Mach MS 3 User manual

MS 3
M20.02
M20.03
Audio Controller
user manual

3SMdna,30.02M,20.02M2
s e c t i o n 1
I N T R O D U C T I O N
S a f e t y P r e c a u t i o n s
• Read this manual before operating the controller.
• To avoid the risk of electrical shock, do not remove any cover from the controller while it is connected to AC power.
• Do not expose the controller to rain or moisture.
G e n e r a l p r e c a u t i o n s
• Do not operate the controller near heat sources such as radiators, etcetera.
• Connect only to a power supply as marked on the controller.
• Do not drop the controller.
• Do not spill liquids onto or into the controller.
• Refer all service to a qualified technician.
Te c h n i c a l B a c k g r o u n d
When working with loudspeakers, there are 5 decisive factors for maximizing sound quality speaker lifetime:
• excursion control
• input power control
• frequency segmentation
• controller-generated distortion
• controller-generated noise
To avoid mechanical damage to the speaker units, the excursion of the speaker cones must be controlled. The M20.02,
M20.03, and MS 3 accomplish this with a subsonic filter and limitation.
To avoid electrical damage to the speaker units, the power sent to the voice coils must be controlled. The M20.02, M20.03, and
MS 3 use limiters for this purpose.
To get the best sound, the speaker units must be driven within the proper frequency range. This is accomplished by the cross-
over in the M20.02, M20.03, and MS 3. In addition, the controller must not add distortion to the system.
To get the best signal to noise ratio, the noise floor of the controller must be below the general noise. This is achieved by sur-
face mounted device (SMD) technology on double-sided printed circuit boards.

M20.02, M20.03, and MS 3 Design Concept 3
section 2
M20.02, M20.03, AND MS 3 DESIGN CONCEPT
The subsonic filter is a 24dB Butterworth for maximum sound quality and security.
The crossover filter configuration is a 24dB Linkwitz-Riley to get the best electronic summation of the crossover points and to
optimize amplifier power.
The feedback sense is electronically isolated from the controller signal to get the lowest noise and highest security for the
amplifier.
The inputs and outputs are built as electronically servo-balanced transformers.
The components used in the controller are selected for audio quality, reliability, minimum distortion and noise.
In addition, the 20.03 includes an adjustable high-pass equalizer to pre-equalize the loudspeaker horns for correct frequency
response.
M20.02 Block Diagram
Input stage: The input signal first passes through an electronically balanced input stage and is then simultaneously directed to
the low pass (LP) and high pass (HP) section.
Low pass section: The signal is first subsonically filtered with a 24dB Butterworth high pass filter. Thereafter the signal is fil-
tered to its crossover point with a 24dB Linkwitz-Riley low pass filter. The signal then passes through the limitation section to
the electronically servo-balanced output stage.
High pass section: The signal is first filtered to its crossover point with a 24dB Linkwitz-Riley high pass filter. The signal
then passes through the limitation section to the electronically servo-balanced output stage.
The sense input on the controller measures the amplifier output directly. If the signal is too high compared to the settings of the
internal DIP-switches, the signal to the amplifier will be reduced.

4 M20.02, M20.03, and MS 3
M20.03 and MS 3 Block Diagram
Input stage: The input signal first passes through an electronically balanced input stage and is then simultaneously directed to
the low pass (LP), mid pass (MP) and high pass (HP) section.
Low pass section: The signal is first subsonically filtered with a 24dB Butterworth high pass filter. Thereafter the signal is fil-
tered to its crossover point with a 24dB Linkwitz-Riley low pass filter. The signal then passes through the limitation section to
the electronically servo-balanced output stage.
Mid pass section: The signal is subsonically filtered with a 24dB Linkwitz-Riley high pass filter at the right crossover point
between the low and mid section. Thereafter, the signal is filtered to its crossover point between the mid and high section with
a 24dB Linkwitz-Riley low pass filter. The signal then passes through the limitation section to the electronically servo-bal-
anced output stage.
High pass section: The signal is first filtered to its crossover point with a 24dB Linkwitz-Riley high pass filter. The signal
then passes through the limitation section to the electronically servo-balanced output stage.
The sense input on the controller measures the amplifier output directly. If the signal is too high compared to the settings of the
internal DIP-switches, the signal to the amplifier will be reduced.

