HPA M1224FX User manual

Owner’s Manual
M1224FX
M1424
M1624FX
M1824
MONOMONOMONO AUX
RETURN
CHANNEL 1
STEREO RETURN
AUX/EFX SEND
TAPE IN PHONES/CTRL-R
CH
1
TAPE IN REC OUT
ALT 3/4 OUTPUTFOOT SWITCH
MAIN OUTPUT
CONTROL ROOM
LINE
INSERT
1
MIC
ALT 3/4
MAIN
TAPE IN
PHANTOM POWER POWER
PROGRAM
SELECT
OUT IN
TRIM
PEAK
AUX
EFX
010
5
PRE/POST
PFL
+10
5
0
5
10
15
20
30
40
CHANNEL 2
CH
2
LINE
INSERT
2
MIC
MF
2.5kHz
HF
12kHz
LF
80Hz
PFL
+10
5
0
5
10
15
20
30
40
CHANNEL 3
CH
3
LINE
INSERT
3
MIC
PFL
+10
5
0
5
10
15
20
30
40
CHANNEL 4
CH
4
LINE
INSERT
4
MIC
PFL
+10
5
0
5
10
15
20
30
40
CHANNEL 5/6
CH
5/6
LINE 5
LINE 6
5/6
MIC
PFL
+10
5
0
5
10
15
20
30
40
CHANNEL 7/8
CH
7/8
LINE 7
LINE 8
7/8
LINE 9
LINE 10
LINE 9
LINE 10
LINE 11
LINE 12
9/10
MIC
LINE 11
LINE 12
11/12
PFL
+10
5
0
5
10
15
20
30
40
CHANNEL 9/10
CH
9/10
PFL
+10
5
0
5
10
15
20
30
40
CHANNEL 11/12
CH
11/12
PFL
+10
5
0
5
10
15
20
30
40
EFX RTN
EFX
PFL
+10
5
0
5
10
15
20
30
40
ALT 3/4
TO MAIN L/R
+10
5
0
5
10
15
20
30
40
+10
5
0
5
10
15
20
30
40
ON
OFF
-20
-10
-7
-4
-2
0
+2
+4
+7
CLIP
AUX
EFX
HEADPHONE
-30+14
-6 -50
30
-15 +15
0
-12 +12
0
-15 +15
0
010
5
PAN
LR
TRIM
PEAK
AUX
EFX
010
5
PRE/POST
MF
2.5kHz
HF
12kHz
LF
80Hz
-30+14
-6 -50
30
-15 +15
0
-12 +12
0
-15 +15
0
010
5
PAN
LR
TRIM
PEAK
AUX
EFX
010
5
PRE/POST
MF
2.5kHz
HF
12kHz
LF
80Hz
-30+14
-6 -50
30
-15 +15
0
-12 +12
0
-15 +15
0
010
5
PAN
LR
TRIM
PEAK
AUX
EFX
010
5
PRE/POST
MF
2.5kHz
HF
12kHz
LF
80Hz
-30+14
-6 -50
30
-15 +15
0
-12 +12
0
-15 +15
0
010
5
PAN
LR
TRIM
PEAK
AUX
EFX
010
5
PRE/POST
MF
2.5kHz
HF
12kHz
LF
80Hz
-20+20
-10 -50
30
-15 +15
0
-12 +12
0
-15 +15
0
010
5
BALANCE
LR
TRIM
PEAK
AUX
EFX
010
5
PRE/POST
MF
2.5kHz
HF
12kHz
LF
80Hz
-20+20
-10 -50
30
-15 +15
0
-12 +12
0
-15 +15
0
010
5
BALANCE
LR
AUX
EFX
010
5
PRE/POST
MF
2.5kHz
HF
12kHz
LF
80Hz
-15 +15
0
-12 +12
0
-15 +15
0
010
5
BALANCE
LR
AUX
EFX
010
5
PRE/POST
MF
2.5kHz
HF
12kHz
LF
80Hz
-15 +15
0
-12 +12
0
-15 +15
0
010
5
AUX
010
5
AUX
010
5
MAIN
010
5
EFX
010
5
LEVEL
010
5LEVEL
010
5
AUX
010
5
BALANCE
LR
PERFORMANCE
HALL REVERB
PLATE REVERB
SPRING REVERB
ECHO
FLANGE+VERB
CHORUS+VERB
ECHO+VERB
CHORUS
FLANGE
PFL
12 CH MIXING CONSOLE
M1224FX HPA
75Hz 75Hz 75Hz 75Hz 75Hz 75Hz
L/ALT3 R/ALT4
MAIN L/R
MUTE
ALT 3/4
MUTE
ALT 3/4
MUTE
ALT 3/4
MUTE
ALT 3/4
MUTE
ALT 3/4
MUTE
ALT 3/4
MUTE
ALT 3/4
MUTE
ALT 3/4 ON
Professional Stereo Compact Mixer

