McIntosh MCC204 User Manual

Owner’s  
Manual  
MCC204 Power Amplifier  
MCC204  
McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 FAX: 607-724-0549  
Thank You  
Table of Contents  
Your decision to own this McIntosh MCC204 Four Chan-  
nel Power Amplifier ranks you at the very top among dis-  
Safety Instructions ............................................................. 2  
Thank You.......................................................................... 3  
criminating music listeners. You now have “The Best.” The Please Take a Moment ....................................................... 3  
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.  
Customer Service............................................................... 3  
Table of Contents............................................................... 3  
Introduction ....................................................................... 4  
Performance Features ........................................................ 4  
Dimensions ....................................................................... 5  
Installation ........................................................................ 6  
Side Panel Cooling and Connections ................................ 7  
How to Connect for Four Channels ................................... 8  
How to Connect for Three Channels ................................. 9  
How to Connect for Two Channels ................................. 10  
How to Connect with Subwoofer Channel ...................... 11  
Top Panel Controls, Displays and Switches .................... 12  
How to Operate................................................................ 13  
How to Operate in Four or Three Channel Mode............ 14  
How to Operate in Two Channel or Subwoofer Mode .... 15  
How to Replace the Fuses ............................................... 16  
Block Diagram................................................................. 17  
Specifications .................................................................. 18  
Packing Instruction .......................................................... 19  
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  
General Notes  
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:  
1. An optional McIntosh External Subwoofer Rotary Control,  
Model Number R1163, is available from your McIntosh  
Dealer.  
2. Do not connect the Amplifiers Speaker Negative Terminal  
Connection directly to the Vehicle Chassis. Failure to observe  
this could result in damage to your Amplifier.  
3. It is advisable to place an inline fuse as close as possible to  
the battery.  
4. For additional connection information, refer to the owners  
manual(s) for any component(s) connected to the MCC204  
Amplifier.  
5. There is a built-in turn on delay which will mute the speaker  
outputs for approximately two seconds when the amplifier is  
turned on.  
McIntosh Laboratory, Inc.  
2 Chambers Street  
Binghamton, New York 13903  
Phone: 607-723-1545  
Fax: 607-723-3636  
Customer Service  
6. It is very important that loudspeaker cables of adequate size  
be used in your music system, to ensure that there will be no  
power loss or heating. If your loudspeaker cables are 25 feet  
(7.62m) or less, use at least 16 Gauge wire size or larger.  
7. The MCC204 Line Level OUTPUTs are wired as a “Y”  
connection with the INPUTs to pass the input signals on to  
additional amplifiers (keep cable lengths as short as  
possible). The McIntosh MX406 Control Center is capable of  
driving several additional  
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.  
For assistance on factory repair return procedure, contact  
the McIntosh Repair Department at:  
McIntosh Laboratory, Inc.  
2 Chambers Street  
Binghamton, New York 13903  
Phone: 607-723-3515  
Fax: 607-723-1917  
(-) NEGATIVE SPEAKER OUTPUT  
power amplifiers with no  
degradation of the signal.  
8. The MCC204 can accept  
speaker level inputs at its Input  
Jacks. Refer to the diagram for  
Copyright 2001 ã by McIntosh Laboratory, Inc.  
(+) POSITIVE SPEAKER OUTPUT  
connection.  
3
Introduction  
Now you can take advantage of traditional McIntosh stan-  
dards of excellence in the MCC204 Power Amplifier. Four  
50 watt high current output channels will drive any high  
quality loudspeaker system to its ultimate performance.  
The MCC204 reproduction is sonically transparent and ab-  
solutely accurate. The McIntosh Sound is “The Sound of  
the Music Itself.”  
· Thermal Protection with Multi-Speed Cooling Fan  
Built-in thermal protection circuits guard against overheat-  
ing which could shorten the normal long life expectancy of  
your McIntosh Power Amplifier. Cooling fan speed is con-  
trolled by temperature sensors attached to the interior of  
the extruded aluminum cooling tunnel. The fan is normally  
off. When needed, the fan will automatically switch on,  
and speed is increased as needed for additional cooling.  
