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page mute/pass through
The Page Mute feature allows you to connect the TeachLogic amplifier to the school paging/intercom
system for muting purposes. A simple connection between the in-classroom paging speaker (typically
25v, 70v or 100v) and the TeachLogic page input will mute all the inputs and pass the page to the
speakers connected to the TeachLogic amplifier. System resumes audio (slowly ramping up volume)
6 seconds after no additional page signal is detected.
KEY SPECS (based on 25 V paging systems)
•
Page signal required to activate mute function: 6.0 V
•
The impedance of the IMA-120 is 160 Kohms in the 25V switch position, and 180 Kohms in the 75
and 100V switch positions.
•
Power draw = 0.004 Watts or less (power = voltage*voltage/impedance, or 25*25/160,000).
CONNECTION
1. Tap/Splice page speaker’s wire and connect to our amp via 2-pin Phoenix connector.
2. Determine the signal level of the paging system (25v, 70v, or 100v) and set the slide switch to the
appropriate speaker level setting.
PASS-THRU FUNCTION
The amplifier will pass the paging audio through the classroom audio speaker(s) connected to it.
Note that you may use the classroom audio system speakers in addition to or in lieu of dedicated
paging speaker.*
* IMA-120 Matrix only passes page audio through speakers when the amplifier is powered.
Figure I: impedence selector /
page input Phoenix Connector
Figure J: page sensitivity
control
3. With the TeachLogic amplifier turned ON, send a page signal through the page input.
4. Adjust the page input SENSITIVITY control, located on front panel, so that an incoming page/
intercom signal will override any audio (mics, line, etc) plugged into the TeachLogic amplifier.