WARNING

1
M1224FX / M1424 / M1624FX / M1824
Introductions ...................................................................................... 2
Features .............................................................................................. 3
Front Panel ........................................................................................ 4
Input Section .......................................................................... 4
Master Section ....................................................................... 6
Input/Output Section Connectors ..................................... 8
Rear Panel ...................................................................................... 10
Point to Remember ......................................................................... 11
Connections ..................................................................................... 12
Applications ................................................................................... 13
Block Diagram ............................................................................... 15
Specifications ................................................................................ 16
General Specifications ......................................................... 16
Input/Output Specifications ............................................... 17
Service ............................................................................................... 18
Procedures ............................................................................. 18
Schematic .............................................................................. 18
Parts List ................................................................................. 18
Table of Contents
Table of Contents

2
M1224FX / M1424 / M1624FX / M1824
Introduction
Welcome
Thank you for purchasing M 4-Bus SERIES Mixing Console. The M 4-Bus Series provides an
excellent balance of operability, functionally and ease of use. In order to take full advantage of
the M 4-Bus Series capabilities and enjoy years of trouble - free use, please read this manual
carefully.
Unpacking
Although it is neither complicated to install nor difficult to operate your set, a few minutes of your
time is required to read this manual for a properly wired installation and becoming familiar with
its many features and how to use them. Please take a great care in unpacking your set and do
not discard the carton and other packing materials. They may be needed when moving your set
and are required if it ever becomes necessary to return your set for service. Never place the unit
near radiators, in front of heating vents, to direct sun light, in excessive humid or dusty location
to avoid early damage and for your years of quality entertainment. Connect your complementary
components as illustrated in the following pages.
MONOMONOMONO AUX
RETURN
CHANNEL 1
STEREO RETURN
AUX/EFX SEND
TAPE IN PHONES/CTRL-R
CH
1
TAPE IN REC OUT
ALT 3/4 OUTPUTFOOT SWITCH
MAIN OUTPUT
CONTROL ROOM
LINE
INSERT
1
MIC
ALT 3/4
MAIN
TAPE IN
PHANTOM POWER POWER
PROGRAM
SELECT
OUT IN
TRIM
PEAK
AUX
EFX
010
5
PRE/POST
PFL
+10
5
0
5
10
15
20
30
40
CHANNEL 2
CH
2
LINE
INSERT
2
MIC
MF
2.5kHz
HF
12kHz
LF
80Hz
PFL
+10
5
0
5
10
15
20
30
40
CHANNEL 3
CH
3
LINE
INSERT
3
MIC
PFL
+10
5
0
5
10
15
20
30
40
CHANNEL 4
CH
4
LINE
INSERT
4
MIC
PFL
+10
5
0
5
10
15
20
30
40
CHANNEL 5/6
CH
5/6
LINE 5
LINE 6
5/6
MIC
PFL
+10
5
0
5
10
15
20
30
40
CHANNEL 7/8
CH
7/8
LINE 7
LINE 8
7/8
LINE 9
LINE 10
LINE 9
LINE 10
LINE 11
LINE 12
9/10
MIC
LINE 11
LINE 12
11/12
PFL
+10
5
0
5
10
15
20
30
40
CHANNEL 9/10
CH
9/10
PFL
+10
5
0
5
10
15
20
30
40
CHANNEL 11/12
CH
11/12
PFL
+10
5
0
5
10
15
20
30
40
EFX RTN
EFX
PFL
+10
5
0
5
10
15
20
30
40
ALT 3/4
TO MAIN L/R
+10
5
0
5
10
15
20
30
40
+10
5
0
5
10
15
20
30
40
ON
OFF
-20
-10
-7
-4
-2
0
+2
+4
+7
CLIP
AUX
EFX
HEADPHONE
-30+14
-6 -50
30
-15 +15
0
-12 +12
0
-15 +15
0
010
5
PAN
LR
TRIM
PEAK
AUX
EFX
010
5
PRE/POST
MF
2.5kHz
HF
12kHz
LF
80Hz
-30+14
-6 -50
30
-15 +15
0
-12 +12
0
-15 +15
0
010
5
PAN
LR
TRIM
PEAK
AUX
EFX
010
5
PRE/POST
MF
2.5kHz
HF
12kHz
LF
80Hz
-30+14
-6 -50
30
-15 +15
0
-12 +12
0
-15 +15
0
010
5
PAN
LR
TRIM
PEAK
AUX
EFX
010
5
PRE/POST
MF
2.5kHz
HF
12kHz
LF
80Hz
-30+14
-6 -50
30
-15 +15
0
-12 +12
0
-15 +15
0
010
5
PAN
LR
TRIM
PEAK
AUX
EFX
010
5
PRE/POST
MF
2.5kHz
HF
12kHz
LF
80Hz
-20+20
-10 -50
30
-15 +15
0
-12 +12
0
-15 +15
0
010
5
BALANCE
LR
TRIM
PEAK
AUX
EFX
010
5
PRE/POST
MF
2.5kHz
HF
12kHz
LF
80Hz
-20+20
-10 -50
30
-15 +15
0
-12 +12
0
-15 +15
0
010
5
BALANCE
LR
AUX
EFX
010
5
PRE/POST
MF
2.5kHz
HF
12kHz
LF
80Hz
-15 +15
0
-12 +12
0
-15 +15
0
010
5
BALANCE
LR
AUX
EFX
010
5
PRE/POST
MF
2.5kHz
HF
12kHz
LF
80Hz
-15 +15
0
-12 +12
0
-15 +15
0
010
5
AUX
010
5
AUX
010
5
MAIN
010
5
EFX
010
5
LEVEL
010
5LEVEL
010
5
AUX
010
5
BALANCE
LR
PERFORMANCE
HALL REVERB
PLATE REVERB
SPRING REVERB
ECHO
FLANGE+VERB
CHORUS+VERB
ECHO+VERB
CHORUS
FLANGE
PFL
12 CH MIXING CONSOLE
M1224FX HPA
75Hz 75Hz 75Hz 75Hz 75Hz 75Hz
L/ALT3 R/ALT4
MAIN L/R
MUTE
ALT 3/4
MUTE
ALT 3/4
MUTE
ALT 3/4
MUTE
ALT 3/4
MUTE
ALT 3/4
MUTE
ALT 3/4
MUTE
ALT 3/4
MUTE
ALT 3/4 ON
M1224FX/M1424/M1624FX/M1824
Professional Stereo Compact Mixer
Introductions

