Owner’s
Manual
MCC404/MCC404M Power Amplifier
MCC404
MCC404M
McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 FAX: 607-724-0549
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McIntosh MCC404 Amplifier
Thank You
Your decision to own this McIntosh MCC404/MCC404M
Four Channel Power Amplifier ranks you at the very top
among discriminating music listeners. You now have “The
Best.” The McIntosh dedication to “Quality,” is assurance
that you will receive many years of musical enjoyment
from this unit.
The McIntosh MCC404 Power Amplifier is identical to the
McIntosh MCC404M illustrated throughout this manual in
every aspect except the MCC404 is without the Power Out-
put Meters.
Please take a short time to read the information in this
manual. We want you to be as familiar as possible with all
the features and functions of your new McIntosh.
Please Take A Moment
The serial number, purchase date and McIntosh dealer
name are important to you for possible insurance claim or
future service. The spaces below have been provided for
you to record that information:
Serial Number:
Purchase Date:
Dealer Name:
Technical Assistance
If at any time you have questions about your McIntosh
product, contact your McIntosh dealer who is familiar with
your McIntosh equipment and any other brands that may
be part of your system. If you or your dealer wish addi-
tional help concerning a suspected problem, you can re-
ceive technical assistance for all McIntosh products at:
McIntosh Laboratory, Inc.
2 Chambers Street
Binghamton, New York 13903
Phone: 607-723-1545
Fax: 607-723-3636
Customer Service
If it is determined that your McIntosh product is in need of
repair, you can return it to your dealer. You can also return
it to the McIntosh Laboratory Service 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
Copyright 2000 ã by McIntosh Laboratory, Inc.
3
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Table of Contents
Introduction
Safety Instructions ............................................................. 2
Thank You.......................................................................... 3
Please Take a Moment ....................................................... 3
Customer Service............................................................... 3
Table of Contents............................................................... 4
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 Channels .................... 11
Top Panel Controls, Displays and Switches .................... 12
Now you can take advantage of traditional McIntosh stan-
dards of excellence in the MCC404/MCC404M power am-
plifier. Four 100 watt high current output channels will
drive any high quality loudspeaker system to its ultimate
performance. The MCC404/MCC404M reproduction is
sonically transparent and absolutely accurate. The McIn-
tosh Sound is “The Sound of the Music Itself.”
Performance Features
· Power Output
The MCC404/MCC404M consists of four separate power
amplifier channels, each capable of 100 watts into 4ohm
speakers with less than 0.005% distortion.
How to Operate the MC404/MC404M............................ 13 · Four Bridgeable Channels
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
The MCC404/MCC404M includes four 100 watt amplifier
channels. Each pair of channels can be set in bridged con-
figuration for 400 watts output into 4 ohm loudspeakers
with less than 0.007% distortion.
· High Current Output
A peak output current of 20 amperes ensures that the
MCC404/MCC404M will successfully drive high quality
loudspeakers, such as McIntosh, for a truly exciting sound
experience.
General Notes
1. An optional McIntosh External Subwoofer Rotary Control,
Model Number R1163, is available from your McIntosh
Dealer.
2. Do not connect the Amplifier Speaker Negative Terminal
Connection directly to the Vehicle Chassis. Failure to observe
this could result in damage to your Amplifier.
3. For additional connection information, refer to the owner’s
manual(s) for any component(s) connected to the MCC404/
MCC404M Amplifier.
4. There is a built-in turn on delay which will mute the speaker
outputs for approximately two seconds when the amplifier is
turned on.
· Equalizer and Variable Crossover Filters
The one band equalizer has a center frequency that is vari-
able from 40 Hz to 2,000 Hz that can be either cut or
boosted ±12db. 12dB per octave high pass filters with vari-
able corner frequencies from 5Hz to 5,000Hz and 12dB per
octave low pass filters with variable corner frequencies
from 50Hz to 5,000Hz.
5. 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.
6. It is advisable to place an in-line fuse as close as possible to
the battery.
· 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 MCC404/MCC404M will
have a long and trouble free operating life.
7. The MCC404/MCC404M 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
(-) NEGATIVE SPEAKER OUTPUT
power amplifiers with no
· Speaker Protection
degradation of the signal.
