Bogen Stereo Amplifier TPU250 User Manual

TPU250  
Telephone Paging Amplifier  
Installation and Use Manual  
© 2000 Bogen Communications, Inc.  
All rights reserved. 54-5900-01r1 0001  
 
Contents  
Page  
INTRO DUCTIO N ..........................................................................................................................4  
PACKAGE CO NTENTS..............................................................................................................4  
INSTALLATIO N ..............................................................................................................................5  
Mounting ............................................................................................................................5  
Wall Mounting........................................................................................................................5  
Rack Mounting ......................................................................................................................5  
W IRING CO NNECTIO NS ........................................................................................................6  
Input W iring......................................................................................................................6  
Tel Input..................................................................................................................................6  
Music Input ............................................................................................................................7  
Microphone Input ..................................................................................................................7  
Night Ringer Connections ....................................................................................................8  
Bridging Inputs ......................................................................................................................8  
Input Cover Replacement ....................................................................................................8  
O utput W iring ................................................................................................................9  
Speaker Connection ..............................................................................................................9  
Additional Power Amplifier............................................................................................................10  
Line-Matching Transformer WMT1A Connector ..............................................................10  
Output Cover Replacement................................................................................................10  
O PERATIO N ..................................................................................................................................11  
Indicators ........................................................................................................................11  
Controls ....................................................................................................................11-12  
Page 3 of 12  
 
Telephone Paging Am plifier  
POWER  
PEAK LEVEL  
APHEX  
TREBLE  
BASS  
VOX  
RINGER VOLUME  
MUSIC MUTE  
MUSIC VOLUME  
MIC VOLUME  
TEL VOLUME  
ALC  
MODEL TPU250  
250 WATT AMPLIFIER  
BOGEN COMMUNICATIONS  
APHEX  
MUSIC IN  
BRIDGING  
MUSIC  
MUTE  
MIC  
BAL  
+
MUSIC  
IN  
CONTACT  
RING  
TEL  
RING  
TEL  
GND  
GND  
T
R
70V 25V COM GND  
Figure 1: Telephone Paging Amplifier  
Introduction  
This document describes the Bogen TPU250 250-watt Telephone Paging Amplifier  
(see Figure1).This is a full-featured, wall-mounted amplifier that provides inputs for  
dry loop 600-ohm telephone page signal, background music source, and low  
impedance microphone.Automatic music mute is provided when making a telephone  
page. Background music mute level during a page is adjustable and the music slowly  
fades back in after the page is completed. An automatic level control system limits  
the output level of the telephone page channel so that differences in the volume of  
the paging party's voice will be less noticeable. Bass and treble controls are provided  
for adjusting the quality of the output signal. An Aphex® Aural Exciter feature is also  
provided. Aphex improves the clarity of the output signal by replacing the higher  
frequency harmonics that are normally lost through the telephone system. This  
amplifier includes a built-in night ringer that can be triggered by either a standard  
telephone (analog) ring signal or an external contact closure. The night ringer mutes  
the background music, but not pages.  
Package Contents  
* Telephone Paging Amplifier unit  
* 4 wall-mounting screws  
* Installation and Use Manual  
Before You Start  
Review the contents of the box. Read through this entire manual to understand how  
this product installs and operates.  
Page 4 of 12  
 
