guard against overheat-
ing which could shorten the normal long life expectancy of
your McIntosh power amplifier.
·Direct urrent Protection
Direct Current sensing circuits on each channel provide
extra protection for your valuable loudspeakers.
·Illuminated Power Meters
Three front panel, illuminated output wattmeters can be
selected to precisely indicate the power output of each of
the five channels as well as the relative power output pro-
duced by a THX certified powered subwoofer amplifier.
·onvenient Single able Hookup
A rear panel connector provides for the convenience of us-
ing a single cable, (DB25 computer style) to receive all au-
dio and power control signals from a McIntosh THX Con-
trol Center.
Introdu tion
Now you can take advantage of traditional McIntosh stan-
dards of excellence in the MC7205, power amplifier. ive
200 watt, high current output channels will deliver out-
standing audio performance for your McIntosh Home The-
ater System. The MC7205 is THX certified and easily
meets the demanding Lucasfilm, Ltd., standards for accu-
racy in home theater electronics.
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.
are 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.
20. Unplug the power cord from the AC power outlet
when left unused for a long period of time.
Repair of Equipment:
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.
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.
E. The equipment has been dropped or damaged in any
way.
. 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.
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.

5
Installation
The MC7205 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 MC7205.
Cool operation ensures the longest possible operating life
for any electronic instrument. Do not install the MC7205
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.
Installation
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Front View of a M 7205
custom installed
A custom cabinet installation should provide the follow-
ing minimum spacing dimensions for cool operation. Allow
a ventilation opening of 6 inches (15.24 cm) in height, run-
ning the full width of the front panel, directly above the
front top of the MC7205. Provide additional ventilation of
2 inches (3.81cm) below the bottom and 1 inch (2.54 cm)
on each side of the amplifier, so that airflow is not ob-
structed. Allow 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.
Side View of a M 7205
custom installed
Bottom View of a M 7205
custom installed

6
MC7205 Rear Panel Controls and
Conne tions
MC7205 Rear Panel Controls and
Conne tions
Connect the MC7205
power cord to a live
AC outlet. Refer to in-
formation on the back
panel to determine the
correct voltage
NPUTS for discrete audio cables
from a preamplifier or control
center audio outputs
THX NPUT Connector
accepts a 25 conductor
cable that connects all
audio and power control
signals from a Mc ntosh
Control Center
ndividual nput
LEVEL controls for
Right channels and
Center channel
POWER CONTROL n receives
turn on/off signals from a Mc ntosh
component and the POWER CON-
TROL Out sends that turn on/off
signal to the next Mc ntosh compo-
nent
OUPUT Connections
for loudspeakers
SUB N/OUT accepts a
subwoofer input signal to
activate the subwoofer
power meter circuit. f a 25
conductor cable is being
used with a Mc ntosh Con-
trol Center this jack will
provide a signal out to a
subwoofer amplifier
NPUTS for discrete audio cables
from a preamplifier or control
center audio outputs
NPUT for discrete audio cable
from a preamplifier or control
center audio output
ndividual nput
LEVEL controls
for the Left chan-
nels
Main Fuse holder,
refer to infromation
on the back panel
of your MC7205 to
determine the cor-
rect fuse size and
rating
SUB METER CAL
control for meter
calibration of the
Subwoofer Channel
OUPUT Connections
for loudspeakers
OUPUT Connections
for loudspeakers