Performance Features  
· Fully Discrete Design  
· Power Output  
The MCC204 has a fully complimentary double balanced  
amplifier design and is identical to that found in  
McIntosh’s leading home amplifiers.  
The MCC204 consists of four separate power amplifier  
channels, each capable of 50 watts into 4 ohm speakers  
with less than 0.005% distortion.  
· Balanced Inputs with Pass Through  
· Four Bridgeable Channels  
The Balanced Inputs cancel out interference noise that is  
produced by other sources in the vehicle and can be di-  
rectly connected to the bridged speaker output of any head  
unit. The MCC204 provides four line level outputs, for the  
convenience of connecting multi-amplifier systems.  
The MCC204 includes four 50 watt amplifier channels.  
Each pair of channels can be set in bridged configuration  
for 200 watts output into 4 ohm loudspeakers with less  
than 0.01% distortion.  
· High Current Output  
· Remote Subwoofer Control and Line Output  
The subwoofer level can be controlled via an external ro-  
tary control, which can be remotely mounted in the vehicle.  
A line level summed output is provided to drive an external  
subwoofer power amplifier. The inputs to both channels are  
summed for this output.  
A peak output current of 15 amperes ensures that the  
MCC204 will successfully drive high quality loudspeakers,  
such as McIntosh, for a truly exciting sound experience.  
· Equalizer and Variable Crossover Filters  
The one band equalizer has a center frequency that is vari-  
able from 40 Hz to 2,000 Hz which can be either cut or  
boosted ±12db. 12dB per octave high pass filters with vari-  
able corner frequencies from 50Hz to 120Hz and 12dB per  
octave low pass filters with variable corner frequencies  
from 50Hz to 120Hz.  
· Gold Plated Terminals  
McIntosh provides gold plated input and output terminals  
on the amplifiers for superior corrosion resistance. It is a  
very important feature in the automotive environment.  
Speaker wires to 10 AWG and DC input wires to 4 AWG  
can be accommodated.  
· Power Guard and Sentry Monitor  
All 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. McIntosh Sentry  
Monitor power output stage protection circuits are present  
on all channels to ensure the MCC204 will have a long and  
trouble free operating life.  
· Speaker Protection  
If for any reason, a DC (Direct Current) voltage appears at  
the speaker output terminals, a built-in circuit turns off the  
amplifier power supplies to prevent damage to your valu-  
able loudspeakers.  
4
Dimensions  
Dimensions  
The following dimensions can assist in determining the  
best location for your MCC204. There is additional infor-  
mation on the next page pertaining to installing the  
MCC204 into your vehicle.  
5
Installation  
Installation  
It is recommended that a professional who is skilled in all  
aspects of installation and operation install the MCC204  
and any associated mobile audio equipment.  
Amplifier Ventilation  
Always provide adequate ventilation for the MCC204. The  
amplifier requires an adequate airflow into the cooling fan,  
which is located on the left side of the amplifier. The warm  
air exits the amplifier through vents on the heatsinks. See  
figure 1. Be sure to provide at least 1-1/2 inches clearance  
in front of the cooling fan and 1 inch clearance at the sides  
of the heatsinks.  
The cooling fan is controlled by temperature sensors,  
attached to the interior of the tunnel. The fan is normally  
off. If the program material contains sustained loud pas-  
sages demanding high power, the fan will turn-on to in-  
crease cooling. If cooling is still not sufficient, additional  
heating will shut down the amplifier’s internal power sup-  
ply completely and the Power Guard LEDs will light. The  
fan will continue to run and once normal temperatures are  
restored, operation will resume.  
The amplifier can be mounted vertically or horizontally  
and may be located under a seat if adequate clearance is  
available. The preferred installation method is to mount the  
amplifier directly to the vehicle frame using the hardware  
supplied with the amplifier.  