8. The MCC404M/MCC404 can
accept speaker level inputs at
its Input Jacks. Refer to the
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.
(+) POSITIVE SPEAKER OUTPUT
diagram for connection.
4
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Dimensions
Dimensions
The following dimensions can assist in determining the
best location for your MCC404/MCC404M. There is addi-
tional information on the next page pertaining to installing
the MCC404/MCC404M into your vehicle.
5
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Installation
Installation
It is recommended that a professional who is skilled in all
aspects of installation and operation install the MCC404/
MCC404M and any associated mobile audio equipment.
Amplifier Ventilation
Always provide adequate ventilation for the MCC404/
MCC404M. The amplifier requires an adequate airflow
into the cooling fans, which are 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 fans and
1 inch clearance at the sides of the heatsinks.
The cooling fans are controlled by temperature sensors,
attached to the interior of the tunnel. The fans are normally
off. If the program material contains sustained loud pas-
sages demanding high power, the fans will turn-on to in-
crease cooling. If cooling is still not sufficient, additional
heating will shut down the amplifier internal power supply
completely and the Power Guard LEDs will light. The fans
will continue to run and once normal temperatures are re-
stored, 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 main frame using the hard-
ware 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 housings
and heat tunnel vents can allow internal components to be
damaged by exposure to water, chemicals or any form of
road dust or debris.
Removing the Glass Panel
To access the MCC404/MCC404M Controls, remove the
glass panel by removing the four hex bolts with the sup-
plied 3/32” hex key. See figure 2. Attach the supplied suc-
tion 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 MCC404/MCC404M Connecting Terminal
Blocks, remove the Glass Panel first (the above step) and
then remove the Phillips Screws holding the End Caps on
both sides of the amplifier and lift the end caps off. See fig-
ure 3.
6
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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
Cooling Fan
Air Intake
SUBWOOFER OUTPUTS
supplies 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 the an-
other Power Amplifier
OUTPUT Connections
for 2, 4 or 8 ohm loud-
speakers
INPUTs for
audio cables
from a signal
source
OUTPUT Connections
for 2, 4 or 8 ohm loud-
speakers
Connector for optional
Controls the Power Guard
Subwoofer Remote
Volume Control
Circuit when connected to
certain McIntosh Control
Centers
7
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How to Connect for Four Channels
How to Connect for Four Channels
Note: The Subwoofer Outputs are line-level outputs and
summed from all the Input Channels. They can be
remotely controlled by connecting a cable from the SUB
REMOTE CONTROL jack to the optional external
rotary control.
6. Optional Connection allows the SUB REMOTE CON-
TROL to be connected to the Power Amplifier, regard-
less of the MCC404/MCC404M Operating Mode used.
7. Connect the MCC404/MCC404M to the vehicle bat-
tery terminals using size 4 AWG (Maximum) cables.
Note: It is advisable to place an in-line fuse of a suitable size
as close as possible to the battery.
1. Connect the cable from the Control Center Amp On to
the MCC404/MCC404M 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 cable from a McIntosh Control Center with
Power Guard to the MCC404/MCC404M PG Connec-
tor 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
Terminals, being careful to observe the correct polari-
ties.
4. Connect audio cables from the Control Center Outputs
to the MCC404/MCC404M Inputs 1, 2, 3 and 4.
5. Optional Connection allows the SUB Outputs to be
connected to a separate Subwoofer Power Amplifier,
regardless of the MCC404/MCC404M Operating
Mode used.
Subwoofer
Loudspeaker
Right Rear Output
Left Rear Output
McIntosh Control Center
Left Front Output
Right Front Output
Optional Subwoofer Amplifier
Right Rear
Loudspeaker
Right Front
Loudspeaker
-
+
Vehicle
Battery
Fuse
Left Rear
Loudspeaker
Left Front
Loudspeaker
8
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How to Connect for Three Channels
How to Connect for Three Channels
1.Connect the AMP ON wire from the Control Center
Amp ON to the MCC404/MCC404M ON connector
on the side of the amplifier.
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 MCC404/MCC404M channel
1 input.
Note: All cables should be connected to the amplifier before
connecting the DC power cables to the battery.