3
M1224FX / M1424 / M1624FX / M1824
Features
Features
-4 MONO(M1224FX/M1424),8 MONO(M1624FX/M1824) INPUT AND 4 STEREO(M1224FX/
M1624FX), 5STEREO(M1424/1824)INPUT
Any sound source of microphones, cassette decks, electronic guitars, organs can be applied to
the channel input.
- 4 MONO(M1224FX/M1424),8 MONO(M1624FX/M1824) CHANNEL INSERT
- MAIN L/R AND ALT 3/4 OUTPUT
Main L/R and ALT 3/4 are provided for convenient use.
- AUX RETURN AND 2 AUX SEND
For convenient use of external equipment, AUX SEND and AUX RETURN function are provided.
- CHANNEL EQUALIZER
The 3 band equalizer are designed for ±15dB(HF,LF), ±12dB(MF) control on input channel.
- PFL FUNCTION OF ALL CHs
The PFL function allows you to monitor any input channel before the channel fader through
headphone outputs and control room outputs .
- DSP FUNCTION : 100 SELECTABLE PRESETS (ONLY M1224FX/M1624FX)
A built-in 24bit DSP(Digital Signal Processor ) with 100 selectable presets including Reverb,
Delay and Chorus, offers dazzling studio quality effects..
- FOOT SWITCH (ONLY M1224FX/M1624FX)
- PHANTOM POWER(+48V)
Phantom power is provided for easy connection of condenser microphones requiring an external
power supply.
- RACK MOUNTING
Detachable rack ears for mounting in a standard 19” rack enclosure.
- EXTERNAL AC POWER

4
M1224FX / M1424 / M1624FX / M1824 Front Panels
CHANNEL 8
CH
8
PFL
+10
5
0
5
10
15
20
30
40
CHANNEL 11/12
CH
11/12
PFL
+10
5
0
5
10
15
20
30
40
CHANNEL 13/14
CH
13/14
PFL
+10
5
0
5
10
15
20
30
40
TRIM
PEAK
AUX
EFX
010
5
PRE/POST
MF
2.5kHz
HF
12kHz
LF
80Hz
-30+14
-6 -50
30
-15 +15
0
-12 +12
0
-15 +15
0
010
5
PAN
LR
TRIM
PEAK
AUX
EFX
010
5
PRE/POST
MF
2.5kHz
HF
12kHz
LF
80Hz
-20+20
-10 -50
30
-15 +15
0
-12 +12
0
-15 +15
0
010
5
BALANCE
LR
AUX
EFX
010
5
PRE/POST
MF
2.5kHz
HF
12kHz
LF
80Hz
-15 +15
0
-12 +12
0
-15 +15
0
010
5
BALANCE
LR
75Hz 75Hz
MUTE
ALT 3/4
MUTE
ALT 3/4
MUTE
ALT 3/4
Front Panels Controls
(1). PEAK LED INDICATOR
This LED indicators let you check the level of the
signal input to the channel. The peak indicator
lights when the input signal reaches 5dB below
the channel’s clipping point. This indicator show
the level of the Post-EQ/ pre-fader signal. If the
PEAK indicator lights more than briefly on high-
level transients, you should use the TRIM control
to decrease the input sensitivity of the channel. If
this dose not work, reduce the output level of the
connected source.
(2). TRIM CONTROL
According to the level of the input signal, use this
knob to adjust the input to an appropriate level.
The best balance of S/N and dynamic range will
be achieved if you adjust the TRIM control so
that the peak indicator lights occasionally. This
control adjusts the channel’s mic input sensitiv-
ity between -50dB and -6dB and the line input
sensitivity between -30dB and +14dB.
The mono/stereo combination input channel have
a sensitivity of +20dB to-20dB
(3). HPF(High-Pass Filter)
This switch toggles the HPF on or off. To turn the
HPF on, press the switch In ( ). The HPF cut
frequencies below 75Hz
(4). 3BAND EQUALIZER CONTROLS
This is a 3-band equalizer with center frequen-
cies, range and type as shown below. The
frequency response is flat when the knob is in the
“0”position.
MONO MONO STEREO
STEREO
COMBINATION
1.CHANNEL CONTROL SECTION
(5). AUX CONTROLS
This knobs control the level of the signals sent to
AUX bus.
(6). PRE/POST SWITCH
This button determines whether the AUX signal
is Pre or Post fader. Pre means not affected by
the position of the channel fader. Post means is
affected by the position of the channel fader.
CONTROL MAX.
BOOST/CUT FREQUENCY TYPE
HIGH ±15dB 12kHz Shelving
MID ±12dB 2.5kHz Peaking
LOW ±15dB 80Hz Shelving
2
3
4
5
6
7
8
9
10
11
12
1

