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Connections
70V/100V
This configuration creates a stereo 70V speaker
zone. (30W/channel) A 70V/100 V system utilizes
speakers with special taps that set the wattage/
volume of each speaker.
70V/100V speaker system are wired using a
daisy-chain configuration where the amp feeds a
speaker, then that speaker connects to the next
speaker and so on.
When setting an 0E-IA1250 zone for 70V/100V,
be sure to accurately calculate the total wattage
required and not exceed the 0E-IA1250 70V/100V
zone's output, 30W per channel in 70V/100V mode.
Typically 70V amp power requirement can be
calculated by adding the total of the tap wattage
set for all speakers to be connected to a 70V/100V
zone and multiplying it by 1.2. This will allow
roughly a 20% loss of efficiency, typical for this type
of system.
If the total wattage exceeds 30 Watts for a 70/100V
zone, reduce the load to any given zone by
connecting 70V/100V speakers to multiple zones
set to 70V/100V to safely distribute the load.
1. 70V/100V High Voltage Speaker Output - Set
to 70V if 0E-IA1250 AC Voltage Select switch
is set to 110~120VAC. Set to 100V if 0E-IA1250 AC Voltage Select switch is set to 220~240VAC. This
setting will affect all zones set to 70V/100V.
2. Stereo/Bridged Switch - Set to the Stereo position.
3. 8Ω/4Ω-70V/100V Switch - Set to the 70V/100V position.
4. Speaker Connections - Connect the right 70V distribution line +/- wires to the right 70V/100V
+/- terminals as shown in: 70V/100V Connection. If configuring stereo, Repeat for the left channel
speaker.
Connect the right channel +/- distribution lines to the IN terminals on the first 70/100V speaker. Repeat
for the left channel.
Connect the right/left channel +/- distribution lines to the OUT terminals on the first 70/100V speaker.
Connect the right/left channel +/- distribution lines to the IN terminals on the next 70/100V speaker.
NOTE 1: Speaker terminals may not be specifically marked IN/OUT.
NOTE 2: In a 70/100V system +/- polarity is not critical in same way as in a 4/8 Ohm system. But it is
critically important that the connections be consistent, that is, plus to plus, minus to minus.
5. Zone Line IN - Connect the L & R line level OUT on the zone audio source to the appropriate zone L &
R LINE IN.
All manuals and user guides at all-guides.com
Distribution Lines
for all 70V/100V
Zones. See text.
Stereo/Bridged
Set to: Stereo
13
Low/Medium Power
70V/100 Speakers
Right
OUT
IN
Right
OUT
IN
70V/100V
Set 70V/100V
Right
Switch
70V/100V Connection
Left
70V Speaker
Parallel IN/OUT
Left
70V Speaker
Parallel IN/OUT
70V/100V
-/+ Terminals
8Ω/4Ω
70V/100V Switch
Set to: 70V/100V
Left
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