2.Connect a cable from a McIntosh Control Center with
Power Guard to the MCC404/MCC404M PG connec-
tor on the side of the amplifier.
8. Connect an audio cable from the external crossover
MID-RANGE output to the MCC404/MCC404M
channel 2 input.
3. Connect speaker cables (up to 12AWG) from a tweeter
to the amplifier’s channel 1 output terminals.
4. Connect speaker cables from a mid-range loudspeaker
to the amplifier’s channel 2 output terminals, being
careful to observe the correct polarities.
9. Connect an audio cable from the external crossover
WOOFER output to the MCC404/MCC404M channel
3 input.
Note: Do not connect a cable to the MCC404/MCC404M
channel 4 input.
Note: The connecting information shown here is for a single
channel of an audio system. For the other channel,
connect a second MCC404/MCC404M and
10. Connect the MCC404/MCC404M to the vehicle bat-
tery terminals using size 4 AWG (Maximum) cables.
Note: It is advisable to place an in-line fuse of a suitable size
as close as possible to the battery.
loudspeakers in a similar manner.
5. Connect speaker cables from one woofer to the
amplifier’s channels 3&4 BRIDGED output terminals,
being careful to observe the correct polarities.
Left Output
McIntosh Control Center
McIntosh Electronic Crossover
Tweeter
Loudspeaker
Woofer
Loudspeaker
-
+
Vehicle
Battery
Fuse
Midrange
Loudspeaker
9
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How to Connect for Two Channels
How to Connect for Two Channels
Note: The Subwoofer Outputs are line-level outputs and
summed from all the Input Channels. They can be
remotely controlled by connecting a cable from the SUB
REMOTE CONTROL jack to the optional external
rotary control.
6. Optional Connection allows the SUB REMOTE CON-
TROL to be connected to the Power Amplifier, regard-
less of the MCC404/MCC404M Operating Mode used.
7. Connect the MCC404/MCC404M to the vehicle bat-
tery terminals using size 4 AWG (Maximum) cables.
Note: It is advisable to place an in-line fuse of a suitable size
as close as possible to the battery.
1. Connect the cable from the Control Center Amp On to
the MCC404/MCC404M 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 cable from a McIntosh Control Center with
Power Guard to the MCC404/MCC404M PG Connec-
tor 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 Terminals, and one to Bridged Channels 3 and 4
Terminals, being careful to observe the correct polari-
ties.
4. Connect audio cables from the Control Center Outputs
to the MCC404/MCC404M Inputs 1 and 3.
5. Optional Connection allows the SUB Outputs to be
connected to a separate Subwoofer Power Amplifier,
regardless of the MCC404/MCC404M Operating
Mode used.
Optional connections for
controlling the Subwoofer
Level by using the Front to
Rear Fader Control on the
Control Center
Subwoofer
Loudspeaker
McIntosh Control Center
Right Output
Optional Subwoofer Amplifier
Left Output
-
+
Vehicle
Battery
Fuse
Left
Loudspeaker
Left Rear
Loudspeaker
10
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How to Connect with Subwoofer Channel
How to Connect with Subwoofer Channel
Note: The Subwoofer Outputs are line-level outputs and
summed from all the Input Channels. They can be
remotely controlled by connecting a cable from the SUB
REMOTE CONTROL jack to the optional external
rotary control.
6. Optional Connection allows the SUB REMOTE CON-
TROL to be connected to the Power Amplifier, regard-
less of the MCC404/MCC404M Operating Mode used.
7. Connect the MCC404/MCC404M to the vehicle bat-
tery terminals using size 4 AWG (Maximum) cables.
Note: It is advisable to place an in-line fuse of a suitable size
as close as possible to the battery.
1. Connect the cable from the Control Center Amp On to
the MCC404/MCC404M 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 cable from a McIntosh Control Center with
Power Guard to the MCC404/MCC404M PG Connec-
tor on the right side of the amplifier.
3. Connect cables (up to 12AWG) from two separate up-
per range loudspeakers, to the Amplifiers’ Channels 1
and 2 Terminals, and subwoofer loudspeaker to
Bridged Channels 3 and 4 Terminals, being careful to
observe the correct polarities.