It is not recommended that the amplifier be mounted  
under the hood or in a location where it will be directly ex-  
posed to the elements. The openings in the fan housing and  
heat tunnel vents can allow internal components to be dam-  
aged by exposure to water, chemicals or any form of road  
dust or debris.  
Removing the Glass Panel  
To access the MCC204 Controls, remove the glass panel  
by removing the four hex bolts with the supplied 3/32” hex  
key. See figure 2. Attach the supplied suction cup to the top  
center of the glass panel and carefully raise it high enough  
to put your hand under. Temporarily place the removed  
glass panel in a safe place, remove the suction cup and  
save it for future use.  
Removing the End Caps  
To access the MCC204 Connecting Terminal Blocks, re-  
move the Glass Panel first (the above step) and then re-  
move the Phillips Screws holding the End Caps on both  
sides of the amplifier and lift the end caps off. See figure 3.  
6
Side Panel Cooling and Connections  
Connect to the Negative (-)  
vehicle battery terminal  
Connect to the positve (+)  
vehicle battery terminal  
with an inline fuse  
Cooling Fan  
Air Intake  
SUBWOOFER OUTPUTS  
supply a four channel  
summed output  
Receives the Amplifier  
Turn-ON signal from a  
McIntosh Control Center  
OUTPUTs from the  
INPUT Signal Source  
to connect to another  
Power Amplifier  
OUTPUT Connections  
for loudspeakers  
INPUTs for  
audio cables  
from a signal  
source  
OUTPUT Connections  
for loudspeakers  
Connector for optional  
Controls the Power Guard  
SUBwoofer REMOTE  
Volume CONTROL  
Circuit when connected to  
certain McIntosh Control  
Centers  
7
How to Connect for Four Channels  
How to Connect for Four Channels  
Note: The Subwoofer Output Signal is at line-level,  
summed from all the Input Channels and is  
available regardless of the MCC204 Operating  
Mode used. The Subwoofer Output Level can be  
remotely controlled by the optional McIntosh  
External Subwoofer Rotary Control connected to  
the SUB REMOTE CONTROL jack on the  
MCC204.  
1. Connect a wire from the Control Center Amp On to the  
MCC204 ON Connector on the right side of the ampli-  
fier.  
Note: All cables should be connected to the amplifier  
before connecting the DC power cables to the  
battery.  
2. Connect a wire from a McIntosh Control Center with  
Power Guard to the MCC204 PG Connector on the  
right side of the amplifier.  
3. Connect cables (up to 12AWG) from four separate  
loudspeakers, to the Amplifier’s Channels 1, 2, 3 and 4  
OUTPUT Terminals, being careful to observe the cor-  
rect polarities.  
6. Connect the MCC204 to the vehicle battery terminals  
using size 4AWG (maximum) cables.  
Note: It is advisable to place an inline fuse of a suitable  
size as close as possible to the battery.  
4. Connect audio cables from the Control Center Outputs  
to the MCC204 Inputs 1, 2, 3 and 4.  
5. Optional Connection illustrated below shows the SUB  
OUTput connected to a separate Subwoofer Power  
Amplifier and Subwoofer Loudspeaker.  
Subwoofer  
Loudspeaker  
McIntosh Control Center  
Optional Subwoofer Amplifier  
Left Rear  
Right Rear  
Power Guard  
Amp ON  
Left Front  
Right Front  
Right Rear  
Loudspeakers  
Left Front  
Loudspeakers  
McIntosh External  
Subwoofer Rotary Control  
Right Front  
Loudspeakers  
Left Rear  
Loudspeakers  
-
+
Vehicle  
Battery  
Fuse  
8
How to Connect for Three Channels  
How to Connect for Three Channels  
1. Connect a wire from the Control Center Amp On to the  
MCC204 ON connector on the right side of the ampli-  
fier.  
5. Connect speaker cables from one woofer to the  
Amplifier’s Channels 3 and 4 BRIDGED OUTPUT  
Terminals, being careful to observe the correct polari-  
ties.  
6. Connect an audio cable from one of the control center  
outputs to the input of an external crossover.  