5
M1224FX / M1424 / M1624FX / M1824
(7). EFX CONTROLS
This knobs control the level of the signals sent
to EFX bus. The channel signals mixed by this
bus have their overall level set by the EFX SEND
Control to the EFX SEND jack on the front panel.
The EFX bus signal is also fed into the internal
digital signal processor(only M1224FX/1624FX).
Since this control is placed after the channel
fader, the signal level will be affected by the
channel fader setting.
(8). PAN /BAL CONTROL
PAN (Mono Channel)
This control pans the channel signal across the
master L and R buses, thus determining the per-
ceived position of the sound from that channel in
the output stereo sound field. If a PAN control is
set all the way to the left,for example, the sound
from that channel will be heard from the left
speaker system only.
If it is set all the way to the right, the sound will
be heard from the right speaker system only.
Intermediate settings will cause the sound to
appear at corresponding locations in the stereo
sound field.
BALANCE (Stereo Channel)
This control adjusts the balance or the L/R posi-
tion of the stereo input signal.
Turning the BALANCE control to the left of center
moves the apparent source toward the MAIN
MIX L bus,turning it to the right moves the source
toward the MAIN MIX R bus.
(9). MUTE/ALT 3-4 SWITCH
When the Mute/ALT 3-4 switch is depressed, a
channel output will be routed to the ALT 3-4 out-
put instead of the main L/R out.
ALT 3-4 bus offers you a second independent
stereo sub mix with its own sub master stereo
fader.
(10). PFL SWITCH
When these switch is depressed, the channel
input signal can be routed to the PFL bus.
This switch allows you to monitor the pre-fader
channel input signal through headphone outputs
and control room outputs.
(11). PFL INDICATOR
This indicator lights when the PFL switch is turned on.
(12). CHANNEL FADER
This is the channels main level control. It deter-
mines the level of the signal that is sent from the
channel to the master mixing and effect buses.
It is the settings of the input channel faders that
determine the mix, or the balance of sound levels
between the instruments or other sources con-
nected to the inputs. When a channel is not being
used, its fader should be set at the minimum po-
sition to prevent the addition of unwanted noise
to the main program signal.
Front Panels Controls
Front Panels

6
M1224FX / M1424 / M1624FX / M1824 Front Panels
STEREO RETURN
AUX/EFX SEND
TAPE IN PHONES/CTRL-R
ALT 3/4
MAIN
TAPE IN
PHANTOM POWER POWER
PROGRAM
SELECT
EFX RTN
EFX
PFL
+10
5
0
5
10
15
20
30
40
ALT 3/4
TO MAIN L/R
+10
5
0
5
10
15
20
30
40
+10
5
0
5
10
15
20
30
40
ON
OFF
-20
-10
-7
-4
-2
0
+2
+4
+7
CLIP
AUX
010
5
AUX
010
5
MAIN
010
5
EFX
010
5
LEVEL
010
5LEVEL
010
5
AUX
010
5
PERFORMANCE
HALL REVERB
PLATE REVERB
SPRING REVERB
ECHO
FLANGE+VERB
CHORUS+VERB
ECHO+VERB
CHORUS
FLANGE
PFL
12 CH MIXING CONSOLE
M1224FX HPA
L/ALT3 R/ALT4
MAIN L/R
ON
Front Panels Controls
(1). DSP PROGRAM DISPLAY
The Program Number LED displays the number
of the selected effects program.
(2). DSP PROGRAM SELECT SWITCH
The program knob selects one of the 100 built-in
digital effects, for each number you select. 24 Bit
Digital Effects processor with high quality, studio
grade effects like Delay, Chorus and Reverb.
(3). AUX PRE CONTROL
Adjust the level of the signal sent from the inter-
nal digital effect to the aux1 bus.
(4). DSP ON/ OFF SWITCH
This switch turns the internal digital effect on/off.
(5). PFL SWITCH
Set this switch on if you wish to output the effect
signal to the PFL bus.
(6). PFL INDICATOR
This indicator lights when the PFL switch is
turned on.
(7). EFX RTN Fader
Adjust the level of the signal sent from the inter-
nal digital effect to the main bus.
(8). ALT 3/4 OUTPUT FADER
This fader adjusts the final level of the combined
stereo signal and send the ALT 3/4 output jacks.
(9). TO MAIN SWITCH
When this switch is on, the signal of each ALT 3/4
will be sent to the MAIN L/R buses.
(10). MAIN L/R MASTER FADER
These faders adjust the final level of the com-
bined signals from all channels.
* No. 1~7 are applied only to M1224FX/1624FX
1.MAIN CONTROL SECTION
2
1
4
5
6
7
9
8
10
11
12
13
14
15
16
17
18
19
20
3

