Baldwin Boxall Communications Ltd.
Wealden Industrial Estate, Farningham Road
Crowborough, East Sussex, TN6 2JR
Telephone: 01892 664422 Fax: 01892 663146
Website: www.baldwinboxall.co.uk
Email: mail@baldwinboxall.co.uk
C O M M U N I C A T I O N S
IMITRE
Issue 2 10/05/2000
Mitre Amplifiers
Operating Instructions
- 2 -
Issue 2
M
ITRE DESCRIPTION AND SPECIFICATIONS
The Mitre range of amplifiers consists of integrated slave and tuner/amplifier models. They are
designed to give a high degree of flexibility as well as quality and reliability.
Integrated Amplifiers M2000M (Mixer) M2060M (60 Watt), M2120M (120 Watt), M2300M (300
Watt)
1. Four balanced microphone/line universal inputs.
2. Each universal input has the option of cascade priority, phantom power, chime and volume
restoration/busy, XLR or screw terminations.
3. Built-in one, two or three note chime with pre-set volume control.
4. Built-in alarm tone generator with pre-set volume control. Tones are adjustable. A continuous
900 Hz- tone or continuous pips can also be configured making it suitable for class change, start
and stop work, etc.
5. Each universal input has input live indicator.
6. Master volume, treble and bass controls.
7. 300 Watt version M2300M has four zone relay selector as standard.
NB: As supplied from the factory all zoned outputs are energised.
8. Internal option socket. Can be used to add frequency equaliser etc.
9. Music mute facility, which allows for music to be totally muted or ‘ducked’ to a pre-set level,
when paging operated.
10. Remote music mute DC input from time clocks etc.
11. Output stage protected by thermal shut down in event of unsuitable load.
12. Auxiliary stereo music input (internally mixed) to accept tuners, CD players or tape decks.
13. Power amplifier input phono connector to enable 2 amplifiers to be connected together to provide
10 inputs.
14. 24V DC output.
15. M2000M Mixer version has two 0dB balanced line level outputs to feed separate amplifiers.
Slave Amplifiers M2120S (120 Watt), M2300S (300 Watt)
1. Each amplifier has two balanced line inputs which have selectable priority and rear mounted
independent gain controls.
2. Priority selectable by DIL switch.
3. Internal option socket. Can be used to add frequency equalisers, etc.
4. Output level indicator.
5. Output stage protected by thermal shut down in event of unsuitable load.
6. 30V 1.5A output for powering mixers, etc.
Tuner Amplifiers M2060A (60 Watt), M2120A (120 Watt), M2300A (300 Watt)
1. These have the same facilities as the mixer amplifiers with the added facilities of an FM/AM
tuner.
2. The FM Tuner operates between 87-108 MHz and the AM between 525-1605 kHz.
3. Phase locked loop tuner with digital display of frequency and selected channel providing 7 FM, 7
AM and an auxiliary input for CD or tape.
- 3 -
Issue 2
SAFETY
I
MPORTANT NOTES
- DO’
S AND DON’TS
Ventilation
Always ensure adequate ventilation to the amplifier especially the 300 Watt version. Do not obstruct
ventilation holes in cover or base. The 300 Watt versions include internal fans that are temperature
controlled to prevent overheating, especially if the amplifiers are rack mounted and used for
continuous broadcast of music material. Should the amplifier exceed its safe operating temperature it
will automatically reduce its volume to a safe level thus allowing it to cool. Once cooled it will
operate normally without manual resetting.
AC Power Input - Danger High Voltage
Only connect to an AC 50-60 Hz 230V supply using the lead assembly supplied or an equivalent type
with a suitable IEC connector.
Always ensure that the amplifier is earthed.
Always unplug the power before removing the top cover.
100V Loudspeaker Output - Danger High Voltage
Ensure that the loudspeaker connections are suitably protected and cannot be touched. Always replace
output plug insulated covers.
Always ensure that the total speaker load does not exceed the rating of the amplifier used. If unsure
use an impedance meter to measure the unknown load. Using a multimeter selected to the resistance
range ensure that the speaker line is not connected to earth.
NB: As supplied from the factory a jumper lead is included on the rear of the M2300. This lead
energises the four output relays and enables the user to connect to any of the four zoned outputs.