7. Connect an audio cable from the external crossover  
TWEETER output to the MCC204 Channel 1 Input.  
8. Connect an audio cable from the external crossover  
MID-RANGE output to the MCC204 Channel 2 Input.  
9. Connect an audio cable from the external crossover  
WOOFER output to the MCC204 Channel 3 Input.  
Note: Do not connect a cable to the MCC204 Channel 4  
Input.  
Note: All cables should be connected to the amplifier  
before connecting the DC power cables to the  
battery.  
2. Connect a wire from a McIntosh Control Center with  
Power Guard to the MCC204 PG connector on the  
right side of the amplifier.  
3. Connect speaker cables (up to 12AWG) from a tweeter  
to the Amplifier’s Channel 1 OUTPUT Terminals be-  
ing careful to observe the correct polarities.  
4. Connect speaker cables from a mid-range loudspeaker  
to the Amplifiers’ Channel 2 OUTPUT Terminals, be-  
ing careful to observe the correct polarities.  
Note: The connecting information shown here is for a  
single channel of an audio system. For the other  
channel, connect a second MCC204 and  
10. Connect the MCC204 to the vehicle battery terminals  
using size 4AWG (maximum) cables.  
Note: It is advisable to place an inline fuse of a suitable  
size as close as possible to the battery.  
loudspeakers in a similar manner.  
McIntosh Control Center  
McIntosh Electronic Crossover  
Left Output  
Power Guard  
Amp ON  
Tweeter  
Loudspeaker  
Woofer  
Loudspeaker  
Midrange  
Loudspeaker  
-
+
Vehicle  
Battery  
Fuse  
9
How to Connect for Two Channels  
How to Connect for Two Channels  
Note: The Subwoofer Output Signal is at line-level,  
summed from all the Input Channels and is  
available regardless of the MCC204 Operating  
Mode used. The Subwoofer Output Level can be  
remotely controlled by the optional McIntosh  
External Subwoofer Rotary Control connected to  
the SUB REMOTE CONTROL jack on the  
MCC204.  
1. Connect a wire from the Control Center Amp On to  
the MCC204 ON Connector on the right side of the  
amplifier.  
Note: All cables should be connected to the amplifier  
before connecting the DC power cables to the  
battery.  
2. Connect a wire from a McIntosh Control Center with  
Power Guard to the MCC204 PG Connector on the  
right side of the amplifier.  
3. Connect cables (up to 12AWG) from two separate  
loudspeakers, one to the Amplifier Bridged Channels 1  
and 2 OUTPUT Terminals, and one to Bridged Chan-  
nels 3 and 4 OUTPUT Terminals, being careful to ob-  
serve the correct polarities.  
6. Connect the MCC204 to the vehicle battery terminals  
using size 4AWG (Maximum) cables.  
Note: It is advisable to place an inline fuse of a suitable  
size as close as possible to the battery.  
4. Connect audio cables from the Control Center Outputs  
to the MCC204 Inputs 1 and 3.  
5. Optional Connection illustrated below shows the SUB  
OUTput connected to a separate Subwoofer Power  
Amplifier and Subwoofer Loudspeaker.  
Subwoofer  
Loudspeaker  
Optional connections for  
controlling the Subwoofer  
Level by using the Front to  
Rear Fader Control on the  
Control Center  
McIntosh Control Center  
Optional Subwoofer Amplifier  
Left Rear  
Right Rear  
Power Guard  
Amp ON  
Left Front  
Right Front  
McIntosh External  
Subwoofer Rotary Control  
Left Loudspeakers  
Right Loudspeakers  
-
+
Vehicle  
Battery  
Fuse  
10  
How to Connect with Subwoofer Channel  
How to Connect with Subwoofer Channel  
Note: The Subwoofer Output Signal is at line-level,  
summed from all the Input Channels and is  
available regardless of the MCC204 Operating  
Mode used. The Subwoofer Output Level can be  
remotely controlled by the optional McIntosh  
External Subwoofer Rotary Control connected to  
the SUB REMOTE CONTROL jack on the  
MCC204.  