Figure 2: Wall Mounting the Amplifier  
SCREW #8 x 5/8"  
(M4 x 16 mm)  
WITH TEFRON WASHER  
1/8 x 5/16 (3 x 8 MM)  
TYP 4 PCS  
. . . . . . . . . . . . . . . . . . . . . . . . .  
. . . . . . . . . . . . . . . . . . . .  
MUSIC VOLUME  
. . . . . . . . . . . . . . . . . . . . . . . . .  
. . . . . . . . . . . . . . . . . . . .  
RACK  
MOUNTING  
SCREWS ARE  
NOT SUPPLIED  
Figure 3: Rack Mounting the Amplifier  
Installation  
The amplifier is designed for wall mount applications but can also be mounted in a  
standard 19" rack. The TPU250 amplifier weighs 31 lbs.  
Mounting  
NOTE: The amplifier will produce heat during operation which will rise and may  
cause problems for temperature-sensitive equipment mounted above it. Mount the  
amplifier near the top of the backboard (for wall mounting) or rack (for rack  
mounting) so that no other equipment will be above it. If this is not possible, then  
allow at least 12" between the top of the amplifier and the bottom of any equipment  
positioned above it. Also allow at least 6" between the bottom of the amplifier and  
any equipment below it to allow for adequate air circulation.  
W all Mounting  
To wall mount this unit, use the four 5/8” pan head screws with nylon washers  
provided (see Figure 2). Insert the top two screws first leaving the heads protruding  
about 1/4”. Lift the amplifier and place it over the 2 screws using the top keyhole  
slots in the flanges at the sides of the amplifier.Allow the amplifier to rest on the 2  
screws and then proceed to insert the bottom 2 screws into the lower keyhole slots.  
With all the screws in place, tighten the screws to secure the amplifier.  
NOTE: Backboard must be a minimum of 3/8” thick plywood and securely mounted  
to the wall.  
Rack Mounting  
The amplifier was designed to mount directly to standard 19” racks using the  
mounting flanges as shown in Figure 3 (rack screws are not supplied). In the factory  
set position, the unit will protrude from the front of the rack.This provides the best  
ventilation of the unit and easier access to the wiring connections.  
NOTE: The unit can also be mounted partially recessed in the rack by reversing the  
mounting flanges. Unscrew the mounting flanges (3 screws mount the flange to the  
cover) and install them in a flipped over orientation. This position will provide  
adequate ventilation and centers the weight of the unit over the rack rails.  
Page 5 of 12  
 
W iring Connections  
IMPORTANT: Before making any connections or wiring changes to the amplifier  
or any equipment connected to the amplifier, make sure that the amplifier is NOT  
plugged into an AC outlet.  
NOTE: The amplifier does not have a power switch, so it must be unplugged in  
order to turn the power off.  
All signal input and control wiring is made to the terminal strip and RCA connectors  
beneath the left side access cover. Loosen the 2 Phillips-head screws on each side  
of the cover and remove it.  
Input W iring  
TEL Input  
The telephone input is a 600-ohm, dry loop, balanced input available at the T and R  
terminals.Automatic music mute is provided when making a telephone page.  
Telephone Paging Amplifier  
Figure 4: Wiring for TEL Input  
MIC VOLUME  
MODEL TPU250  
TEL VOLUME  
ALC  
250 WATT AMPLIFIER  
BOGEN COMMUNICATIONS  
APHEX  
MUSIC IN  
BRIDGING  
MUSIC  
MUTE  
MIC  
BAL  
+
MUSIC  
IN  
CONTACT  
RING  
TEL  
RING  
TEL  
GND  
GND  
T
R
COMPLIES WITH PART 68, FCC RULES  
FCC REGISTRATION NUMBER:  
CD23CH-17705-KX-N  
BOGEN  
RAMSEY, N.J.  
TAM B  
TELEPHONE ACCESS MODULE  
COMMUNICATIONS  
RINGER EQUIVALENCE: 1.2 B  
BGM  
IN  
MODE  
OFF  
ON  
T
R
24VDC PWR SUPPLY  
48VDC PWR SUPPLY  
CONFIRMATION TONE  
PREANNOUNCE TONE  
VOX DISABLE  
S1,S2  
PHONE SYSTEM  
EXT VOX ENABLE  
S1,S2  
S3  
+M  
S4  
S3  
-M  
PT  
S4  
S5  
PAGING OUTPUT  
VOX ENABLE  
S5  
PR  
N.O.  
CONTACT CLOSURE A  
COM  
+24/48  
POWER SUPPLY  
(TRUNK ACCESS ONLY)  
-24/48  
(0.1A)  
BGM  
VOL  
MODE  
SWITCHES  
MIN  
MAX  
MIN  
MAX  
MIN  
MAX  
TONE VOL.  
VOX DELAY  
PAGING TIME  
Page 6 of 12  
 