7
M1224FX / M1424 / M1624FX / M1824 Front Panels
(12). CTRL ROOM /PHONES CONTROL
Controls the level of the signal output to the
PHONES jack and the CTRL ROOM L and R
jacks.
(13). TAPE IN CONTROL
This control adjusts the level of the playback sig-
nal that is inserted to the master mixing bus from
the TAPE IN RCA jacks on the top panel.
14. MASTER SEND
* Master AUX Control
Adjust the level of the signal on the AUX bus to
the corresponding AUX SEND jack.
* Master EFX Control
Adjust the level of the signal on the EFX bus.
This is the signal that is output through the EFX
SEND jack.
15. PFL INDICATOR
This indicator lights when the PFL switch is
turned on.
16. OUTPUT LEVEL METER
A vertical row of ten LED show the continuous
output level of main Output L/R or monitor 1/2 by
signal select switch.
This type of display is free from over shoot prob-
lem of mechanical meters and is highly visible
under poor lighting conditions. The 0 LED means
an output level of +4dB, for +4dB output-that’s
the rated level.
17. STEREO RETURN CONTROL
* AUX CONTROL
Adjust the level of the mixed L/R signal sent from
the RETURN jack (L (MONO) and R) to the AUX
bus.
* MAIN CONTROL
Adjust the level of the mixed L/R signal sent from
the RETURN jack (L (MONO) and R) to the Main
L/R bus.
18. POWER INDICATOR
This indicator lights when the power switch is
turned on.
19. PHANTOM POWER SWITCH
This switch toggles phantom power on/off. If you
set the switch on, the mixer supplies power to all
channels that provide XLR mic input jacks.
Set this switch on when using one or more con-
denser microphones.
NOTE:When this switch is on, the mixer supplies
DC +48V power to pins 2 and 3 of all XLR-type
MIC INPUT jacks.
Front Panels Controls
11. Level-Meter Signal Switches (MAIN-ALT3/4
Toggle Switch and TAPE IN Switch)
These level-meter switches, together with the
channel PFL switches, select the signal that is
sent through the CTRL ROOM/PHONES control
to the CTRL ROOM OUT jacks, the PHONES
jack, and the level meter.The following illustration
shows how the switch settings correspond to the
signal selection.
Signal Switch PFL TAPEIN ALT3 / 4
PFL ON
TAPE IN
OFF
OFF
OFF
ALT3/4
MAIN
ON
ON
C-R OUT
&
PHONES
Be sure to leave this switch off ( ) if you
do not need phantom power.
When tuning the switch on ( ), be sure
that only condenser mics are connected to
the XLR input jacks.
Devices other than condenser mics may
be damaged if connected to the phantom
power supply. Note, however, that the
switch may be left on without problem
when connecting to balanced dynamic
microphones.
To avoid damage to speakers, be sure to
turn off amplifier (on powered speakers)
before turning this switch on or off. We
also recommend that you turn all out con-
trols (MAIN master fader, ALT3/4 fader,
etc.) to minimum settings before operat-
ing the switch, to avoid risk of loud noises
that could cause hearing loss or device
damage.
(20).PHANTOM POWER INDICATOR
This indicator lights when the phantom power
switch is turned on.
*
*
*

8
M1224FX / M1424 / M1624FX / M1824 Front Panels
Front Panels Controls
1. INPUT/OUTPUT CONNECTORS
(4). STEREO RETURN L (MONO), R Jack
These are unbalanced 1/4” phone-type line input
jacks. The signal received by these jacks is sent
to the MAIN bus and AUX bus. These jacks are
typically used to receive a return signal from an
external effect (reverb, delay, etc.)
NOTE:These jacks can also be used as an auxil-
iary stereo input. If you connect to the L (MONO)
jack only, the mixer will recognize the signal as
monaural and will propagate the identical signal
on both L and R jacks
(5). TAPE IN JACKS
These RCA pin jacks input a stereo sound
source. Use these jacks when you want to con-
nect a CD or DAT directly to the mixer for moni-
toring.
NOTE:You can adjust the signal level using the
TAPE IN control the Master control section.
(6). REC OUT JACKS
The REC OUT jacks send the pre-fader signal
from the master bus for recording by the tape
deck.
(7). SEND JACKS
* AUX
These are unbalanced phone jacks-type output
jack.
This jack output the signal form AUX bus, respec-
tively. You use this jack, for example, to connect
MONOMONOMONO AUX
RETURN
TAPE IN REC OUT
ALT 3/4 OUTPUTFOOT SWITCH
MAIN OUTPUT
CONTROL ROOM
LINE
INSERT
1
MIC
OUT IN
LINE
INSERT
2
MIC
LINE
INSERT
3
MIC
LINE
INSERT
4
MIC
LINE 5
LINE 6
5/6
MIC
LINE 7
LINE 8
7/8
LINE 9
LINE 10
LINE 9
LINE 10
LINE 11
LINE 12
9/10
MIC
LINE 11
LINE 12
11/12
AUX
EFX
HEADPHONE
(1). Channel Input Jacks
MIC JACKS
A 3-pin XLR-type connector is used for balanced
low impedance microphone inputs.(1: sleeve, 2:
hot, 3:cold)
BALANCED LINE IN JACKS.
A standard 1/4” phone jack is used for balanced
or unbalanced line level signals. Examples of line
level signals include most electronic keyboards,
synthesizers, turn-tables(with appropriate pre-
amps), tape decks and the line outputs from
other mixers.
(2). CHANNEL INSERT I/O JACK
These are input/output jacks located between the
head-amplifier and the high pass filter.
These jacks allow you to own graphic equalizers,
compressors, noise filters, or other devices.
Tip:Output(Send to external device)
Sleeve:Ground
Ring:Input(Return from external device)
(3). CHANNEL INPUT JACKS
These are unbalanced stereo line input jacks.
Two jack types are provided, phone type and
RCA pin type.
1
2
35
47
68
10
911
12