1. Connect a wire from the Control Center Amp On to  
the MCC204 ON Connector on the right side of the  
amplifier.  
Note: All cables should be connected to the amplifier  
before connecting the DC power cables to the  
battery.  
2. Connect a wire from a McIntosh Control Center with  
Power Guard to the MCC204 PG Connector on the  
right side of the amplifier.  
3. Connect cables (up to 12AWG) from two separate up-  
per range loudspeakers, to the Amplifier’s Channels 1  
and 2 OUTPUT Terminals, and subwoofer loud-  
speaker to Channels 3 and 4 BRIDGED OUTPUT Ter-  
minals, being careful to observe the correct polarities.  
4. Connect audio cables from the Control Center Outputs  
to the MCC204 Inputs 1 and 2.  
5. Connect the MCC204 to the vehicle battery terminals  
using size 4AWG (Maximum) cables.  
Note: It is advisable to place an inline fuse of a suitable  
size as close as possible to the battery.  
Optional connections for  
controlling the Subwoofer  
Level by using the Front to  
Rear Fader Control on the  
Control Center  
McIntosh Control Center  
Left Rear  
Right Rear  
Power Guard  
Amp ON  
Left Front  
Right Front  
Left Loudspeakers  
McIntosh External  
Subwoofer Rotary Control  
Subwoofer  
Loudspeaker  
Right Loudspeakers  
-
+
Vehicle  
Battery  
Fuse  
11  
Top Panel Controls, Display and Switches  
POWER GUARD LED  
CROSSOVER Filter  
Switch and Control se-  
lect the low roll-off fre-  
quency, high roll-off  
frequency or flat fre-  
quency response  
CH 3-4 EQUALIZER Con-  
lights when the Power  
Guard Circuit activates  
for Amplifier Channels  
3 or 4  
trols select the Frequency and  
the Level of Boost or Cut at  
the Center Frequencies  
POWER  
CH 3-4 MODE Switch  
selects STEREO or  
BRIDGE mode of  
operation  
CH 3-4 SENSITIVITY  
Individual Input Sensi-  
tivity Controls for  
INPUT  
SOURCE  
GUARD LED  
lights when the  
Power Guard  
Circuit acti-  
vates for Am-  
plifier Channels  
1 or 2  
Switch for  
Channels 3, 4  
selects either  
CHs 1, 2, or  
3, 4 or  
Subwoofer  
(Sum of CHs  
1, 2, 3, and 4)  
Channels 3 and 4  
CH 1-2 MODE Switch  
selects STEREO or  
BRIDGE mode of  
operation  
CH 1-2 SENSITIVITY  
Individual Input Sensitivity  
Controls for Channels 1  
and 2  
CROSSOVER Filter  
Switch and Control se-  
lect the low roll-off fre-  
quency, high roll-off  
frequency or flat fre-  
quency response  
CH 1-2 EQUALIZER Con-  
trols select the Frequency and  
the Level of Boost or Cut at  
the center frequencies  
12  
How to Operate  
Introduction  
Input Sensitivity Controls  
The McIntosh MCC204 is a highly versatile amplifier that  
can be configured in many ways. This manual gives ex-  
amples of some of the most common configurations. The  
best way to set equalization and filter controls is through  
the use of a real-time spectrum analyzer and the expertise  
of a professional installer. This manual will guide you  
through the basic operation, however we suggest you refer  
to your dealer for further information on the use of this  
unit. To access the Amplifier Controls and Switches refer  
to “Removing the Glass Panel” located on page 6 of this  
Owner’s Manual.  
The SENSITIVITY controls allows the setting of the input  
sensitivity, of all four amplifier channels, to provide an  
ideal match for the signal source be-  
ing used. The most desirable setting  
allows the control center to have a  
useful volume range as wide as pos-  
sible from loud to soft. A good place  
to start is to set the amplifier’s SEN-  
SITIVITY Control to the output volt-  
Figure 6  
age called out in your control center  
owner’s manual. The Level controls can be set for any sen-  
sitivity from .5 volts to 8 volts.  