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  
sources 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 Bogens MBS1000 microphone. Connect  
the microphone's black wire to the amplifier's "-" (negative) terminal under the MIC  
BAL connections. Connect the microphones 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.  
Figure 5: Connect Microphone to Telephone Paging Amplifier  
MIC VOLUME  
MODEL TPU250  
TEL VOLUME  
ALC  
250 WATT AMPLIFIER  
BOGEN COMMUNICATIONS  
APHEX  
MUSIC IN  
BRIDGING  
Bogen  
MBS1000  
MUSIC  
MUTE  
MIC  
BAL  
+
MUSIC  
IN  
CONTACT  
RING  
TEL  
RING  
TEL  
GND  
GND  
T
R
Shield - GND  
MIC  
MUSIC  
MUTE  
White -  
Green -  
Microphone  
Cable  
Red - MIC + ‘MIC BAL’  
Black - MIC - ‘MIC BAL’  
Page 7 of 12  
 
Night Ringer Connection  
Either a standard telephone (analog) ring signal (90 - 105 V AC, 20 - 30 Hz) or an  
external contact closure activates the night ringer function of the amplifier. To  
activate the night ringer using standard telephone (analog) ring, connect the analog  
station's tip lead to the TEL RING "T" terminal and connect the ring lead to the "R"  
terminal. If using an external contact closure, connect the closure pair across the  
CONTACT RING terminals (not polarized).The night ringer follows the cadence of  
the activating signal.  
Bridging Inputs  
Bridging permits two amplifiers to be used in tandem with one another to increase  
the total output power of the system, thereby permitting additional speakers to be  
added (see Figure 6). For example, when two 250-watt amplifiers are bridged, the  
total output capacity of the system is 500 watts. However, bridging does not increase  
the size of the load a TPU250 can individually handle. Once bridged, each amplifier  
will amplify the inputs present on both amplifiers. The level control of a particular  
input on an amplifier will control the volume of this signal on both amplifiers. The  
cable used to bridge amplifiers should not exceed 20 feet in length.  
NOTE: You cannot bridge more than two TPU250 amplifiers at one time.TPU250  
amplifiers can only be bridged with other TPU250 amplifiers.  
Input Cover Replacem ent  
When all connections are made, remove an appropriate knockout on the input  
cover. Replace the cover and tighten the screws while dressing the wires through  
the knockout hole.  
RINGER VOLUME  
MUSIC MUTE  
MUSIC VOLUME  
POWER  
PEAK LEVEL  
APHEX  
MODEL TPU250  
250 WATT AMPLIFIER  
MIC VOLUME  
TEL VOLUME  
ALC  
TREBLE  
BASS  
BOGEN COMMUNICATIONS  
VOX  
RINGER VOLUME  
MUSIC MUTE  
MUSIC VOLUME  
MIC VOLUME  
TEL VOLUME  
ALC  
APHEX  
MUSIC IN  
BRIDGING  
MODEL TPU250  
250 WATT AMPLIFIER  
BOGEN COMMUNICATIONS  
MUSIC  
MUTE  
MIC  
BAL  
+
MUSIC  
IN  
CONTACT  
RING  
TEL  
RING  
TEL  
GND  
GND  
T
R
APHEX  
MUSIC IN  
BRIDGING  
MUSIC  
MUTE  
MIC  
BAL  
MUSIC  
IN  
CONTACT  
RING  
TEL  
RING  
TEL  
GND  
GND  
+
T
R
70V 25V COM GND  
POWER  
PEAK LEVEL  
APHEX  
TREBLE  
BASS  
RINGER VOLUME  
MUSIC MUTE  
MUSIC VOLUME  
MIC VOLUME  
TEL VOLUME  
ALC  
VOX  
RINGER VOLUME  
MUSIC MUTE  
MUSIC VOLUME  
MIC VOLUME  
TEL VOLUME  
ALC  
MODEL TPU250  
250 WATT AMPLIFIER  
MODEL TPU250  
250 WATT AMPLIFIER  
BOGEN COMMUNICATIONS  
BOGEN COMMUNICATIONS  
APHEX  
MUSIC IN  
BRIDGING  
APHEX  
MUSIC IN  
BRIDGING  
MUSIC  
MUTE  
MIC  
BAL  
MUSIC  
IN  
CONTACT  
RING  
TEL  
RING  
TEL  
GND  
GND  
+
T
R
70V 25V COM GND  
MUSIC  
MUTE  
MIC  
BAL  
MUSIC  
IN  
CONTACT  
RING  
TEL  
RING  
TEL  
GND  
GND  
+
T
R
Figure 6: Bridging Inputs  
Page 8 of 12  
 