7
How to Conne t the MC7205
To AC
Outlet
How to Conne t the MC7205
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Front
Right
Speaker
Surround
Left
Speaker
Surround
Right
Speaker
Front
Left
Speaker
Front
Center
Speaker
McIntosh SL-1 Power Sub-Woofer
1. Connect the MC7205 power cord to a live AC outlet.
2. 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 wire accessible. Refer to
figure 1.
B. If the cable is stranded, carefully twist the strands
together as tightly as possible. Refer to figures 2 &
3.
Note: If desired, the twisted
cable section can be
tinned with a solder iron
to keep the strands
together and/or attach
appropriate connector
ends.
C. Insert the bare section of the
cable end or connector 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. Refer to figure 4.
D. Insert the bare section of the cable end or connector
into the access hole, and tighten the terminal nut
clockwise until the cable is firmly clamped into the
terminal. Refer to figures 5 & 6.
Note: The bare sections of the cable ends or the non
ins lated part of the connectors m st 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.
3. Connect the loudspeaker cables to the
appropriate output connectors, being
careful to observe the correct polari-
ties and install the protective covers
that were supplied. Refer to figure 7.
4. Connect a single DB25 computer type
cable from the multi-channel output
of a control center to the THX Input
connector for all six audio channels
and power control.
5. Connect the MC7205 Sub In/Out to the McIntosh SL-1
Subwoofer THX input and a power control cable from
the MC7205 Power Control Out to the SL-1 Power
Control In.
Note: An optional hook p is to se discrete cables from a
McIntosh Control Center to inp ts of the MC7205.
Connect a Y adapter to the Control Center
S bwoofer O tp t, with one cable to the SL-1
s bwoofer THX inp t and a second cable to the
MC7205 S b In/O t jack. Connect a power control
cable from the Control Center Power Control O t to the
MC7205 power control in jack and connect a power
control cable from the MC7205 Power Control O t to
the SL-1 Power Control In.
McIntosh MX132 A/V Control Center
Figure 7

8
MC7205 Front Panel Displays
and Controls
MC7205 Front Panel Displays and Controls
METERS indicate power out-
put of the amplifier channels
according to the Meter switch
setting
METER LEDs
ndicate which
channel(s) the
power meter is
reading
METER Switch selects
the display modes of the
power output meters
POWER GUARD LEDs
light when the amplifier
channel POWER GUARD
circuit activates
POWER Switch Turns
AC power on/off, or on/
remote
Remote On
ndicator
POWER GUARD LEDs
light when the amplifier
channel POWER GUARD
circuit activates
POWER GUARD
LEDs light when the
amplifier channel
POWER GUARD
circuit activates
METER LEDs
ndicate which
channel(s) the
power meter is
reading
METER LEDs
ndicate which
channel(s) the
power meter is
reading
METER LEDs
ndicate which
channel(s) the
power meter is
reading