Installation 5
section 3
INSTALLATION
Mounting
The M20.02, M20.03, and MS 3 fit in a standard 19 by 1.75 inch rack unit.
Connectors
The input and output are fully balanced, but can be operated in unbalanced mode without problems. The plugs are standard 3-
pin XLR connectors wired pin 1 = shield, pin 2 = (+), and pin 3 (-).
Voltage Switch
The voltage switch is found on the back of the controller. Be sure to select the voltage that matches your AC supply before
connecting and operating the controller.
Mains Connection
By using a standard IEC receptacle and mains cable, all of the international safety requirements are met.
Speaker sense cable connection
Two types of wire sets are used. Type 1 wire sets single-color wires only. The colors are blue, green, black, white, brown, yel-
low, red, and orange. Type 2 wire sets have 4 single-color wires (brown, green, blue, and orange) and 4 two-color wires (white/
brown, white/blue, white/orange, and white/green). Connect the left and right channel speaker sense input cables as described
for your type of wire set. Note: The signal polarity each cable pair does not matter.
Type 1 wire sets
The RED and ORANGE wires are not used.
• Connect the BLUE and GREEN wires from the right channel sense input cable to the positive (+) and negative (-)
terminals of the amplifier’s right channel LOW FREQUENCY speaker output.
• Connect the BLACK and WHITE wires from the right channel sense input cable to the positive (+) and negative (-)
terminals of the amplifier’s right channel MID FREQUENCY speaker output. (M20.03 and MS 3 only)
• Connect the BROWN and YELLOW wires from the right channel sense input cable to the positive (+) and negative (-)
terminals of the amplifier’s right channel HIGH FREQUENCY speaker output.
• Similarly, connect the wires from the left channel speaker sense input cable to the amplifier’s left channel outputs.
Type 2 wire sets
The BLUE and ORANGE wires are not used.
• Connect the WHITE/BROWN and WHITE/BLUE wires from the right channel sense input cable to the positive (+)
and negative (-) terminals of the amplifier’s right channel LOW FREQUENCY speaker output.
• Connect the WHITE/ORANGE and WHITE/GREEN wires from the right channel sense input cable to the positive (+)
and negative (-) terminals of the amplifier’s right channel MID FREQUENCY speaker output. (M20.03 and MS 3 only)
• Connect the BROWN and GREEN wires from the right channel sense input cable to the positive (+) and negative (-)
terminals of the amplifier’s right channel HIGH FREQUENCY speaker output.
• Similarly, connect the wires from the left channel speaker sense input cable to the amplifier’s left channel outputs.
Fuse Replacement
If the fuse blows, something is wrong. Be sure to fix the problem before replacing the fuse. Also be sure that the replacement
fuse is of the correct rating and type.
Limiter Settings
The limiter is set from DIP switches inside the cabinet. Before opening the cabinet, be sure that the main power cable is dis-
connected. The settings for Mach speakers are shown in section 5.