Moisture
Do not allow water to come in contact with the amplifier and its external connections.
Cable Types
Always ensure that the correct cable type is used for the signal level.
A twin screened cable should be used for balanced inputs operating at mic or line level. Zone
selection and access control cables do not generally require screening and should not share the same
screen as the balanced input.
Loudspeaker output cables should be rated in excess of 100V and the cross sectional area to suit the
load without excessive power loss. Always ensure that output cables are kept as far away from input
cables as possible reducing the risk of instability.
Fuses
Always replace using the correct rating and type to ensure safe operation.
- 4 -
Issue 2
Mitre Integrated Technical Specification
MIXER
60 120 300
Rated output power
100V line 230V AC supply N/A 60W 166 Ohms 120W 83 Ohms 300W 33 Ohms
THD 1 kHz rated output
Aux input 230V AC supply Less than 0.5% typically 0.2%
Typical output power 1% THD
Aux input 230V AC supply N/A 80W 125 Ohms 150W 66 Ohms 340W 29 Ohms
Output regulation
(1 kHz 100V line) N/A Better than 1d B
Output voltages obtainable
(Pin selection) N/A 50 & 100V
Supply voltage AC 230V 50-60 Hz
Power consumption @ 230V
Quiescent (no external DC load)
Rated output power @ 1 kHz
20VA
N/A
12VA
150VA
18VA
300VA
26VA
700VA
Fuse protection
1 x AC supply 20 x 5 mm
2 x DC (amplifier) auto blade type
630mA(T)
1x1A(F)
1x5A(F)
2A(T)
5A(F)
3.15A(T)
10A(F)
6.3A(T)
20A(F)
1 x DC Aux output Self Reset table Fuse
Aux input phono stereo s ummed mono
Sensitivity
Frequency response -3 dB @
Signal to noise ratio
100mV @ 20k Ohms
40 Hz - 20 kHz
Better than 80 dB
Tone controls
Bass
Treble
± 12 dB @ 100 Hz
± 12 dB @ 12 kHz
Universal input (line)
Sensitivity
Frequency response -3 dB @
Signal to noise ratio
80mV @ 12K balanced
40 Hz - 18 kHz
Better than 70 dB
Universal input (Mic)
Sensitivity 600 µV balanced
Input impedance
Without phantom power
With phantom power 15V
12k Ohms
660 Ohms
Frequency respons e -3dB @ 40 Hz - 18 kHz
Common mode rejection ratio
50 Hz - 30 kHz Better than 60 dB
Signal to noise ratio terminated 200 Ohms Better than 60 dB
System busy output Open collector 0.5A @ 40V total max.
Aux line output leve l
Source impedance
0 dBm transformer isolated
100 Ohms
Power amplifier input
Sensitivity
Impedance
800mV
15K Ohms
Busy/restoration relay output 2 pole change-over 5A @ 100V max.
DC Aux output 30V @ 1.5A max.
4-zone relay output N/A N/A N/A 5A @100V max.
LED indicators x 5 1 per universal inpu t (indicates busy state) 1 indicates presence of 24V Aux
supply
Terminations
AC supply input
Power amp input
Aux signal input
Universal input
Alarm trigger & 0dB line output
Busy/restoration relay output
Loudspeaker line output
3-pin, DIN IEC 6A
1 x phono
2 x phono, Stereo summed mono
6-pin, Screw termina ted connector + 3-pin XLR
6-pin, Screw terminated connector
8-pin, Screw terminated connector
3-pin, Screw terminated connector
Dimensions (cm) (D x W x H) 340 x 430 x 90 340 x 430 x 132
Weight 7.1 Kg 11.2 Kg 12 Kg 18 Kg
- 5 -
Issue 2
Mitre Tuner Specification
FM tuning range 87-108 MHz
Sensitivity for 40 dB signal to noise ratio
(ref. to ±22.5 kHz) 20 dBµ typical
IF frequency 10.7 MHz
IF rejection @ 98 MHz 70 dB typical
Image rejection @ 98 MHz 80 dB typical
AM rejection @ 98 MHz 70 dB typical
Antenna input impedance 75 Ohms unbalanced
AM tuning range 525-1605 kHz
Sensitivity for 30 dB signal to noise ratio
(ref. to 30% modulation) 40 dBµ typical
IF frequency 450 kHz
IF rejection @ 1050 kHz 55 dB typical
Image rejection @ 1050 kHz 36 dB typical
AGC @ 1050 kHz 60 dB typical
Antenna input impedance To suit loop antenna
Pre-set channel selection 7 FM 7 AM 1 Aux
Tuned frequency indicator 4 7 segment LED displays
Channel indicator 1 7 segment LED displays
Memory battery back-up 90 days
- 6 -
Issue 2
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- 7 -
Issue 2
Mitre Slave
120W 300W
The Mitre Slave is equipped with two 0dBM balanced line inputs incorporating a priority switching
system. The priority is selected using a two-way dual in line switch. Switch ‘1’ when selected ‘on’
provides input 2 muting when 1 is accessed. Switch ‘2’ when selected ‘off’ enables the first input
irrespective of access conditions. When both switches are selected ‘on’ input 1 will override input 2.