4. Connect audio cables from the Control Center Outputs
to the MCC404/MCC404M Inputs 1 and 2.
5. Optional Connection allows the SUB Outputs to be
connected to a separate Subwoofer Power Amplifier,
regardless of the MCC404/MCC404M Operating
Mode used.
Optional connections for
controlling the Subwoofer
Level by using the Front to
Rear Fader Control on the
Control Center
McIntosh Control Center
Left Output
Right Output
Left Loudspeaker
-
+
Vehicle
Battery
Fuse
SubWoofer
Loudspeaker
Right Loudspeaker
11
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Top Panel Controls, Display and Switches
CH 3-4 SENSITIVITY
Individual Input Sensitiv-
ity Controls for Channels
3 and 4
CH 3/4 LOW PASS
Filter Switch and Con-
trol selects the high
roll-off frequency or
flat frequency response
CH 3/4 EQUALIZER Con-
trols select the Frequency and
the Level of Boost or Cut at
the Center Frequencies
CH 3/4 HIGH PASS Filter
POWER GUARD LED
lights when the Power
Guard Circuit activates
for Amplifier Channels
3 or 4
CH 3/4 MODE Switch
selects STEREO or
BRIDGE mode of
operation
Switch and Control select
the low frequency roll-off
rate or flat frequency re-
sponse
INPUT
POWER
SOURCE
Switch for
Channels
3&4 selects
either CHs
1&2, 3&4 or
Subwoofer
(Sum of CHs
1, 2, 3, & 4)
GUARD LED
lights when the
Power Guard
Circuit acti-
vates for Am-
plifier Channels
1 or 2
METER
indicates
Channels
1 and 2
Power
METER
indicates
Channels
3 and 4
Power
Output
Output
CH 1/2 MODE Switch
selects STEREO or
BRIDGE mode of
operation
CH 1/2 HIGH PASS Filter
Switch and Control select
the low roll-off frequency
response
CH 1-2 SENSITIVITY
Individual Input Sensitivity
Controls for Channels 1
and 2
CH 1/2 LOW PASS Filter
Switch and Control select
the high roll-off frequency
response
CH 1/2 EQUALIZER Con-
trols select the Frequency and
the Level of Boost or Cut at
the center frequencies
12
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How to Operate the MCC404/MCC404M
Introduction
spectrum the frequency numbers are located.
Then set the LEVEL control back to 0 and
listen to the system to determine its equaliza-
tion needs. Subtle adjustments are best and
cutting usually sounds better than boosting.
Refer to figure 6.
The McIntosh MCC404/MCC404M is a highly versatile
amplifier that can be configured in many ways. This
manual gives examples of some of the most common con-
figurations. The best way to set equalization and filter con-
trols 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 Owners Manual.
Figure 6
Input Sensitivity Controls
The SENSITIVITY controls allows the setting of the input
sensitivity, of all four amplifier channels, to provide an
ideal match for the signal source being used. The most de-
sirable setting allows the control center to have a useful
volume range as wide as possible from loud to soft. A good
place to start is to set the amplifier’s SEN-
SITIVITY Control to the output voltage
called out in your control center owner’s
manual. The Level controls can be set for
any sensitivity from .5 volts to 8 volts.
Low Pass Filter
The LOW PASS Filter Controls select the center frequen-
cies at which the filters operate for all four amplifier chan-
nels. Any given frequency number is selected through the
combined settings of the FREQUENCY and
MULTIPLIER controls. The low-pass filters
multiplier switches have settings of X1 (fre-
Figure 7
Refer to figure 7.
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 times one), X10 (frequency times
ten). Refer to figure 4.
Example: A frequency 1,500 Hz would be attained by setting the
FREQUENCY Control to 150 and setting the
MULTIPLIER Switch to X10 (150 times 10 equals
1,500).
Figure 4
Power Output Meters (MCC404M only)
There are two illuminated watt meters on the glass panel,
one displaying combined power output for channels 1&2
and one displaying combined power output for channels
3&4. The upper scale
shows power in watts
during normal operation,
the lower scale displays
power in watts for
High Pass Filter
The HIGH PASS Filter Controls select the center frequen-
cies at which the filters operate. Any given frequency num-
ber is selected through the combined settings of the FRE-
QUENCY and MULTIPLIER controls. The
high-pass filter multiplier switches have set-
tings of X.1 (frequency times one-tenth), X1
bridged operation. All
displays show power into
a 4 ohm load. The meters
(frequency times one), X10 (frequency
times ten). Refer to figure 5.