6 M20.02, M20.03, and MS 3
section 4
CONTROLS
M20.02 Controls
Front Panel
1. Main power switch
2. Low output - Left
3. Low output - Right
4. High output - Left
5. High output - Right
Rear Panel
0dB
-00 +6
0dB
-00 +6
LEFT RIGHT
LOW 0dB
-00
+6
0dB
-00
+6
LEFT
RIGHT
HIGH
POWER
M20.02 CONTROLLER
Mach
1
2 345
MAINVOLTAGE Right channel Left Channel
Vol tage
Selector SPEAKER
SENSE SPEAKER
SENSE
LOW HI IN LOW HI IN
123 678 945 10
1. Mains voltage selector
2. Mains voltage connector
3. Right channel sense input
4. Right low output
5. Right high output
6. Right input
7. Left channel sense input
8. Left low output
9. Left high output
10. Left input
Right Left
+- +-
Right Left
+- +-
HIGH
LOW
white/brown
white/blue
green
brown
white/blue white/brown
white/bluewhite/blue
green
brown

Controls 7
M20.03 and MS 3 Controls
Front Panel
1. Main power switch
2. Low output - Left
3. Low output - Right
4. Mid output - Left
5. Mid output - Right
6. High output - Left
7. High output - Right
Rear Panel
0dB
-00 +6
0dB
-00 +6
LEFT RIGHT
LOW 0dB
-00 +6
0dB
-00 +6
LEFT RIGHT
MID 0 dB
-00 +6
0dB
-00 +6
LEFT RIGHT
HIGH
POWER
M20.03 CONTROLLER
Mach
1
2 36745
MAINVOLTAGE Right channel Left Channel
Vol tage
Selector SPEAKER
SENSE SPEAKER
SENSE
LOW MID HI IN LOW MID HI IN
123 6789 4510 11 12
1. Mains voltage selector
2. Mains voltage connector
3. Right channel sense input
4. Right low output
5. Right mid output
6. Right high output
7. Right input
8. Left channel sense input
9. Left low output
10. Left mid output
11. Left high output
12. Left input
Right Left
+- +-
Right Left
+- +-
Right Left
+- +-
HIGH
MID
LOW
white/brown
white/blue
green
brown
white/blue
white/orange
white/green
white/brown
white/orange
white/green
green
browngreen
white/bluewhite/blue

8 M20.02, M20.03, and MS 3
section 5
OPERATION
M20.02 Limiter Selection
To access the DIP-switches, remove the top plate. The DIP-switches are positioned as shown.
0 = OFF
1 = ON DIPs 1 and 3 123456 DIPs 2 and 4 123456
M12T - 010010
M15T - 001000
M30T - 001000
M72i - 111000
M82i - 100000
M125i 011000
M127i 010100
M129i 010000
M154i - 001000
M156i - 001000
M151i 011000 -
M152i 011000 -
M181T 000010 -
M182i / M182T 000010 -
DIP-switch settings, M20.02 Audio Controller
12 34
DIP-Switch Locations

Operation 9
M20.03 Limiter & Equalization Selection
DIP-switches 1 - 6 set the limiter levels for each output channel. DIP-switches 7 and 8 set the equalization level.
0 = OFF
1 = ON DIPs 1 and 4 123456 DIPs 2 and 5 123456 DIPs 3 and 6 123456 DIPs 7 and 8 123456
M12T - 010000 111000 -
M15T - 001000 111000 -
M30T - 001000 111000 -
M127i - 011000 111111 100010
M129i - 011000 111000 110010
M151i 011000 - - -
M152i 011000 - - -
M154i - 001010 111100 111100
M156i - 001010 111000 100110
M181T 000010 - - -
M182i / M182T 000010 - - -
DIP-switch settings, M20.03 Audio Controller
12 3 456
78
M20.03 DIP-Switch Locations

10 M20.02, M20.03, and MS 3
MS 3 Limiter Selection
0 = OFF
1 = ON DIPs 1 and 4 123456 DIPs 2 and 5 123456 DIPs 3 and 6 123456
MS 1262 - 000010 000100
MS 118 000010 - -
DIP-switch settings, MS 3 Audio Controller
MS 3 DIP-Switch Locations
12 3 456