Therefore it is possible to have both inputs mixing together or cascade priority depending on the
requirements, refer to rear panel drawing.
LED indicators on the front panel show clearly which input or inputs are busy and the channel gain
may be individually set using the rear panel controls. The output stage is protected against overload
conditions, i.e. short circuits etc., by means of sensing the current and voltage and presenting this error
signal to a drive limiter circuit. Should the amplifier be subjected to an abnormal load the input to the
power amplifier is limited to a safe level.
Over temperature protection is provided using sensors attached to the output stage heatsink. Should
the temperature exceed 90°C the input signal is reduced to a low level preventing permanent damage
to the amplifier. When the amplifier cools down, it will perform as normal without manual resetting.
For added reliability the 300 Watt version includes internal fans that will operate if the heatsink
temperature exceeds 70°C.
The inputs to the amplifier are presented on two separate four-way plug-in screw terminal connectors,
each connector provides a balanced audio input, ground and access DC control input. The output is
presented on a three-way plug/screw termination connector providing 50V or 100V output.
The front panel LED indicators include an output level status indicator consisting of four LED’s
indicating 5V, 25V, 50V and 100V maximum output level.
- 8 -
Issue 2
Mitre Slave Technical Specification
120W 300W
Rated output power
100V line 230V AC supply 120W 83 Ohms 300W 33 Ohms
THD 1 kHz rated output
230V AC supply Less than 0.5% typically 0.2%
Typical output power 1% THD
230V AC supply 150W 66 Ohms 360W 29 Ohms
Output regulation
1 kHz 100V line Better than 1 dB
Output voltages obtainable by pin selection 50 & 100V
Supply voltage AC 230V 50-60 Hz
Power consumption
Quiescent
Rated output power @ 1 kHz
18VA
300VA
26VA
700VA
Fuse protection
1 x AC supply 20 x 5 mm
2 x DC (amplifier) auto blade type
1 x DC Aux output 20 x 5 mm
3.15A(T)
10A(F)
2A(T)
6.3A(T)
20A(F)
2A(T)
Input type 2 x line balanced with priority gating
Input sensitivity 0.5V @ 40K Ohms balanced
Input common mode rejection ratio
50 Hz - 30 kHz
Frequency response -3dB @
Signal to noise ratio
Selectable high pass filter
Better than 40 dB typically 60 dB
40 Hz - 20 kHz
Better than 85 dB
200 Hz 12 dB/octave
DC Aux output 30V @ 1.5A max.
LED indicators Output level indicator 5V 25V 50V 100V
Inputs busy, i.e. accessed
Terminations
AC supply input
Line signal inputs
DC Aux output
Loudspeaker line output
3-pin
4-pin
2-pin
3-pin
DIN IEC 6A
Screw terminated connector
Crimp terminated connector
Screw terminated connector
Dimensions (cm) (D x W x H) 340 x 430 x 90 340 x 430 x 132
Weight 11.5 Kg 17.5 Kg
- 9 -
Issue 2
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- 10 -
Issue 2
M
ITRE INTEGRATED AMPLIFIER FEATURES
Universal Inputs.
Each of the universal inputs has a 6 way DIL switch to select the required facilities as shown below :
Note: Each universal input has to be accessed (by linking pins 3 and 4) in order to make the input live.
The green LED on the front panel illuminates when an input has been accessed.
