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TEL
MIC
BAL
GND
+
MUSIC
MUTE
MUSIC IN
BRIDGING
TR
MODEL TPU250
250 WATT AMPLIFIER
ALC
TEL VOLUME
MIC VOLUME
BOGEN COMMUNICATIONS
GND
MUSIC
IN
CONTACT
RING
TEL
RING
APHEX
LOCK
White -
Green -
Red - MIC + ‘MIC BAL’
Black - MIC - ‘MIC BAL’
Microphone
Cable
Shield - GND
Music Input A single RCA connector and screw terminals are provided for the connection of a
background music source.The music input is a mono unbalanced input, so the music
source’s output should be unbalanced and mono.If a balanced input is needed, use a
Bogen Line-Matching Transformer WMT1A (sold separately) to balance the music
input.The WMT1A is also effective in breaking ground loops that cause hum.
Microphone Input A high gain, low impedance microphone input is provided in this amplifier. It is
designed to work with microphones like Bogen’s MBS1000 microphone. Connect
the microphone's black wire to the amplifier's "-" (negative) terminal under the MIC
BAL connections. Connect the microphone’s Red wire to the "+" (positive) terminal.
Connect the shield wire from the microphone to the adjacent GND terminal.
Two conductor shielded microphone wire should be used to extend the cable from
the microphone. 22 AWG shielded, twisted pair speaker cable will also work.When
extending microphone cable, be sure to connect the shields of the microphone cable
to the extension wire.
Page 7 of 12
Figure 5: Connect Microphone to Telephone Paging Amplifier
Bogen
MBS1000
MIC
MUSIC
MUTE