Crossover  
Refer to figure 6.  
The CROSSOVER Switch OUT Position selects a Flat Fre-  
quency Response. When the CROSSOVER Switch is in  
the LP (low frequency pass) Po-  
sition, the Amplifier will pass all  
frequencies below the setting of  
the CROSSOVER FRE-  
Note: When used in conjunction with a McIntosh Control  
Center, you may find setting the Sensitivity controls to  
the center detent (1.5V) works best.  
QUENCY Control. If the  
CROSSOVER Switch is in the  
HP (high frequency pass) Posi-  
tion, the Amplifier will pass all  
Figure 4  
frequencies above the setting of the CROSSOVER FRE-  
QUENCY Control. Refer to figure 4.  
Equalizer  
Each of the two pairs of channels (1 and 2, 3 and 4) is  
equipped with an equalizer. The equalizer is not intended to  
act as a tone control. The one-band equalizer is best uti-  
lized as a notch filter to reduce a  
peak (as located by real-time analy-  
sis with an RTA) in your system’s  
frequency response. If you are at-  
tempting to equalize a system with-  
out RTA data, play music you are  
familiar with, set the equalizer  
Figure 5  
LEVEL Control to +12 and slowly turn the FREQUENCY  
Control to get an idea where in the musical spectrum the  
frequency numbers are located. Then set the LEVEL Con-  
trol back to 0 and listen to the system to determine its  
equalization needs. Subtle adjustments are best and cutting  
usually sounds better than boosting. Refer to figure 5.  
13  
How to Operate in Four or Three Channel Mode  
How to Operate Three Channel Mode  
How to Operate Four Channel Mode  
In the Four Channel Mode, all channels operate as inde-  
pendent 50 watt amplifiers. A typical four channel applica-  
tion is to drive a pair of full range loudspeakers in the front  
section of a vehicle and a second pair in the rear. Refer to  
figures 7 and 8.  
In the Three Channel, Tri-amp Mode, channel 1 operates as  
a 50 watt amplifier for the tweeter, channel 2 operates as a  
50 watt amplifier for the mid-range and bridged channels 3  
and 4 operate as a 200 watt amplifier driving a woofer. Re-  
fer to figures 7 and 8.  
Power  
Power  
The MCC204 will turn On or Off when the Control Center  
The MCC204 will turn On or Off when the control center  
turns On or Off.  
turns On or Off.  
Note: There must be an Amp ON connection between the  
MCC204 and the signal source unit in order for the  
amplifier power turn On and Off to function.  
Note: There must be an Amp ON connection between the  
MCC204 and the signal source in order for the  
amplifier turn On and Off to function.  
Input Source  
Input Source  
Set the Input SOURCE Switch to the 3, 4 position for 4  
Channel Mode.  
Set the Input SOURCE Switch to 3, 4.  
Sensitivity Controls  
Sensitivity Controls  
The Sensitivity Controls allow setting of the input level of  
The Sensitivity Controls allow setting the input level of  
amplifier channels 1, 2 and 3 to provide an ideal match for  
all four amplifier channels to provide an ideal match for the the signal source being used. Sensitivity Control 3 adjusts  
signal source being used.  
the woofer level balance and Sensitivity Control 4 has no  
effect.  
Mode  
Set both MODE Switches to the STereo position to config-  
ure the amplifier for four channel operation.  
Mode  
Set the Channels 1-2 MODE Switch to the STereo position.  
Set the Channels 3-4 output MODE Switch to the BRidged  
position.  
Crossover  
Set the CROSSOVER Switches to the OUT position since  
all channels are operating at full frequency range.  
Crossover  
Set the CROSSOVER Switches to the OUT position since  
all channels are operating at full frequency range.  