Priority Selection
If priority is set to ‘ON’ then the input will override descending inputs.
The hierarchy in descending order is as follows: Input 1 – Overall Priority
Alarm Tone
Input 2
Input 3
Input 4
Music / Aux – No Priority
CONNECTOR
SPEAK SWITCH
PRESS TO
BUSY
INDICATOR
INPUT
0V (GROUND)
BUSY OPEN COLLECTOR OUTPUT 40V @ 0.5A MAX
BUSY INDICATOR S ETC.
+24V TO FEED MICR OPHONE PRE-AMP,
CLOSES TO 0V WH EN ACTIVE. SEE SWITCH 2 ABOVE.
ACCESS CLOSE TO 0V TO ACCESS INPUT.
BALANCED SIGNAL INPUT
SEE SWITCH 4 ABOVE
123456
ON
PHANTOM POWER
BOTH ON = 15V MIC PHANTOM POWER
BOTH OFF = NO PHANTOM POWER
SENSITIVITY
ON = MIC 0.6mV.
OFF = LINE 80mV.
CHIME
ON = CHIME WILL SOUND
WHEN INPUT IS ACC ESSED
OFF = NO CHIME
VOLUME RESTORATION/BUSY
ON = VOL REST RELAY & BUSY
OUTPUTS OPERATE WHEN INPUT
ACCESSED
OFF = VOL REST RELAY & BUSY
OUTPUTS WILL NOT OPERA T E
WHEN INPUT ACCES SED
PRIORITY
ON = THIS INPUT WIL L
OVERRIDE DESCENDING INPUTS
OVERRIDE DESCENDING INPUTS
OFF = THIS INPUT WILL NOT
AND WILL MIX
213456
- 11 -
Issue 2
Volume Restoration Relay.
This relay will energise whenever an input is accessed if the “Vol. Rest / Busy” switch (2) has been
selected.
The relay contacts can switch either an AC or DC signal providing it does not exceed 100V @ 5A.
Here are 3 examples :
Example 1: 3 Wire System to Override a Remote Auto Transformer Volume Control.
Example 2: Aux. Busy Indicator.
Example 3: Paging Only Output.
VOLUME
CONTROL
100V
50V
0V
AMPLIFIER
OUTPUT
+24V
SYSTEM BUSY
INDICATOR
0V
PAGING ONLY
100V
50V
0V
(OFFICES)
MUSIC & PAGING
(WORKSHOP)
- 12 -
Issue 2
Alarm, Chime and Aux. Line Output Connections.
Music Mute Control
The amplifier has an internal pre-set VR6 which controls the residual level of background music
during paging. For full muting VR6 should be turned fully clockwise. For partial muting VR6 should
be turned anti-clockwise to suit operational requirements. Once the priority microphone is deselected
the background music level will fade up gently to its original setting. The unit is supplied with muting
set to maximum.
FLOA TING LINE OUTPUT
SWITCH 1 2
AFTER MASTER
& TONE CONTROLS
& TONE CONTROLS
BEFORE MASTER
ON OFF
OFF ON
NOTE. DO NOT SELECT
BOTH SWITCHES TO ON
1234
SWITCH
CHIME SELECTION
34
NO CHIME OFF OFF
OFF
OFF
ON
ON
ON ON
1 NOTE CHIME
2 NOTE CHIME
3 NOTE CHIME
CHIME V O LUME
MAX
MAX
ALARM TONE VOLUME
ON
FLOATING LINE OUTPUT
0dB TRANSFORMER ISOLATED
OUTPUT TO FEED SLAVE
AMPLIFIER, TAPE RECORDERS ETC
0V (GROUND)
CONNECTOR
OUTPUT TO FEED
OTHER EQUIPMENT
SEE SWITCH 1&2
ALARM ACCESS, CLOSE
TO 0V TO ACCESS
ALARM TONE GENERATOR
RELAY COIL
AUX MUTE
213456
ALARM TONE
CLOSE TO 0V TO
TIME SWITCH ETC
MUTE AUX INPUT.
CLOSE TO SOUND
MUSIC
MUTE
VR6
PART VIEW O F PRINTED
BOARD CIRCUIT WITH
TOP COVER REMOVED
AUX VOLUME
CONTROL
MAX MUTE
- 13 -
Issue 2
Alarm Tone Generator.