9
M1224FX / M1424 / M1624FX / M1824
NOTE:The signal monitored by these jacks is
selected by the settings of the MAIN-ALT3/4
toggle switch, the TAPE IN switch, and the PFL
switches on the input channels.
to an effector or to a cue box or other such moni-
toring system.
* EFX
These are unbalanced phone jacks-type output
jack that output the signal form the EFX bus.
You use this jack, for example, to connect to an
external effector
(8). FOOT SWITCH JACK (Applied only to
M1224FX / M1624FX)
This phone input jack can connect to the foot
switch.
With the foot switch connected, you can use your
foot to toggle the digital effects ON and OFF
(9). ALT 3/4 OUTPUT JACKS
These are unbalanced 1/4” phone type output
jacks which output the signals of ALT 3/4 bus.
Use these jacks to connect to the input jack of an
MTR, external mixer, or other such device.
(10). MAIN L/R OUTPUT JACKS
These jacks deliver stereo output of the mixer
signal. You use these jacks, for example, to
connect to the power amplifier driving your main
speakers. You also use these jacks when you
wish to record the signal utilizing the level control
applied by the main fader in the Master Control
section.
TRS phone-type balanced output jack.
(11). CONTROL ROOM OUTPUT JACKS
Use these stereo phone-type output jacks to con-
nect to your monitor system.
NOTE:The signal monitored by these jacks is
selected by the settings of the MAIN-ALT3/4
toggle switch, the TAPE IN switch, and the PFL
switches on the input channels.
(12). PHONES JACK
Connect for headphones. This is stereo phone-
type output jack.
(1/4" Phone 3 Section Connector)
( O )
(1/4" Phone 2 Section Connector)
( X )
Front Panels Controls
Front Panels

10
M1224FX / M1424 / M1624FX / M1824 Rear Panels
Rear Panels Controls
DESIGNED AND ENGINEERED IN KOREA
POWERAC ADAPTOR IN
ON
OFF
12 CH MIXING CONSOLE
M1224FX
HPA
1. AC ADAPTOR IN CONNECTOR
Connects to the included PA-M1224 power adaptor.
NOTE:Use only the PA-M1224 adaptor included
with this mixer. Use of a different adaptor may
result in fire or electric shock.
2. POWER SWITCH
Use this switch to power mixer to ON or OFF.
21

11
M1224FX / M1424 / M1624FX / M1824
- In all cases, use good quality twin screened audio cable. Check for instability at the output.
- Always connect both conductors at both ends, and ensure that the screen is only connected at one end.
- Do not disconnect the mains earth from each piece of equipment. This is needed to provided both safety
and screen returns to the system star point.
- Equipment which has balanced inputs and outputs may need to be electrically isolated from the equip-
ment rack and/or other equipment, to avoid earth loops.
It is important to remember that all equipment which is connected to the mains it a potential source of hum
and interference and may radiate both electrostatic or electromagnetic radiation. In addition, the mains will
also act as a carrier for many forms of RF interference generated by electric motors, air-conditioning units,
thyristor light dimmers etc. Unless the earth system is clean, all attempts to improve hum noise levels will
be futile. In extreme cases there will be no alternative but to provide a completely separate and independ-
ent ‘technical earth’ to replace the incoming ‘noisy earth’. However, always consult your local electricity
supply authority to ensure that safety regulations are not being infringed.
Points to Remember
HPA products are wired to reflect accepted wiring practices used throughout the world.
Balanced XLR connectors are wired as described:
Pin #1 Shield
Pin #2 Positive
Pine #3 Negative
Balanced 1/4” TRS connectors are wired as described:
Tip is Positive
Ring is Negative
Sleeve is Shield
Connections
Insert Points
A
mp/Line Input
Headphones
Unbalanced
Input/Output
AUX Send
Ring
Ring
Tip
Tip
Sleeve
Sleeve
Send
Return
Screen
Hot (positive)
Cold (negative)
Screen
Left Signal
Right Signal
Ground
Signal
Ground
3 Pole (Stereo) Jack
2 Pole (Mono) Jack
Ring TipSleeve
TipSeeve
2
1
3
Balanced Input
Hot (positive)
Hot (positive)
Sleeve
Screen
Cold (negative)
Cold (negative)
Points to Remember

