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947032

 

Consult your Valcom distributor for assistance in 
selecting a control unit and power supply. 
 

Nominal Specifications for the 
V-1048M 

 

 

Input Impedance: 

45 Ohm 

 

Limitations of the V-1048M

 

 

Two talkback speakers maximum per zone. 

 

800 feet maximum cable length to speaker 
NOTE:  Do not split pairs to speakers. 

 

Do not use talkback in noisy areas (80dB or 
greater). 

 

Coverage of the V-1048M

 

The distance you can be away from a speaker and 
still have good talkback depends on the type of 
speaker and ambient noise level. 
 
The speaker should be as close as possible to the area 
where talkback is desired.  It should not be mounted 
close to, or pointed at, noise producing equipment 
such as fans, air conditioners, machinery, or 
compressors. 
 
The chart to the right shows maximum talkback  
distances relative to the noise level of the 
surroundings.  

 
Remember:  The speaker is no better than 
your ears.  If you can not carry on a 
conversation at normal voice levels over the 
required talkback distance, then talkback 
page equipment will not function 
satisfactorily. 
 

Cabling for the V-1048M

 

Connections should be accomplished using regular 
twisted pair wiring.  Do not split pairs.

 

 

 

Connections for the V-1048M

 

Connect station or other suitable wire to leads as 
follows: 

 

MOUNTING OF HORN

  

(All Models) 
Attaching Speaker to Base

 

NOTE:  For ease of installation, the base can be 
attached to the speaker before or after the base is 
mounted. 
 

 

Loosen position adjustment knob. 

 

Insert the ball of the base into the socket of the 
speaker. 

 

Tighten the position adjustment knob.  

 

Mounting

 

Mount the horn to a suitable surface using the 
hardware provided.  These units can be mounted to a 
wall, a beam or an electrical box. 
 

 

Mount the base to a wall using the two holes 
provided.  Knockout holes are provided for 
punch out should additional holes be desired. 

 

 

A "C" clamp is provided with the horns to allow 
mounting to a beam.  Place the bolt through the 
hole in the bottom of the base to secure the "C" 
clamp to the beam (See Figure 1).  It is suggested 
that the horn be mounted to the underside of the 
"I" beam to provide maximum positioning 
adjustments. 

 

 

Connection to an electrical backbox is 
accomplished by channeling wire through the 
ball of the base and making appropriate 
connections.  The base has holes punched for a 
double-gang square box, but by punching out 
additional knockout holes, the base can be 
mounted to a single-gang or octagon box.  (See 
Figure 2). 

 
The horns may be rotated or moved up and down to 
obtain the desired position by loosening the knob at 
the bottom of the unit (see both figures) 
approximately 1 turn.  Make required adjustments 
and re-tighten knob. 

Machine
Shop
(Noisy)

90

80

70

60

50

10'

20'

30'

40'

50'

Shipping
(Moderate)

Waiting
Rooms
(Quiet)

Talkback not recommended above 80dB

TYPICAL REPLY DISTANCE CHART

Maximum Talkback Reply Distance

Tip (White)

Ring (Black)

Out

Common

Connections to
a V-1048M

VALCOM

HANDSFREE
TALKBACK

PAGE

CONTROL

UNIT

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