The Alarm Tone Generator is configured when dispatched from the factory to produce a 1 second
alternating 500 and 900 Hz Dee-Daa sound.
However, it is possible to produce pulsed or continuous single frequency tones which could be used
for start and stop work, class change, etc. Will remain sounding until access switch removed.
Part views of printed circuit board with top cover removed.
When the Alarm Tone Generator is accessed it will provide a “Busy” output to all universal inputs and
energise the Volume Restoration relay.
JP21
C77
C76
R121
VR10 TP4
VR9
U6
C38
R103
TR1
C64
JP22
R104R105D8 D9
500Hz PIPS
900Hz PIPS
SET ALARM
5
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0
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9
0
0
H
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S
JP21
C77
C76
R121
VR10 TP4
VR9
U6
C38
R103
TR1
C64
JP22
R104R105D8 D9
500Hz PIPS
900Hz PIPS
SET ALARM
5
0
0
H
z
9
0
0
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S
FACTORY
SET
900Hz
FACTORY
SET
500Hz
JUMPER
LINK
CONTIN UOUS 900H z TO NE
CONTIN UOUS 900H z PIP S
JUMPER
LINK
JP21
C77
C76
R121
VR10 TP4
VR9
U6
C38
R103
TR1
C64
JP22
R104R105D8 D9
500Hz PIPS
900Hz PIPS
SET ALARM
5
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JP21
C77
C76
R121
VR10 TP4
VR9
U6
C38
R103
TR1
C64
JP22
R104R105D8 D9
500Hz PIPS
900Hz PIPS
SET ALARM
5
0
0
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CONTIN UOUS 500H z TO NE
JUMPER
LINK
CONTIN UOUS 500H z PIP S
- 14 -
Issue 2
Mitre FM / AM Tuner Amplifier.
The tuner provides 7 x FM, 7 x AM (MW) and 1 x Aux. programme.
Front Panel View. Rear Panel Time Switch Connections
Tuning a Channel.
Press the “Programme” switch until the channel you wish to tune is displayed by the Programme
indicator and the FM / AM indicators. The Frequency indicator will indicate the original setting.
By using the “UP” or “DOWN” switches step to the required frequency.
The Programme indicator will now pulse inviting you to store the new selection by pressing the
“Store” switch using a small screwdriver or similar tool through the front panel hole.
After storing, the Programme indicator will stop pulsing.
Press the “Programme” switch once and the Programme indicator will indicate the next programme.
To tune repeat the above until all channels have been set.
After 7 channels have been selected the Aux. input is selected. The Programme indicator displays an
“A”.
When installing this unit it is important to connect a suitable aerial.
A dipole or a multi-element directional antenna, mounted externally should give optimum FM
reception. For AM a loop, long whip or long wire aerial will suit.
Both FM and AM aerials should be wired using a coax type cable, and the cable kept to a minimum
length for best results.
Please note. An internal battery supports the memory of the tuner module. If the module fails to
operate correctly when first switched on then the battery voltage may have dropped too low to
maintain the memory. Once this has happened the tuner module must be reset before it can be
reprogrammed.
To reset the tuner the unit must be turned off and the “STORE” button held in whilst switching the
power back on. This will restore all pre-set stations to their default settings of 89.1MHz for FM
stations and 909KHz for AM stations.
up
down
programme
programme
STORE SWITCH
VIA FRONT PANEL HOLE
FM=MHz
AM=kHz
frequency
am
fm
FLOATING LINE
OUTPUT CONN E CT O R
0V (GROUND)
CONNECTOR
AUX MUTE
213456
CLOSE TO 0V TO
USING TIME SWITCH ETC
MUTE AUX INPUT / TUNER.
Connect the Time Switch between pin 6 and 0V
(pin 3) to mute the Tuner.
- 15 -
Issue 2
M
ITRE MIXER
The Mitre Mixer has all of the features of the Mitre Integrated Amplifiers but instead of producing a
100V line output to drive speakers directly, the output is a 0dB balanced line output to drive other
amplifiers.
The output is presented on two paralleled XLR connectors.
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- 16 -
Issue 2
Example Insta llatio ns Wit h Wiring Diagram s.
The following drawings show examples of how to connect amplifiers using the numerous facilities
included in them.
