Digital Acoustics COMTR4070-WA User manual

COMTR4070-WA
Getting Started Guide
Introduction
The optional 70V audio transformer for the IP7-SS40 enables an
IP7-SS40 Amplifier to:
•Drive one or more speakers, each with its own 70V transformer
•Install the speakers up to 3000’ away from the IP7 Amplifier
•Set an individual speaker’s relative volume using its transformer
taps
Use the TalkMaster®software to adjust the volume level of the IP7-
SS40. Volume level 6 is the recommended maximum

To install the optional 70V transformer:
•Mount the transformer next to the IP Amplifier. Optional DIN
clips are provided
•Connect the Black 8Ω and the White COM leads from the
transformer to the J2-6 and J2-7 terminals (SPKR 8Ω+ and SPKR
8Ω-) on the IP7 (polarity independent)
•Connect the Black 70V and Red COM to the speaker
distribution line

Speaker Installation Guidelines
•Each speaker must have its own 70V transformer
•Connect the speaker’s transformer to the distribution line using
the 70V setting and the appropriate wattage to set the speaker’s
relative volume
•Do not mix Speakers tapped for 25V with a 70V distribution line
•Make sure to maintain the same wiring polarity between each
speaker
•All Speakers must be wired in parallel (see diagram below)
•When using transformers, the total wattage available from the
IP7-SS40 must be reduced to account for transformer loss. The
IP7-SS40 has 30 watts available
•When the wattage settings from each speaker on the 70v
distribution line are added together, the total cannot exceed 30
watts
•The following guidelines should be used for selecting Speaker
Wire
IP7
70V 70V 70V 70V
40 Watt - 70V
Transformer
Distance
Wire Gauge
1’ - 500’
18 AWG
501’ – 1000’
16 AWG
1001’ – 2000’
14 AWG
2000’ – 3000’
12 AWG
70v distribution line using parallel wiring

IP7 and Digital Acoustics® are trademarks of Digital Acoustics LLC.
Other trademarks are the property of their respective owners.
COMTR4070-WAGSG - 2018-03-21- All Rights Reserved ©2022
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