O utput W iring  
All output wiring connections are made to the terminal strip located under the right  
side access panel. Loosen the 2 Phillips-head screws on each side of the cover and  
remove the cover.  
IMPORTANT: Before making any connections or wiring changes to the amplifier  
or any equipment connected to the amplifier, make sure that the amplifier is NOT  
plugged into an AC outlet.  
NOTE: The amplifier does not have a power switch, so it must be unplugged in  
order to turn the power off.  
Speaker Connection  
70-volt speaker connections are made between the 70V and COM terminals on the  
output terminal strip (see Figure 7). Use a 22 AWG shielded, twisted pair cable.  
Connect the shield of the cable to the GND terminal of the output terminal strip.  
The COM and GND terminals of the output terminal strip are connected using a  
shorting clip.The shorting clip enables the amplifier output to act as an unbalanced  
output (one side of the output connected to ground). If desired, the output can be  
made to be a balanced output with no connection to ground.To balance the output,  
simply remove the shorting clip.All speaker connections remain the same as above  
including connecting the shield to the GND terminal.  
NOTE: The amplifier output terminal strip includes a terminal for 25V speaker  
connections. This is provided for special applications and is generally not used.  
70V  
COM GND  
25V  
Output Terminal Strip  
+
MIC VOLUME  
MODEL TPU250  
TEL VOLUME  
ALC  
250 WATT AMPLIFIER  
BOGEN COMMUNICATIONS  
APHEX  
MUSIC IN  
BRIDGING  
MUSIC  
MUTE  
MIC  
BAL  
+
MUSIC  
IN  
CONTACT  
RING  
TEL  
RING  
TEL  
GND  
GND  
T
R
70V 25V COM GND  
+
Figure 7: Speaker Connection, Output Wiring  
Page 9 of 12  
 
Additional Power Am plifier  
An external power amplifier can be used with the TPU250 amplifier.You must first  
add a resistor voltage divider to the telephone amplifier, as illustrated in Figure 8.  
Connect a patch cord to the high-level/high-impedance input of the booster  
amplifier.  
TO 25V OUTPUT TERMINAL  
Figure 8 : Output Circuitry  
39K  
1/2 W  
TO HI-Z INPUT OF  
BOOSTER AMPLIFIER  
10K  
1/2W  
TO COM ON  
TERMINAL STRIP  
RCA Jack  
.....  
.....  
.....  
.....  
WMT1A  
Amplifier  
Figure 9 : WMT1A Connection to RCA Jack on Amplifier  
Line-Matching Transform er  
An RCA jack is provided near the output terminal strip for connection to a  
WMT1A line-matching transformer. A 600-ohm, balanced telephone level output  
signal can be obtained by plugging the RCA connector of the WMT1A line-matching  
transformer into this jack and taking the output signal off of the WMT1A line-  
matching transformer screw terminals (see Figure 9).This is useful for dividing a long  
line when connecting to remote equipment.  
W MT1A Connector  
O utput Cover Replacem ent  
When all output connections are made, remove the appropriate knockout on the  
input cover. Replace the cover and tighten the screws while dressing the wires  
through the knockout hole.  
Page 10 of 12  
 