NB. As supplied from the factory a jumper lead is included on the rear of the M2300. This lead
energises the four output relays and enables the user to connect to any of the four zoned outputs. If
any output zones are not required the relevant ‘Group Select’ DIL switch should be set to ‘OFF’.
FIGURE 1 (Page 18) - 3 Zone : Music only, Paging only, and Music and Paging.
This example sh ows the re com mende d me thod of ob taining th e amp lif ier o utpu t i.e. Mus ic an d Pag ing , an d
also provides tw o switche d outpu ts for Music on ly and Pag ing only .
The Paging only output is useful for in stallat ions tha t requir e music to be broadcast to a factory / ware house
but not the offices. However, Paging announcements will be broadcast to both areas.
To obtain this facility the “Vo l. Rest / Busy ” switch on each micropho ne inp ut us ed must be se t to “ ON ”.
FIGURE 2 (Page 19) - 2 Zones. Music and Paging and Paging Only.
The M2060 and M212 0 do not inc lude the 4 zo ne ou tpu t relay se lecti on.
This example sh ows h ow pag ing on ly outpu t may be obta ined usi ng the i nter nal Vol. Res t r e lay which
energises when the micr ophone s are accessed .
If output zoning is required an external relay selector e.g. B41R may be used (see fig 3).
FIGURE 3 (Page 20) – 4 Zone: Music and Paging.
This example shows a simple installation using the M2120M or M2060M, a B41R Relay Set and a 4 zone
BDM Microphone to provide 4 zone s with Mu sic and Pag ing.
FIGURE 4 (Page 21) - 4 Zones. 3 with Paging and Music, 1 Paging Only.
This example shows a typical 4 zone system using the M2300 providing the following features:
a) Single zone all call mic rop hone (BDM 201 ) overrid ing all other inputs,
b) 2 Tone alarm signal to all zones overriding descending inputs,
c) 2 off 4 zone microphones (BDM 204) with 3 note chime overriding descending inputs,
d) Background music broadcast to a ll zones exce pt zone 3 “O ffices” ,
e) Local vo lume con trol for zone 4 whic h i s over ridde n whe n a pag ing a nnou nceme nt i s ma de.
f) Background music se lecte d on- off by a time s witc h.
The music is selec ted to t he req uired zone s by swi tching “O n” the appr opria te grou p se lec t sw itche s.
If more than 4 zones are required it is po ssib le to use 2 or more M2300 in puts wir ed in paralle l.
FIGURE 5 (Page 22) - 4 Zones. Using 4 Am plifier s.
In this example each zone is ser ved by a se parate ampl ifier and zone se lect ion is a ccomp lished u sing input
access. A music source i.e. CD, tape etc. may be injected into the requ ired zonal amplifiers which would only
be overridden whe n that partic ular zone is paged and not interrup t other zone s.
The first input is an all zone call but the other two can select the zone they wish to page.
This example only shows four zones but up to sixteen zones would be possible using this technique.
FIGURE 6 (Page 23) - 6 Zones . Using 1 Mixer Am plifier and 2 Slave s.
This example sh ows how both input and outpu t access zone selection can be ac hieved.
The slave amplifiers have two 0dB line inp uts whic h incor porate a pr iority acces s sy stem allowing the music
to be overridde n w hen paging .
Input 1 of eac h s lave is fe d fro m the mas ter a mpl ifier via i ts 0dB li ne outpu t. T his outpu t pr ovid es a signal
before the mas ter vo lume a nd tone c ontro ls (p re-fade), bu t can be se lected to after (pos t-f ade) if re quir ed by
means of the re levant DIL swi tch.
- 17 -
Issue 2
O
BTAINING A
600W S
INGLE LOUDSPEAKER OUTPUT
FIGURE 7 (Page 24) - 1 Zone of 600W Using 2 Slave Amplifiers
Shows how two 300W slaves may be configured to produce 600 Watts into a single load. We do not
recommend paralleled outputs because both amplifiers would have to possess identical gain and phase
throughout the audio frequency range. The two 50V outputs are connected in series to produce 100V
to the load and small changes in gain will not cause any problems. Both amplifiers must be of the
same power output rating and the gains are set to produce the same output voltage within 5%. If in
doubt set both to maximum.