Figure 7  
Figure 8  
14  
How to Operate in Two Channel or Subwoofer Mode  
How to Operate in Subwoofer Mode  
How to Operate in Two Channel Mode  
In the Two Channel Mode, Channels 1 and 2, and Channels In the Sub Woofer Mode, Channels 1 and 2 operate as in-  
3 and 4 operate in bridged configuration as a pair of full  
frequency range 200 watt amplifiers. A typical application  
dependent 50 watt amplifiers, driving two midrange and  
high frequency or full range speakers. Channels 3 and 4  
is use of a more powerful amplifier for stereo reproduction. operate in Bridged Mode as a single 200-watt amplifier,  
Refer to figures 7 and 8.  
driving a low frequency speaker. A typical Subwoofer Ap-  
plication is to drive two upper-range loudspeakers and one  
woofer or subwoofer. Refer to figures 7 and 8.  
.
Power  
The MCC204 will turn On or Off when the Control Center  
turns On or Off.  
Power  
Note: There must be an Amp ON connection between the  
MCC204 and the signal source unit in order for the  
amplifier power turn On and Off to function.  
The MCC204 will turn On or Off when the Control Center  
turns On or Off.  
Note: There must be an Amp ON connection between the  
MCC204 and the signal source unit in order for the  
amplifier power turn On and Off to function.  
Input Source  
Set the Channel 3-4 SOURCE Switch to 3, 4.  
Input Source  
Sensitivity Controls  
Set the Channel 3-4 SOURCE Switch to the 1-4 (SUB) po-  
sition to send the summed signals from Input 1 and 2 to the  
Bridged Channels 3 and 4 for low-pass filtering.  
The Sensitivity Controls 1 and 3 allow the setting of input  
level of both bridged pairs of amplifier channels to provide  
an ideal match for the signal source being used.  
Sensitivity Controls  
Mode  
The Sensitivity Controls allow setting the input level of  
Amplifier Channels 1, 2 and 3 to provide an ideal match  
for the signal source being used. Sensitivity Control 3 ad-  
justs the subwoofer level balance and Sensitivity Control 4  
has no effect.  
Set both the Channel 1-2 MODE Switch and the Channel  
3-4 MODE Switch to the BRidged position to configure  
the amplifier for two channel operation.  
Crossover  
Set the CROSSOVER Switches to the OUT position since  
both bridged channels are operating at full frequency  
range.  
Output Mode  
Set the Channels 1-2 MODE Switch to the STereo position  
and the Channels 3-4 MODE Switch to the BRidged posi-  
tion to operate in the Subwoofer Mode.  
Crossover  
Set the Channel 1-2 CROSSOVER Switch to the HP Posi-  
tion and the Channel 3-4 CROSSOVER Switch to the LP  
Position. Adjust the CROSSOVER FREQUENCY Control  
for both Channels 1-2 and 3-4 to the same frequency set-  
ting. The selection of the Crossover Frequency should be  
determined by the recommendations of the Loudspeaker  
Manufacturer for the best performance.  
15  
How to Replace the Fuses  
How to Replace the Fuses  
If the MCC204 produces no sound, there is no Illumination  
of the Nomenclature on the Top Glass Panel, and the power  
connections seem secure, one or more of the Amplifier’s  
Fuse(s) may have failed. Under normal operating  
conditions your amplifier’s fuses should not fail. Failure of  
a fuse is usually an indication of a problem. Replacing the  
fuse, if there is a problem in the amplifier, may incur a risk  
of further damage. Refer to figures 9, 10 and 11.  
Caution: Disconnect the Amplifier from the Vehicle Battery  
(or DC Power Supply) as Potentially Dangerous  
Currents exist inside the amplifier.  
1. Before accessing fuses, disconnect both the positive  
and negative power cables from the DC input  
terminals on the left side of the amplifier using a  
5/32” hex key.  
2. Remove the Top Glass Panel by first removing the  
four hex bolts with the supplied 3/32” hex key.  
3. To remove the Top Glass Panel, attach the supplied  
suction cup to the top center of the glass panel and  
carefully raise it high enough to put your hand under.  