Figure 5
Figure 8
Example: A frequency of 15 Hz would be selected by setting the
FREQUENCY Control to 150 and the MULTIPLIER
Switch to X.1 (150 times .1 equals 15).
respond to all the musical information being produced by
the amplifier. They indicate to an accuracy of at least 95%
of the power output with only a single cycle of a 2000Hz
tone burst. Refer to figure 8.
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 analysis with an RTA) in your system’s frequency re-
sponse. If you are attempting to equalize a system without
RTA data, play music you are familiar with, set the equal-
izer LEVEL control to +12 and slowly turn the FRE-
QUENCY control to get a feel for where in the musical
13
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How to Operate in Four or Three Channel Mode
How to Operate Three Channel Mode
How to Operate Four Channel Mode
In the 4 Channel Operating Mode, all channels operate as
independent 100 watt amplifiers. A typical four channel
application is to drive a pair full range loudspeakers in the
front section of a vehicle and a second pair in the rear. Re-
fer to figures 9 and 10.
In the Three Channel, Tri-amp Mode, channel 1 operates as
a 100 watt amplifier for the tweeter, channel 2 operates as a
100 watt amplifier for the mid-range and bridged channels
3&4 operate as a 400 watt amplifier driving a woofer.
Power
Power
The MCC404/MCC404M will turn on or off when the con-
The MCC404/MCC404M will turn on or off when the
Control Center turns On or Off.
trol center turns On or Off.
Note: There must be an Amp ON connection between the
MCC404/MCC404M and the signal source in order for
the amplifier turn On and Off to function.
Note: There must be an Amp ON connection between the
MCC404/MCC404M and the signal source unit in order
for the amplifier power turn On and Off to function.
Input Source
Input Source
Set the Channel 3-4 INPUT SOURCE Switch to 3, 4.
Set the Channel 3&4 INPUT SOURCE Switch to the 3, 4
position for 4 Channel Mode.
Sensitivity Controls
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 adjusts
Sensitivity Controls
The Sensitivity Controls allow setting of the input level of
all four amplifier channels to provide an ideal match for the the woofer level balance and Sensitivity Control 4 has no
signal source being used.
effect.
Output Mode
Output Mode
Set both OUTPUT MODE Switches to the STEREO posi-
tion to configure the amplifier for 4 channel operation.
Set the Channels 1-2 OUTPUT MODE Switch to the STE-
REO position. Set the Channels 3-4 OUTPUT MODE
Switch to the BRIDGED position.
High Pass Filter
Set the High Pass Filters’ Frequency Controls to 50 and the High Pass Filter
MULTIPLIER Switch to X.1. This will pass the full au-
dible spectrum yet filter out power-robbing sub-sonics be-
low 5 Hz.
Set both the High Pass Filters’ FREQUENCY Controls to
50 and the MULTIPLIER Switches to X.1.
Low Pass Filter
Low Pass Filter
Set the Low Pass Filter Switches to OUT.
Set the Low Pass Filter Switches to the OUT position since
both channels are operating at full frequency range.
Figure 9
Figure 10
14
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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 3 In the Sub Woofer Operating Mode, channels 1&2 operate
and 4 operate in bridged configuration as a pair of full fre-
quency range 400 watt amplifiers. A typical application is
use of a more powerful amplifier for stereo reproduction.
Refer to figures 9 and 10.
as independent 100 watt amplifiers, driving two midrange
and high frequency or full range speakers. Channels 3&4
operate in Bridged Mode as a single 400-watt amplifier,
driving a low frequency speaker. A typical Sub application
is to drive two upper-range loudspeakers and one woofer or
subwoofer. Refer to figures 9 and 10.
Power
The MCC404/MCC404M will turn on or off when the
.
Control Center turns On or Off.