12
M1224FX / M1424 / M1624FX / M1824
CONNECTOR AND CABLE CONFIGURATIONS
Connections
Connections
2
3
1
TRS
2
3
1
2
3
1
(XLR)
(XLR)
White(Red)/HIGH
A. XLR**
B. TRS PHONE
Black/LOW
Shield/GND
White(Red)/HIGH Black/LOW
Shield/GND
TS
TTSS
2
3
1
(XLR)
(Standard Phone)
D. STANDARD
PHONE
E. SHIELD/GND
PHONE
White(Red)/HIGH Black/LOW
Shield/GND
White(Black)/HIGH
Shield/GND
TS
2
3
1
(XLR)
C. STANDARD
PHONE
White(Red)/HIGH Black/LOW
Shield/GND
Floating or Balanced
low impedance: most
professional equipment
line in and line out,
microphones.
Unbalanced
low impedance: some
professional equipment
and microphones.
Unbalanced
high impedance: most
hi-fi equipment.
Unbalanced
high impedance: most
hi-fi equipment.
REMOTE DEVICE REMOTE SIDE OF CABLE
DESCRIPTION CABLE (Connector Type)
Connector and cable configurations recommended for use with the M 4 Bus Series.
These cables are based on the use of auxiliary equipment that is isolated from the AC power mains.

13
M1224FX / M1424 / M1624FX / M1824
Applications
Applications
MONOMONOMONO
AUX
RETURN
TAPE IN REC OUT
ALT 3/4 OUTPUTFOOT SWITCH
MAIN OUTPUT
CONTROL ROOM
LINE
INSERT
1
MIC
OUT IN
LINE
INSERT
2
MIC
LINE
INSERT
3
MIC
LINE
INSERT
4
MIC
LINE 5
LINE 6
5/6
MIC
LINE 7
LINE 8
7/8
LINE 9
LINE 10
LINE 9
LINE 10
LINE 11
LINE 12
9/10
MIC
LINE 11
LINE 12
11/12
AUX
EFX
HEADPHONE
Microphone
Guitar Powered Monitor
Speakers
Foot Switch
Sound Source(CD,MD,DAT,
Cassette,Video etc.)
Master Recorder(MD,DAT.)
Synthesizer
MTR
Rhythm Machine
Effector
Effector
COMPACT DISC PLAYER
PROGRAM EJECT
POWER
REPEAT SKIP FWD
MIN MAX
PLAY/PAUSE LEVEL
STOP
REW
COMPACT DISC PLAYER
PROGRAM EJECT
POWER
REPEAT SKIP FWD
MIN MAX
PLAY/PAUSE LEVELSTOP
REW
Before connecting to microphones and instruments, be sure that all devices are turned off. Also be
sure that all of the mixer’s channel fader and master control faders are set all the way down.
For each connection, connect one end of the cable to the relevant microphone or instrument and
connect the other end to the appropriate input jack on the mixer.
NOTE: Where an input channel provides both a MIC INPUT jack and a LINE INPUT jack, you may
use either one of these jack but you may not use both at the same time. Please connect to
only one of these jacks on each channel.
To avoid causing damage to speaker, power up the devices in the following order: Peripheral de-
vices →mixer →power amps (or powered speakers).
NOTE: When shutting the system down, turn off the power in the opposite order: Power amps
(powered speakers) →mixer →Peripheral devices.
1.
2.
3.
Setup Procedure
Home Recording

14
M1224FX / M1424 / M1624FX / M1824 Application
MONOMONOMONO AUX
RETURN
TAPE IN REC OUT
ALT 3/4 OUTPUTFOOT SWITCH
MAIN OUTPUT
CONTROL ROOM
LINE
INSERT
1
MIC
OUT IN
LINE
INSERT
2
MIC
LINE
INSERT
3
MIC
LINE
INSERT
4
MIC
LINE 5
LINE 6
5/6
MIC
LINE 7
LINE 8
7/8
LINE 9
LINE 10
LINE 9
LINE 10
LINE 11
LINE 12
9/10
MIC
LINE 11
LINE 12
11/12
AUX
EFX
HEADPHONE
Guitar
Main Speakers
(External)
Power Amp
Synthesizer
Effector
Effector
Stage (Internal)
ST
AUX
(PRE )
Audience(External) ST
Microphone
Bass
Foot Switch
CD Player
Monitor Speakers
(Internal)
Power Amp
CD,Cassette,or
DAT Recorder
PRE
DI
Sound Reinforcement for Live Performance