Temporarily place the removed glass panel in a safe  
place, remove the suction cup and save it for future  
use.  
4. Remove the Phillips Screws holding the End Caps on  
both sides of the amplifier and lift the end caps off.  
5. Remove the two Phillips Screws located between the  
row of Controls/Switches and the Top/Bottom edge  
of the Gold Faceplate Control Panel.  
6. Remove all 10 crossover, equalizer and sensitivity  
knobs.  
7. Remove the Gold Faceplate Control Panel.  
8. Remove the fuses with needle nose pliers, taking care  
to avoid hitting parts on the ciruit board.  
Note: To determine if the fuse has failed, examine the  
link between the two fuse legs to see if it has a  
break in it.  
9. Replace the fuse with one of the same type and  
rating, as unauthorized substitutions may prove  
hazardous to you and the amplifier.  
10. When reinserting the fuse, set it in place with the  
pliers, then push it the rest of the way in with your  
finger to avoid having the pliers slip and hit the  
circuit board.  
11. Re-install the Gold Faceplate Control Panel and all  
10 crossover, equalizer and sensitivity knobs.  
12. Re-connect the power cables to the vehicle battery.  
If the replacement fuse(s) fails again, have the amplifier  
repaired at a McIntosh Service Center.  
16  
MCC204 Block Diagram  
Specifications  
Specifications  
Power Output Per Channel  
Intermodulation Distortion  
50 watts into 4 ohm loads and 100 watts into 2 ohm loads  
is the minimum sine wave continuous average power out-  
put per channel all four channels operating.  
Maximum Intermodulation Distortion if instanta-  
neous peak output per channel does not exceed  
twice the rated output, for any combination of fre-  
quencies from 20Hz to 20,000Hz, with all channels  
operating is:  
Power Output Bridged  
200 watts into 4 ohm loads is the minimum sine wave con-  
tinuous average power output.  
0.005% for 4 ohm loads  
0.01% for 2 ohm loads  
0.01% for Bridged Mode with 4 ohm loads  
Rated Power Band  
20Hz to 20,000Hz  
Input Impedance  
12,000 ohms  
Total Harmonic Distortion  
Maximum Total Harmonic Distortion at any power  
level from 250 milliwatts to rated power output is:  
0.005% for 4 ohm loads  
Power Requirements  
12 Volts DC, 2.5 amps (idle) - 38 amps (50 watts)  
Dimensions  
0.01% for 2 ohm loads  
12.5 inches (31.8cm) wide, 3.0 inches (7.6cm)  
high, 13.7 inches (34.8cm) depth  
0.01% for Bridged Mode with 4 ohm loads  
Dymanic Headroom  
1dB  
Weight  
14.5 pounds (6.6Kg) net, 17.0 pounds (7.7Kg) in  
shipping carton  
Frequency Response  
+0, -0.25dB from 20Hz to 20,000Hz  
+0, -3dB from 10Hz to 100,000Hz  
Sensitivity  
0.5 Volts  
A-Weighted Signal To Noise Ratio  
105dB (1.5V)  
One Band Equalizer  
Center Frequency is variable from 40Hz to 2,000Hz, level  
variable ±12db, Q fixed at 2  
Crossover  
Selectable High pass or Low pass. The frequency is vari-  
able from 50Hz to 120Hz. The slope is 12dB per octave  
(Low pass is 24dB per octave in bridged mode)  
Subwoofer Output  
Low Pass filtered at 200Hz with a 6db per octave slope  
(level variable ±12db when using optional McIntosh Exter-  
nal Subwoofer Rotary Control)  
18  
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, failure to do so will result in shipping damage.  
Make sure that the Top Glass Panel is firmly secured to the  
chassis using the supplied hex head screws.  
Quantity Part Number  
Description  
Shipping carton only  
End cap (Foam pad)  
1
2
034162  
034132  
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.  
19  
McIntosh Laboratory, Inc.  
2 Chambers Street  
Binghamton, NY 13903  
McIntosh Part No. 040765  

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