Z4-8MK4 Installation and User Guide v1.2 19
Zone Offset
The purpose of the Zone Offset is to permit Cloud PM
paging microphones to address a differently-numbered set of
zones from their normal assignment. Zone Offset is generally
used in systems employing more than one Zone Mixer,
interconnected using the THRU port of the Digital Paging
Interface of one Mixer.
PM Series microphones support up to 16 zones, whereas
the Z8MK4 and Z4MK4 only support eight and four zones
respectively. For example, to permit a PM16 to page Zones 9
and higher in a system utilising two Z8MK4s, a xed numeric
offset of 8 should be set in the “second” Z8MK4 (and left at
the default value of 0 in the “rst”). With the rst Z8MK4
feeding audio to Paging Zones 1 to 8 and the second to Paging
Zones 9 to 16, correct paging of the higher-numbered Zones
will result.
Please see the Application Examples section in the Appendix
of this Guide (page 24) for an example of such a system.
Zone Offset is set by two sections of internal motherboard
DIP switch SW2. Zone Offsets of 0 (the factory default), 4, 8
or 12 may be selected by the two binary-weighted switches,
as summarised in the table below:
ON
1
32
ON
OFF
Sets buss
termination
Set Zone Offset
SW2
ZONE OFFSET SW2/2 SW2/3
0 OFF OFF
4 OFF ON
8 ON OFF
12 ON ON
Refer to “PCB jumper location and settings” on page 26 for
details of SW2’s location.
Zone Outputs
In normal operation, the music level in each zone will be set by
the front panel Music Level control, or by a corresponding
control on a remote plate. Follow the procedure described
previously (page 17) to adjust the music level in each zone.
EQ
The various zones in a building often have different acoustic
properties, and may also have different models of loudspeaker
installed. The Z4MK4 and Z8MK4 are tted with HF and LF EQ
adjustments ([14] on page 9) for the music signal at each
zone output to enable the audio frequency response to be
best matched to each zone. The controls should be adjusted
by listening; up to 10 dB of cut or boost at 10 kHz (HF) and
50 Hz (LF) is available. Note that these EQ adjustments do
not affect the frequency response of microphones or paging.
Priorities
The Z4MK4 and Z8MK4 offer several options for determining
what happens to music signals when announcements are
made. The options are selected via internal jumpers, and
should be set to suit the requirements of the installation
when the system is installed. See page 26 for location of
the internal jumpers.
Mic 1/Mic 2 priority
By default, fully automatic, voice operated priority is provided
for the microphone inputs. When either microphone is used,
all music signals will attenuate by approximately 30 dB; after
the announcement, the music signals will restore smoothly to
their former level, over a period of 3, 6 or 12 seconds.
The Mic 1/Mic 2 priority over music can be disabled on a per-
zone basis by setting J6 on the relevant zone sub-board to the
‘OFF’ position. The release time may also be set on a per-zone
basis to 3 s or 6 s by moving J3, or to 12 s by removing J3
altogether. Note that the release time setting will apply to all
music ducking, regardless of which priority setting initiates it.
Paging mic priority
When an announcement is made via either the paging mic
input or the Digital Paging Mic Interface, it has full priority
over both the music signals and any microphones in use via
MICROPHONE 1 and MICROPHONE 2 inputs. For
most installations this will be a required priority for safety
reasons, but may be overridden (see following page).
Paging priority can be triggered either by voice detection or
by the grounding of the access contact; the sub-board jumper
J5 should be set to ‘VOX’ for voice triggering (the default)
or set to ‘SW’ for access contact triggering. If PM Series
multi-zone paging microphones form part of the system, J5
will usually be set to ‘SW’; they will operate satisfactorily in
VOX mode, but this leaves the possibility that the priority
may be released (which will cause the music to resume) if the
announcement has prolonged gaps for any reason.
When multiple PM Series paging microphones are in use, it is
possible for one to have a priority over the others. This is a
function of the microphones, not of the mixer; please consult
the PM Series User and Guide for more information.
Note that if both the Digital Paging Mic Interface and the
Paging Mic Input are in use – e.g., with a Cloud PM Series mic
and a third-party microphone using the analogue interface
- the Digital Interface always has priority. If announcements
are made from both microphones simultaneously, the mic
connected to the analogue interface will not be heard.
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