15
M1224FX / M1424 / M1624FX / M1824
Block diagrams
Block Diagrams

16
M1224FX / M1424 / M1624FX / M1824 Specifications
Specifications
*0dB=0.775Vrms, 0dBV=1Vrms
-GENERAL
Maximum Output Level
(0.5% T.H.D at 1kHz)
+26dB(MAIN L/R) ,+20dB(ALT 3/4, AUX/EFX, CTRL ROOM)
+20dB(INSERT) , More than 100mW(HEADPHONES) @33Ω
T.H.D <0.1% @+14dB 20Hz ~ 20kHz (MIX L/R, ALT 3/4, AUX /EFX SEND, CTRL ROOM)
Frequency Response 20Hz ~ 20kHz, +1/-2dB (MIX L/R, ALT 3/4, AUX /EFX SEND, CTRL ROOM)
Hum and Noise (Average,
Rs=150Ω)
-127dB equivalent input noise, -95dB residual noise (MIX L/R, ALT 3/4, AUX/EFX SEND
CTRL ROOM OUT), -88dB (MIX L/R, ALT 3/4, AUX/EFX SEND, CTRL ROOM OUT)
* Master fader at nominal level and all channel fader Minimum.
Maximum Voltage Gain
74dB MIC IN TO Main L/R, 74dB MIC IN TO ALT3/4, 66dB MIC IN TO AUX (PRE) ,
76dB MIC IN TO AUX (POST), 76dB MIC IN TO EFX(REV), 80dB MIC IN TO CON-
TROL ROOM L/R, 52.2dB MIC IN TO REC L/R, 54dB LINE IN TO MAIN L/R 54dB,
LINE IN TO ALT3/4, 46dB LINE IN TO AUX (PRE), 56dB LINE IN TO AUX (POST),
56dB LINE IN TO EFX(REV), 60dB LINE IN TO CONTROL ROOM L/R, 44dB ST IN
TO MAIN L/R, 44dB ST IN TO ALT3/4, 16dB AUX RETURN IN TO MAIN L/R, 20dB
TAPE IN TO MAIN L/R
Crosstalk (at 1kHz) -70dB between input channels, -70dB between input/output channels
Gain Control(mono Input
Channel) 44dB Variable (-50dB ~ -6dB), (-30dB ~ +14dB)
Gain Control(mono/stereo
combination Input ch) 40dB Variable (-20dB ~ +20dB)
Input Channel Equalization HIGH: 12kHz shelving, MID : 2.5kHz peaking LOW: 80Hz shelving * Turnover/roll off
frequencies: located 3dB below maximum boost/cut
LED Meters 10-Segment LEDx2 MAIN L/R, ALT 3/4,PFL,TAPE IN.
Internal Digital Effect 100 selectable presets
FOOT switch (ON/OFF)
Channel Indicators Peak: An indicator for each channel turns on when the pre-channel fader signal is
5dB below clipping.
Phantom +48V DC Power
(Balanced input) Supplied when Phantom +48V switch is ON
Included Accessory Power adaptor (PA-M1224)
Power Supply
USA and Canada: 120V AC 60Hz
Europe: 230V AC 50Hz
Australia: 240V AC 50Hz
Power Consumption 36W
Weight M1224FX/M1424 : 4.6kg, M1624FX/M1824 : 5.9kg.
Dimensions(W x D x H)mm M1224FX/M1424: 420 x 328 x 90mm , M1624FX/M1824: 420 x 436 x 90mm

17
M1224FX / M1424 / M1624FX / M1824 Specifications
Specifications
Specifications and design subject to change without notice for improvements.
-INPUT
Input Connector Input
Impedance
Nominal
Impedance
Rated
Input Level Connector Type
CH Mic 4kΩ50 ~ 600Ω-50dB XLR 3-31 Type Balanced
CH Line 10kΩ600Ω-30dB Phone Jack (TRS) T = Hot
R = Cold S = GND
Stereo Input Mic 3kΩ600Ω-44dB XLR 3-31 Type Balanced
Stereo Input 5kΩ600Ω-20dB Unbalanced Phone Jack
Mono Channel Insert Input 10kΩ600Ω0dB Phone Jack (TRS) T = Out
R = In S = GND
Tape In 10kΩ600Ω-10dBV RCA pin Jack
-OUTPUT
Output Connector Output
Impedance
Nominal
Impedance
Rated Output
Level Connector type
MIX Out L/R 240Ω20KΩ+4dB Balanced Phone Jack
ALT 3/4 75Ω10KΩ+4dB Unbalanced Phone Jack
CTRL Room Out 75Ω10KΩ+4dB Unbalanced Phone Jack
Aux Send 75Ω600Ω+4dB Unbalanced Phone Jack
Mono Channel Insert Input 600Ω10kΩ0dB Phone Jack (TRS)T = Out
R = In S = GND
Rec Out 600Ω10kΩ-10dBV RCA pin Jack
Phones Out 100Ω33Ω3mW Stereo Phone Jack

18
M1224FX / M1424 / M1624FX / M1824
Procedures
Take steps to insure the problem is not related to operator error or other products within the system. Infor-
mation provided in the troubleshooting portion of this manual may help with this process. Once it is certain
that the problem is related to the product contact your warranty provider as described in the warranty sec-
tion of this manual.
Schematic
A Schematic is available by contacting your warranty provider.
Parts List
A Parts List is available by contacting your warranty provider.
Service
Variations
Products supplied through legitimate sources are compatible with local AC power requirements.
Options
No optional items are available for this product.
Variations and Options
Warranty terms and conditions vary by country and may not be the same for all products. Terms and con-
ditions of warranty for a given product may be determined first by locating the appropriate country which
the product was purchased in, then by locating the product type.
To obtain specific warranty information and available service locations contact HPA directly or the author-
ized HPA Distributor for your specific country or region.
Warranty
Service