TOA Electronics EX-16 manual Connection of the Speaker Station, Speaker Volume Adjustment

3.10 Connection of the Speaker Station

In the EX-16, instead of using a station, a speaker for one-way conversation can be installed using a jumper in the LAU-16.

This is possible at each station position on the LAU-16.

3.10.1 Wiring Procedure

(a)First, determine the number of station speakers to be installed. (Any number of station speakers may be connected within the limits of the station numbers from No. 2 to No. 17.)

(b)Use the Wiring Instruction Chart to determine the LAU No. and Jumper No. corresponding to the station number. (See page 24.)

(c)Remove the corresponding LAU-16 from the mother board.

(d)Connect the corresponding jumper points with the jumper wire. (See page 24.)

3.10.2Speaker Volume Adjustment

1.Speakers with an impedance of 600 ohms or more may be used without the need for a transformer.

If it is desired to use lower impedance speakers, a transformer should be used to assure proper impedance matching.

2.Volume may be controlled only when:

(a) a matching transformer is used.

To exchange

(b) a resistor is connected.

To exchange

The Rs value should be decided in accordance with the speaker impedance so that the volume is on a suitable level.

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