Specifications 11
section 6
SPECIFICATIONS
M20.02 Specifications
INPUT
• TYPE:......................................................................................................................Electronically balanced
• IMPEDANCE:................................................................................................................................47k Ohm
• OPERATING LEVEL...........................................................................................................................0 dB
• MAX. INPUT:................................................................................................................. +21 dB V (10.5V)
SENSE INPUT
• TYPE:...............................................................................................................................Amp output sense
• MAX. INPUT:......................................................................................................................................110V
OUTPUT
• IMPEDANCE:..................................................................................................................................50 Ohm
• MAX. OUTPUT:............................................................................................................... +21dBV (10.5V)
• BANDWIDTH: ......................................................................................35 Hz - 110 Hz, 110 Hz - 160 kHz
• THD:............................................................................................................................................... 0.0015%
• S/N:....................................................................................................................................................112 dB
CONTROLS
• OUTPUT: ................................................................................................................................... -00---+6dB
DIP SWITCHES
• 1-3:................................................................................................................................ Limiter settings low
• 2-4:............................................................................................................................... Limiter settings high
INDICATORS
• 4 LED GREEN: .......................................................................................... SIGNAL SEND TO OUTPUT
• 4 LED RED: ................................................................................................... LIMITERS IN FUNCTION
• 1 LED BLUE: .................................................................................................................... MAIN POWER
POWER SUPPLY
• MAINS VOLTAGE:.................................................................................100-120/220-240 VAC 50-60 Hz
• POWER CONSUMPTIONS:..........................................................................................................9 WATT
• FUSE:...............................................................................................................................................100 mA
• MAINS CONNECTION:.......................................................................STANDARD IEC RECEPTACLE
PHYSICAL
• DIMENSIONS (HxWxD):................................................................1.75 x 19 x 5 in (44 x 482 x 128 mm)
• NET WEIGHT:....................................................................................................................................2.2 kg
• SHIPPING WEIGHT: .........................................................................................................................3.0 kg

12 M20.02, M20.03, and MS 3
M20.03 and MS 3 Specifications
INPUT
• TYPE: .........................................................................................................................................Differential
• IMPEDANCE:............................................................................................................................... 47k Ohm
• OPERATING LEVEL............................................................................................................................0 dB
• MAX. INPUT: ...................................................................................................................21 dBV (10.5 V)
SENSE INPUT
• TYPE: .......................................................................................................................................Amp voltage
• MAX. INPUT: ......................................................................................................................................110V
OUTPUT
• IMPEDANCE:................................................................................................................................. 50 Ohm
• MAX. OUTPUT: ...............................................................................................................................20dBV
• BANDWIDTH:................................................................................35-110 Hz, 110-1200 Hz, 1.2-120KHz
• THD:...............................................................................................................................................0.0015%
• S/N:....................................................................................................................................................112 dB
CONTROLS
• OUTPUT:.....................................................................................................................................-00 - +6dB
DIP SWITCHES
• 1-4:....................................................................................................................................Limit sense LOW
• 2-5......................................................................................................................................Limit sense MID
• 3-6....................................................................................................................................Limit sense HIGH
• 7-8 (M20.03 only).........................................................................................................................Eq. HIGH
INDICATORS
• 6 LED GREEN:.......................................................................................... SIGNAL SEND TO OUTPUT
• 6 LED RED:.................................................................................................... LIMITERS IN FUNCTION
• 1 LED BLUE:..................................................................................................................... MAIN POWER
POWER SUPPLY
• MAINS VOLTAGE: .................................................................................100-120/220-240 VAC 50-60 Hz
• POWER CONSUMPTIONS:...........................................................................................................9 WATT
• FUSE:............................................................................................................................................... 100 mA
• MAINS CONNECTION:....................................................................................... Standard IEC receptacle
PHYSICAL
• DIMENSIONS (HxWxD):................................................................1.75 x 19 x 5 in (44 x 482 x 128 mm)
• NET WEIGHT:................................................................................................................................... 2.2 kg
• SHIPPING WEIGHT:......................................................................................................................... 3.0 kg