O peration  
IMPORTANT: Before plugging the amplifier into an AC outlet, turn all volume  
controls to their full counterclockwise positions.  
Indicators  
POW ER IND  
The POWER IND LED illuminates whenever AC power is applied to the amplifier  
(there is no power switch on the amplifier).  
PEAK LEVEL  
The PEAK LEVEL LED illuminates whenever the speaker output signal level  
approaches its maximum level. This indicator is used when setting volume levels.  
Maximum output level is achieved when the PEAK LEVEL indicator flashes  
intermittently on loud peaks of the input signal. If the indicator illuminates steadily,  
the output signal volume is set too high and distortion is occurring. Decrease the  
volume control for the appropriate input until the indicator flashes only  
occassionally.  
Controls  
TEL VO LUME  
This control adjusts the level of the telephone page output. Further adjustment can  
be made using the PEAK LEVEL indicator described above.  
MUSIC VO LUME  
This control adjusts the level of the background music output.The background music  
level should be set to an acceptable level without overdriving the system. When  
adjusting this level, the PEAK LEVEL indicator should be observed to ensure that the  
amplifier signal is not distorted.  
MUSIC MUTE  
This control adjusts the level of the background music heard during a paging  
announcement. The background music mute level should be set to the customer's  
satisfaction, but the page announcement must always be easily heard above the  
background music.  
MIC VO LUME  
This control adjusts the level of the microphone page output.  
CAUTIO N: Microphone should not be placed near any paging loudspeakers.  
RINGER VO LUME  
This control adjusts the level of the night ringer tone output.The background music  
level should be set to the customer's satisfaction. When adjusting this level, the  
PEAK LEVEL indicator should be used to ensure that the amplifier signal is not  
distorted.  
APHEX  
This control adjusts the amount of Aphex® Aural Exciter effect mixed in to the page  
signal.To use this function, the APHEX switch beneath the input connection cover  
must be set to ON. Setting this switch to OFF bypasses the Aphex effect and makes  
the control inoperable.With the APHEX switch turned on, make a page and rotate  
the control until the audio sounds crisp and clear.  
Page 11 of 12  
 
BASS and TREBLE  
Bass and treble controls are provided to adjust the high frequency and low frequency  
response of the paging system. Reference positions are provided for these controls.  
When set to these positions, the frequency response of the system will be flat. Set  
the controls to the customers satisfaction. Clockwise rotation increases (boosts)  
the response and counterclockwise reduces (cuts) the response. Increasing bass  
and/or treble can cause output signal peaks to increase. Check the PEAK LEVEL  
indicator after making bass adjustment and lower the music input volume if excess  
peaking occurs.  
VOX (Voice O perated) SENS  
The VOX SENSitivity control should be set so that only the desired signal is above  
the threshold level, while noise or unwanted signal is below it.When an input signal  
(such as voice) is detected, the music channel will be muted.To adjust the sensitivity  
of this circuit:  
1) Rotate the control fully clockwise.While making a page announcement and talking  
at a low level, the sound should not be choppy nor missing parts of words. If it is  
choppy, or if intelligibility is poor, rotate the control counterclockwise to the point  
where the sound is clear and crisp (but not to the maximum counterclockwise  
position).  
2) If the background music shuts down when no page is in progress, rotate the  
control clockwise until the music is restored.  
ALC  
The ALC controls the level at which the amplifier will begin to limit the output signal  
level.  
Manual O utput Adjustm ent Procedure (follow only if minor adjustments to the  
reference settings are not adequate)  
1) Disable ALC by turning ALC control to the maximum counterclockwise position.  
2) Make a page, speaking softly, yet distinctly. Set the TEL VOLUME control to the  
desired paging level during this page.  
3) Make another page speaking relatively loudly this time. Rotate the ALC control  
clockwise, while making the page, until it has the same loudness as the first page.  
NOTE: The TEL Volume and ALC controls work together to set the output level.  
NOTE: The PEAK LEVEL indicator should not show excessive peaking during loud  
pages. If this is occurring, the ALC control must be further increased.  
Page 12 of 12  
 

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