- 16 -
Issue 2
Example Installations With Wiring Diagrams.
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 shows the recommended method of obtaining the amplifier output i.e. Music and Paging, and
also provides two switched outputs for Music only and Paging only.
The Paging only output is useful for installations that require 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 “Vol. Rest / Busy” switch on each microphone input used must be set to “ON”.
FIGURE 2 (Page 19) -
2 Zones. Music and Paging and Paging Only.
The M2060 and M2120 do not include the 4 zone output relay selection.
This example shows how paging only output may be obtained using the internal Vol. Rest relay which
energises when the microphones 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 zones with Music and Paging.
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 microphone (BDM 201) overriding 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 all zones except zone 3 “Offices”,
e)
Local volume control for zone 4 which is overridden when a paging announcement is made.
f)
Background music selected on-off by a time switch.
The music is selected to the required zones by switching “On” the appropriate group select switches.
If more than 4 zones are required it is possible to use 2 or more M2300 inputs wired in parallel.
FIGURE 5 (Page 22) -
4 Zones. Using 4 Amplifiers.
In this example each zone is served by a separate amplifier and zone selection is accomplished using input
access. A music source i.e. CD, tape etc. may be injected into the required zonal amplifiers which would only
be overridden when that particular zone is paged and not interrupt other zones.
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 Amplifier and 2 Slaves.
This example shows how both input and output access zone selection can be achieved.
The slave amplifiers have two 0dB line inputs which incorporate a priority access system allowing the music
to be overridden when paging.
Input 1 of each slave is fed from the master amplifier via its 0dB line output. This output provides a signal
before the master volume and tone controls (pre-fade), but can be selected to after (post-fade) if required by
means of the relevant DIL switch.
