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25-Volt Retrofit Applications

Valcom MultiPath supports both talkback and one-way speakers. In the case of

talkback, the system is designed and optimized for use with superior 45-ohm

voice coil speakers. 45-ohm talkback technology is deployed in most mission

critical intercom applications such as nurse call, etc. Occasionally, however,

when outdated intercoms are slated for replacement, we are asked if the existing

25-volt speakers may be utilized with the MultiPath system.

1) Since the MultiPath system has been optimized for 45-ohm speakers, the

best solution for retrofits is to replace the existing speakers. Our V-

C806PK Ceiling Speakers, V-WTGY Wall speakers and V-CTL Lay-In

speakers are very cost effective for use in retrofit and new installations.

Existing call in buttons may not be compatible with the MultiPath Intercom,

however, our V-2972PK Call Switches are also very cost effective for use

in retrofit and new installations.

2) Existing speakers will most likely have suffered deterioration from age and

environment. If customers are replacing their intercom, odds are it is

because it does not work to their satisfaction – this may very well be a

result of the existing system speakers.

3) We have seen instances where customers have been forced to use

existing 25-volt speakers for retrofits. In these cases we suggest utilizing

the XP-TCM12 25-volt station cards. You may also utilize V-TCM 45-

ohm station outputs by changing the tap setting of the existing 25-volt

“talkback” speakers to be between the 1 and 2 watt taps (not using the

common). Results may vary.

4) If attempting to use existing wiring:

a. Be aware that there are problems associated with terminating

heavy gauge cable on 66 blocks.

b. The wiring may not provide the needed number of conductors for

your application.

c. The quality of the wiring, and its installation will not be under your

control and may have an adverse effect on the quality of the

completed system.

d. 25.5-volt speaker connections should be made with appropriately

sized shielded wire. 20 AWG is adequate for 25.5-volt speakers

used for talkback. 25.5 volt one way zones will require wire sized

for acceptable loss vs. speaker load vs. distance.

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