9
How to Operate the
MC7205
How to Operate the MC7205
Input Level ontrols
When using a McIntosh Control Center set all five level
controls to the 2V position. If a preamplifier or control cen-
ter has a 1V output rating and/
or a built-in THX module, set
the controls to the 1V position.
If an increase or decrease in
amplifier sensitivity is required
for other applications, set the
controls as desired. Refer to
igure 8.
Subwoofer Meter alibration
When using a McIntosh SL-1 powered subwoofer, set the
Sub Meter Cal control to the 1V THX position for the cor-
rect subwoofer amplifier power output indication. Refer to
igure 8.
Power On
To have the MC7205 turn on or off when a control center
turns on or off, rotate the power switch to the remote posi-
tion. or manual operation, rotate the power switch to the
on or off position as desired.
Note: There m st be a power control connection between the
MC7205 and the McIntosh Control Center in order for
the remote power t rn on to f nction.
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
are in the summed mode.
Summed - Each meter displays the combined outputs of
two channels. The left meter indicates the left
front combined with the left surround, the cen-
ter meter indicates the center combined with
the subwoofer and the right meter indicates
the right front combined with the right sur-
round. In this meter mode refer to the upper
meter scale(s).
ront/Ctr - The left meter indicates the left front channel,
the center meter indicates the center channel
and the right meter indicates the right front
channel. In this meter mode refer to the lower
meter scale(s).
Surr/Sub - The left meter indicates the left surround chan-
nel, the center meter indicates the relative
power of the subwoofer amplifier and the right
meter indicates the right surround channel. In
this meter mode refer to the lower meter
scale(s).
Note: When the MC7205 is connected to a McIntosh MX132
A/V Control Center with a 25 cond ctor cable, the
meters will a tomatically indicate the o tp t of each
individ al channel d ring the Speaker Level Set p
Operation of the MX132. This f nction is independent of
any Meter Mode selections on the MC7205.
How to Read the Power Output Meters
The MC7205 Power Output Meter scales are based on us-
ing 4 ohm loudspeakers. If 8 ohm speakers are used, the
actual power output is one half the power available to drive
4 ohm loudspeakers. Use the chart(s) below to determine
the actual power output sent to your loudspeakers. Refer to
figure 9.
CAUTION: When the MC7205 amplifier is sed in specific
Co ntries (A stria, Belgi m, Germany, Denmark,
Spain, Finland, France, United Kingdom, Greece,
Ireland, Italy, L xembo rg, The Netherlands,
Port gal, Sweden), only lo dspeakers of 8 ohms
impedance or higher sho ld be connected.
Figure 8
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1
Spe ifi ations
Spe ifi ations
Power Output Per hannel
200 watts into 4 ohm loads or 120 watts into 8 ohm loads
minimum sine wave continuous average power output per
channel, all channels operating.
Output Load Impedance
8 or 4 ohms
Rated Power Band
20Hz to 20,000Hz
Dynamic Headroom
1.6dB
Frequency Response
+0, -0.25dB from 20Hz to 20,000Hz
+0, -3dB from 10Hz to 100,000Hz
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
113dB below rated output, (A Weighted)
Sensitivity
1 volt (2.0V at level control center detent position)
Input Impedance
10,000 ohms
Damping Factor (Wide Band)
200 @ 8 ohms
100 @ 4 ohms
Power Supply Energy Storage
215 Joules
Power Requirements
100 Volts, 50/60Hz at 1080 watts
110 Volts, 50/60Hz at 1080 watts
120 Volts, 50/60Hz at 1080 watts
220 Volts, 50/60Hz at 1080 watts
230 Volts, 50/60Hz at 1080 watts
240 Volts, 50/60Hz at 1080 watts
NOTE: Refer to the rear panel of the MC7205 for the correct
voltage.
Dimensions
ront Panel: 17/1/2 inches (44.5cm) wide, 7-1/16 inches
(17.9cm) high. Depth behind front mounting panel is 21
inches (53.3cm) including clearance for connectors. Panel
clearance required in front of mounting panel is 1-1/8
inches (2.9cm).
Weight
53 pounds (24Kg) net, 72 pounds (32.7Kg) in shipping car-
ton
Spe ifi ations for Use in Certain Countries
CAUTION: When the MC7205 amplifier is sed in specific
Co ntries (A stria, Belgi m, Germany, Denmark,
Spain, Finland, France, United Kingdom, Greece,
Ireland, Italy, L xembo rg, The Netherlands,
Port gal, Sweden), only lo dspeakers of 8 ohms
impedance or higher sho ld be connected. All of
above specifications are the same for se except for
the following:
Power Output Per hannel
120 watts into 8 ohm loads minimum sine wave continuous
average power output per channel, all channels operating.
Output Load Impedance
8 ohms
Damping Factor (Wide Band)
200 @ 8 ohms

11
Pa king Instru tions
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. Three #10 x 2-1/4
screws and washers must be used to fasten the unit securely
to the bottom pad and wood skid. This will ensure the
proper equipment location on the bottom pad. ailure 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.
Quantity Part Number Description
1 033888 Shipping carton only
4 033887 End cap ( oam pad)
1 033697 Inside carton only
1 033725 Top Pad
1 034008 Bottom pad
3 017218 Plastic foot (spacer)
1 033699 Wood skid
3 101169 #10 x 2-¼ Wood screw
3 104033 #10 x 1-¾ Wood screw
4 017218 Plastic foot
4 100159 #10-32 x ¾ Machine screw
4 104083 #10 x 7/16 lat washer
1 040542 Shipping carton complete with
all the above parts
Pa king Instru tions

McIntosh Part No. 04053902
McIntosh Laboratory, Inc.
2 Chambers Street
Binghamton, NY 13903