McIntosh M Q112 User manual

McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 www.mcintoshlabs.com
M Q 112M Q 112
ENVIRONMENTAL EQUALIZER
OWNER’S MANUAL
MQ112 OM COVER RGB 10in 20230814
MQ112 OM COVER K 10in 20230814

2
General Information
1. For additional connection information, refer to the
owner’s manual(s) for any component(s) connected
to the MQ112.
2. The Main AC Power going to the MQ112 and
any other McIntosh component(s) should not
be applied until all the system components are
connected together. Failure to do so could result
in malfunctioning of some or all of the system’s
normal operations.
3. When the MQ112 is in its remote standby
is actively waiting to receive a remote control
command via the unit’s power control in jack.
4. For additional information on the MQ112 and
other McIntosh products please visit the McIntosh
website at www.mcintoshlabs.com.
Thank You from all of us at McIntosh
You have invested in a precision instrument that
will provide you with many years of enjoyment.
Please take a few moments to familiarize yourself
with the features and instructions to get the
maximum performance from your equipment.
If you need further technical assistance, please
contact your dealer who may be more familiar with
your particular setup including other brands. You
can also contact McIntosh with additional questions
or in the unlikely event of needing service.
McIntosh Laboratory, Inc.
2 Chambers Street
Binghamton, New York 13903
Technical Assistance (607) 723-3512
Fax (607) 724-0549
Customer Service (607) 723-3515
Fax (607) 723-1917
Email support@mcintoshlabs.com
Website www.mcintoshlabs.com
Introduction
The MQ112 Environmental Equalizer is an
elegant instrument for adding customized sound
reproduction to your audio system. The MQ112
uses the latest in technology to quickly restore
proper musical balance in a minimum amount of
time.
Safety First
Please read the safety instructions included in a
separate document called Important Additional
Operation Information Guide.
Table of Contents
Thank You from all of us at McIntosh .. .. .. .. 2
Please Take A Moment .. .. .. .. .. .. .. .. .. .. 2
Introduction . .. .. .. .. .. .. .. .. .. .. .. .. .. .. 2
General Information .. .. .. .. .. .. .. .. .. .. .. 2
Safety First .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 2
Installation .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 3
Connector Information .. .. .. .. .. .. .. .. .. .. 3
Performance Features.. .. .. .. .. .. .. .. .. .. .. 3
Front Panel Displays and Switches. .. .. .. .. .. 4
Equalizer Controls .. .. .. .. .. .. .. .. .. .. .. .. 5
Rear Panel Connections and Switches .. .. .. .. 6
Connection Diagram Option 1 .. .. .. .. .. .. .. 7
Connection Diagram Option 2 .. .. .. .. .. .. .. 8
Dimensions .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. 9
Audio Specifications .. .. .. .. .. .. .. .. .. .. ..10
General Specifications. .. .. .. .. .. .. .. .. .. ..10
Packing Instructions .. .. .. .. .. .. .. .. .. .. ..11
Part List .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. ..11
Please Take A Moment
For future reference, you can write down your
serial number and purchase information here. We
can identify your purchase from this information
if the occasion should arise:
Serial Number: __________________________
Purchase Date:___________________________
Dealer Name: ___________________________

3
MQ112
Performance Features
• User Preferred Equalization
The MQ112 uses the latest in technology to
restore musical balance to audio systems located
in rooms with less than ideal acoustics.
• Multiple Outputs
The MQ112 has two sets of unbalanced and
stereo or mono to provide convenient connection
of a powered subwoofer.
• Power Control
The power control input connection provides
MQ112 when connected to a McIntosh system.
• External EQ Control
The EQ circuit in the MQ112 can be switched
in or out using the front panel knob or by using
the rear panel EQ control trigger. The EQ
control trigger can be connected to a McIntosh
the EQ circuit switches in or out depending on the
• Solid State Front Panel Illumination
The even illumination of the glass front panel
features long life Light Emitting Diodes (LEDs).
This provides even front panel illumination and
is designed to ensure the pristine beauty of the
MQ112 will be retained for many years.
Installation
The MQ112 should be installed upright on its four
feet. Adequate ventilation is important and will aid
in a long trouble-free life of the MQ112. You must
(7.6cm) above the unit and 3 inches (7.6cm) for the
front, rear and sides. Do not remove the feet to
must be openings for cool air to enter (below) and
warm air to escape (above) the MQ112. To aid in
choosing the best location to install the MQ112,
refer to Dimensions on page 9.
Connector Information
XLR Input Connectors
Meter/Tube
Illumination
Control
Power
Control
Ground
XLR Output Connectors
Power Control Connectors
Signal Ground
RCA Connectors
(+) Signal Ground
(-) Signal
21
3
(-) Signal
12
3(+) SignalGround
XLR INPUT
XLR OUTPUT
(+) Signal Ground
(-) Signal
21
3
(-) Signal
12
3(+) SignalGround
XLR INPUT
XLR OUTPUT

