In the two amplifier mode, one amp serves as the paging amplifier and the other as the background music amplifier.
The paging or music signal is sent to the external amplifier, returned and the amplified signal is switched by the ZPI-4
to the correct zone or zones.
Advantages: Any size amplifier may be used when driving 70V
speakers, only (2) amplifiers (or one stereo amp) are required for 4
zones, background music is selectable per zone, and the non-paged
zones will continue to to get music during a page.
Limitations: The paging amp needs to be limited to 200 watts and
the music amp needs to be limited to 70 watts when switching 8 ohm
speaker loads, each speaker zone is limited to 8 ohms minimum
impedance and the amp must have the ability to drive the speakers
of all zones. (Example: 4 zones at 8 ohms per zone equals a 2 ohm
load during an all call.)
To set up the ZPI-4 in the two amplifier mode:
1. Hook up the ZONE 1 screw terminals to the
speaker(s) for Zone 1.
2. If background music is to be enabled on this zone,
ensure that the ZONE 1 music shunts are in place, covering both pins.
If not, remove the shunts.
3. Repeat steps 1 and 2 for each remaining zone.
4. Hook up the optional paging amp and the optional music amp as shown.
5. Set DIP switch 1 to OFF.
In this mode, one external amplifier handles both paging and back-
ground music. An internal relay capable of switching between paging
signal and music signal sends input to this amp, the amplified signal is
returned and the ZPI-4 sends it to the correct zone(s).
Advantages: Any size amplifier may be used when driving 70V
speakers, only one amplifier is required.
Limitations: The amplifier needs to be limited to 200 watts, each
speaker zone is limited to an 8 ohm minimum impedance, the amplifi-
er must be able to drive the speakers of all zones (Example: 4 zones
at 8 ohms per zone equals a 2 ohm load during an all call); if back-
ground music is used, all zones will receive background music and it
will be muted in all zones during a page.
To set up the ZPI-4 in the single amplifier mode:
1. Turn Dip switch 1 on. This tells the ZPI-4 that it is
operating in the single amplifier mode.
2. Hook up the ZONE 1 screw terminals to the speaker(s) for Zone 1.
3. Repeat step 2 for each of the remaining three zones.
4. Hook up the optional paging amp as shown.
Music Amplifier
Paging Amplifier
Input
Output
Input
Output
B. Two Amplifier Mode
Paging Amplifier
Input
Output
C. Single Amplifier Mode
(8 pages)
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