FIGURE 8 (Page 25) - 1 Zone of 600W Using a Master and Slave Amplifier
Shows how a 300W slave may be connected to a 300W integrated amplifier to produce 600 Watts into
a single load. To obtain an output from the integrated amplifier all zone selection relays are energised
by applying 0V to the ‘ALL’ terminal of the zone selector. The slave amplifier obtains its input signal
from the floating line output selected to ‘post master V/C’ and must be in the correct phase. As with
the previous example the outputs are wired in series. The slave volume (gain) must be set so both
amplifiers produce the same output voltage within 5%. Input 1 of the slave is enabled by selecting
both DIL switches off therefore a link is not required between access and 0V.
FIGURE 9 (Page 26)
Shows how 2 300W amplifiers may be connected to provide 10 inputs and 600W output using the
power amplifier input socket.
FIGURE 10 (Page 27)
Slave amplifier rear view showing controls and connections.
FIGURE 11 (Page 27)
Shows where to position self-adhesive cable ties to help cable management.
FIGURE 12 (Page 28)
Rack and wall mounting adapters.
FIGURE 13 (Page 28)
Stacking bracket.
R
EMOVING THE COVER
Ensure that the AC power has been unplugged.
To remove the cover from the Mitre, remove all screws from cover. There are 9 x M3 screws and 4
No.4 self-tapping screws.
Lift cover from chassis.
Re-assembly is the reversal of the above, but please ensure the No.4 screws are refitted to the
extrusion rails at the front of the amplifier.
- 18 -
Issue 2
0
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- 19 -
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- 21 -
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- 23 -
Issue 2
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- 24 -
Issue 2
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- 25 -
Issue 2
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- 26 -
Issue 2
6
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- 27 -
Issue 2
0
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- 28 -
Issue 2
REFIT SCREWS AND REPEAT
FOR OTHER SIDE.
2U CODE = M2RACK
3U CODE = M3RACK
CODE = MWALL
REPEAT FOR OTHER SIDE.
3 X HOLES FO R MOUNTING TO WALL
RECOMENDED SIZE = No10
AND AL IGN RA C K BRACKET.
AND ALIGN WALL BRACKET. REF IT SC REWS AND
RACK & WALL MOUNTING ADAPTORS
REMOVE 3 x M3 SCREWS
REMOVE 2 x No4 SCREWS,
No4
No4
M3
M3
M3
FIG 12.
TO RACK MOUNT M2000 ,
TO WALL MOUNT M2000, RE MOVE 3 x M3 SCREWS
BASE UNIT AND INSERT SCREW IN TO REA R PANEL.
REPEAT FOR OTHER SIDE
SLOT IN COVER. (2 OFF )
INSERT BRACKETS INTO
REAR
OF
COVER
FIG 13.
ST ACKING A DAPTO RS CO DE = M2000SB
ST ACK M2000 ON TOP OF
1
Ecr 1231 addendum for mitre iss1.doc
FLOATING LINE OUTPUT
0dB TRANSFORMER ISOLATED
OUTPUT TO FEED SLAVE
AMPLIFIER, TAPE RECORDERS ETC
0V (GROUND)
CONNECTOR
OUTPUT TO FEED
OTHER EQUIPMENT
SEE SWITCH 1&2
ALARM ACCESS, CLOSE
TO 0V TO ACCESS
ALARM TONE GENERATOR
RELAY COIL
AUX MUTE
ALARM TONE
CLO SE TO 0V TO
TIME SWITCH ETC
MUTE AUX INPUT.
CLOSE TO SOUND
CONNECTOR
SPEAK SWITCH
PRESS TO
BUSY
INDICATOR
INPUT
0V (GROUND)
BUSY OPEN COLLECTOR OUTPUT 40V
@
0.5A MAX
BUSY INDICATORS ETC.
+24V TO FEED MICROPHONE PRE-AMP,
CLOSES TO 0V WHEN ACTIVE. SEE SWITCH 2 ABOVE.
ACCESS CLOSE TO 0V TO ACCESS INPUT.
BALANCED SIGNAL INPUT
SEE SWITCH 4 ABOVE
ADDENDUM
Please note -
The orientation of the six-way plug on pages 10,12 and 14 are reversed.
Page 10
Pages 12 & 14
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