4
Front Panel Displays and Switches
2. TILT Knob works around a centered frequency
point or tilt frequency. When turned counter-
clockwise, the tilt control works by boosting
all the signals below the tilt frequency (bass
signals) while attenuating all signals above the tilt
frequency (treble signals). When turned clockwise,
the tilt control boosts all frequencies above the tilt
frequency and attenuates all frequencies below the
tilt frequency. Refer to Tilt Control on page 5.
1. EQ CONTROL Knob allows the user to select
whether or not the equalizer circuit is engaged. In
the OUT mode the front panel adjustment knobs
are bypassed and the audio signal is unaltered. In
the IN mode the audio signal can be adjusted via
the front panel TILT and frequency knobs. In the
TRIG mode the EQ can be triggered IN or OUT
using the rear panel EQ CONTROL trigger.
3. Eight Band Equalizer Knobs allow the user
to boost or cut any individual frequency or any
combination of frequencies. Refer to Frequency
Controls on page 5.
4. POWER Knob turns the unit ON / OFF or
places the unit in REMOTE mode when set up in
conjunction with the unit’s power control IN port
to receive ON or OFF commands from other audio
units.

5
MQ112
Equalizer Controls
Frequency Controls
Tilt Control
FULL COUNTER CLOCKWISE POSITION
FULL CLOCKWISE POSITION
The MQ112 has eight frequency controls which will raise or lower by 12 dB,
the amplitude of the band of frequencies centered at the frequency marked
above the controls. The center frequencies of these controls are at 25Hz, 50Hz,
100Hz, 200Hz, 400Hz, 1kHz, 3kHz and 10kHz. Both left and right channels
SOPRANO
CONTRALTO
TENOR
BARITONE
BASS
PICCOLO
FLUTE
OBOE
ENGLISH HORN
B CLARINET
BASS CLARINET
ALTO SAXOPHONE IN B
BASSOON
CONTRABASSOON
B TRUMPET
FRENCH HORN IN F
TENOR TROMBONE
BASS TROMBONE IN F
TUBA
MEDIUM
SMALL
LARGE
HARP
GUITAR
VIOLIN
VIOLA
CELLO
BASS
PIANO
STRINGS
KETTLE DRUMS
BRASS
WOODWINDS
SINGING VOICE
50Hz 200Hz 1kHz 10kHz
25Hz 100Hz 400Hz 2.5kHz
3kHz

6
Rear Panel Connections and Switches
Connect to AC Outlet
2. POWER CONTROL
McIntosh component when the front panel
POWER knob is set to REMOTE.
McIntosh component.
3. EQ CONTROL receives an IN / OUT
command from another McIntosh component
when the front panel EQ CONTROL knob is set
to TRIG.
1. AUTO OFF when set to ENABLE, the unit will
power itself down if no audio signal is present
at the input for at least 30 minutes. When set to
DISABLE, the unit will remain on until manually
When the front panel POWER knob is set to
REMOTE, the AUTO OFF function is automati-
cally disabled.
4. OUTPUT 2
BALANCED and UNBALANCED connections
MODE selects between left and right STEREO
and MONO audio modes for OUTPUT 2.
5. OUTPUT 1 BALANCED and UNBALANCED
-
sor loop input.
6. INPUT for BALANCED and UNBALANCED
connections from audio sources.