Power
Note: There must be an Amp ON connection between the
MCC404/MCC404M and the signal source unit in order
for the amplifier power turn On and Off to function.
The MCC404/MCC404M will turn On or Off when the
Control Center turns on or off.
Note: There must be an Amp ON connection between the
MCC404/MCC404M and the signal source unit in order
for the amplifier power turn On and Off to function.
Input Source
Set the channel 3-4 INPUT SOURCE Switch to 3, 4.
Input Source
Sensitivity Controls
Set the channel 3&4 INPUT SOURCE Switch to the 1-4
(SUB) position to send the summed signals from input 1&2
to the bridged channels 3&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
Output 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 adjusts
the subwoofer level balance and Sensitivity Control 4 has
no effect.
Set both the channel 1-2 OUTPUT MODE Switch and the
channel 3-4 OUTPUT MODE Switch to the BRIDGED
position to configure the amplifier for two channel opera-
tion.
High Pass Filter
Output Mode
Set the High Pass Filters’ Frequency Controls to 50 and the Set the channels 1-2 OUTPUT MODE Switch to the STE-
MULTIPLIER Switch to X.1. This will pass the full au-
dible spectrum yet filter out power robbing sub-sonics be-
low 5 Hz.
REO position and the channels 3-4 OUTPUT MODE
Switch to the BRIDGED position to operate in the three
channel bi-amp mode.
Low Pass Filter
High Pass Filter
Set the Low Pass Filter Switches to the OUT position since Set the channel 3-4 High Pass Filters’ FREQUENCY Con-
both channels are operating at full frequency range.
trol to 50 and the MULTIPLIER Switch to X.1. Set the
channel 1-2 High Pass filter Frequency Controls the fre-
quency above which you wish to send to the upper range
speakers.
Example: To send frequencies above 200Hz to the upper range
speakers, the FREQUENCY Control to 200 and the
MULTIPLIER Switch to X1.
Low Pass Filter
Set the channel 1-2 low pass filter to OUT. Set the channel
3-4 Low Pass Filter controls to the frequency below which
you wish to send to the subwoofer.
Example: To send frequencies below 200Hz to the subwoofer,
set the FREQUENCY Control to 200 and the
MULTIPLIER Switch to X1.
15
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How to Replace the Fuses
How to Replace the Fuses
If the MCC404/MCC404M 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 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 problem in the amplifier, may incur a risk
of further damage. Refer to figures 11, 12 and 13.
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
low and high pass filter controls.
6. Remove all 12 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 the wattmeter during removal. Do not
lever the pliers against the wattmeter.
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 12
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
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MCC404/MCC404M Block Diagram
17
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Specifications
Specifications
Power Output Per Channel
Intermodulation Distortion
100 watts into 4 ohm loads and 200 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
400 watts into 4 ohm loads is the minimum sine wave con-
tinuous average power output.
0.005% for 4 ohm loads
0.007% for 2 ohm loads
0.007% 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, 3.5 amps (idle) - 70 amps (100 watts)
Dimensions
0.007% for 2 ohm loads
12.25 inches (31.1 cm) wide, 3.0 inches (7.6 cm)
high, 18.4 inches (46.7cm) depth
0.007% for Bridged Mode with 4 ohm loads
Dymanic Headroom
1dB
Weight
20.2 pounds (9.2 Kg) net, 23.2 pounds (10.5 Kg)
in shipping carton
Frequency Response
+0, -0.25dB from 20Hz to 20,000Hz
+0, -3dB from 10Hz to 50,000Hz
Sensitivity
0.5Volts
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
High Pass Filter
Variable from 5Hz to 5,000Hz, 12 db per octave
Low Pass Filter
Variable from 50Hz to 5,000Hz, 12 db per octave (24 db
per octave in Bridged Mode)
Subwoofer Output
Low Pass filtered at 200 Hz with a 6db per octave slope
(level variable ±12db when using optional McIntosh Exter-
nal Subwoofer Rotary Control)
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Packing Instructions
Packing Instructions
In the event it is necessary to repack the equipment for
shipment, the equipment must be packed exactly as shown
below, 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
033775
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
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McIntosh Laboratory, Inc.
2 Chambers Street
Binghamton, NY 13903
McIntosh Part No. 040709
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