7
MQ112
BAL R BAL L
UNBAL
PREAMPLIFIER
POWER AMPLIFIER
Connection Diagram Option 1 (Using the MQ112 Between a Preamp and Power Amp)

8
BAL R BAL L
UNBAL
PROCESSOR LOOP
SEND RETURN
Connection Diagram Option 2 (Using the MQ112 in a Processor Loop)
PREAMPLIFIER
POWER AMPLIFIER

9
MQ112
Dimensions
The following dimensions can assist in determining the best location for your MQ112.
17 ⁄”
44.5 cm
3⁄”
10 cm
15 ⁄”
39.8 cm
14 ⁄”
37 cm
3 ⁄”
9 cm
10 ⁄”
26.8 cm
17 ⁄”
43.3 cm
13 ⁄”
33.7 cm
3 /”
8.3 cm
1⁄”
4.9 cm

10
Audio Specications
Rated Output Voltage
2.5V Unbalanced
5V Balanced
Maximum Output Voltage
10V Unbalanced
20V Balanced
Maximum Input Voltage
10V Unbalanced
20V Balanced
Voltage Gain (all controls at)
Unbalanced IN to OUT 0dB
Balanced IN to OUT 0dB
Frequency Response (all controls at)
+0, -0.5dB from 20Hz to 20,000Hz
+0, -1dB from 10Hz to 100,000Hz
Signal to Noise Ratio (A-Weighted)
115dB (below rated output)
Total Harmonic Distortion
0.005% from 20Hz to 20,000Hz
Input Impedance
10k ohms Unbalanced
20k ohms Balanced
Output Impedance
500 ohms Unbalanced
1000 ohms Balanced
Equalizer Controls
±12dB at 25Hz, 50Hz, 100Hz, 200Hz, 400Hz,
1kHz, 3kHz, and 10kHz
Tilt Control
±6dB at 20Hz and 20kHz
650Hz Tilt Axis
General Specications
Power Control Input
5-15VDC, less than 1mA
Power Control Output
12VDC, 25mA
Power Requirements
Field AC Voltage conversion of the MQ112 is not
possible. The MQ112 is factory congured for
one of the following AC Voltages:
100 Volts, 50/60Hz at 30 watts
110 Volts, 50/60Hz at 30 watts
120 Volts, 50/60Hz at 30 watts
220 Volts, 50/60Hz at 30 watts
230 Volts, 50/60Hz at 30 watts
240 Volts, 50/60Hz at 30 watts
Standby Power, less than 0.5 watts
Overall Dimensions
Weight
15 pounds (6.8 kg) net
29.5 pounds (13.4 kg) in shipping carton
Shipping Carton Dimensions

11
MQ112
Packing Instructions Part List
Qty Part Number Description
1 033838 Shipping Carton
2 034669 End Caps
1 033836 Inside Carton
1 033725 Top Pad
1 034576 Bottom Pad
1 034547 Bottom Pad Filler
4 017937 Plastic Feet
4 404080 #10 Flat Washers
In the event it is necessary to repack the equip-
ment for shipment, the equipment must be packed
exactly as shown below.
It is very important that the four plastic feet
are attached to the bottom of the equipment.
This will ensure the proper equipment location
on the bottom pad. Failure to do this will result
in shipping damage.
Use the original shipping carton and interior parts
only if they are all in good serviceable condition.
If a shipping carton or any of the interior part(s)
are needed, please call or write Customer Service
Department of McIntosh Laboratory. Refer to
page 2. Please see the Part List for the correct part
numbers.
TOP PAD
UNIT WITH
(4) FEET ON
BOTTOM COVER
PLASTIC
FOOT (4)
10-32 X 3/4”
SCREW WITH
WASHER (4)
BOTTOM PAD
BOTTOM PAD
FILLER
INSIDE
CARTON
IMPORTANT
(READ ABOVE)
END CAPS
SHIPPING
CARTON

The continuous improvement of its products is the
policy of McIntosh Laboratory, Inc. who reserve
the right to improve design without notice.
Printed in the U.S.A.
McIntosh Laboratory, Inc.
2 Chambers Street
Binghamton, NY 13903
www.mcintoshlabs.com
© 2023 McIntosh Laboratory, Inc.
McIntosh Part No. 24120000
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