Bogen CT100B Schematic
A DIVISION OF LEAR SIEGLER, INC.
UBLIC
The
Bogen
mixer-equalizer-amplifiers, designed for professional-quality
sound systems that once required custom audio equipment. The
CT60B,
rated at 60 watts, and the
output, are comprised of integrated circuits, silicon transistors and
diodes with the latest state-of-the-art active 2/ 3 octave equalization
circuitry.
Four low-impedance, transformer isolated, balanced microphone inputs, (expandable to six with an accessory PMM-2B)
each with individual volume controls, are convertible to highimpedance inputs by rearranging jumpers on the printed circuit
board. A phantom supply for the use of condenser microphones is
built into these units. Professional three-pin female, XLR-type
microphone connectors are provided on the rear panel.
Two auxiliary channels, with an
can be used for inputs from a tuner, tape/cassette player,
phonograph with a ceramic cartridge, or an optional
Multiple Tone Generator.
Built-in microphone precedence, remote volume control,
500/600-ohm line input and output, with accessories, tape and
tape/ booster outputs, amplifier bridging, and connecting amplifiers’ outputs in series are among the many capabilities of these
units.
Ten slide controls, with detented flat positions, allow the
selected frequency equalizer filter circuit to meet individual
installation requirements. Feedback is virtually eliminated, while
intelligibility is greatly improved, and usable power is increased.
A recessed screwdriver-adjustable front panel control for an
electronic compressor circuit is also provided. This circuit
compensates for poor microphone technique or a variety of
announcers, and it eliminates “blasting” in background music
applications.
Screw terminals on the rear panel allow connections to standard
speaker impedance taps, as well as connections for
70-volt balanced lines.
The amplifier operates from a
three-prong line cord provides automatic grounding when
connected to a three-wire grounded power outlet. The power line is
protected by a circuit breaker, and the output transistors by a
thermal overload device, which shuts off the unit when the
temperature of the heat sink rises excessively.
ADDRESS
Models
CT60B
and
CT1OOB
105-125
are versatile
CT100B,
AUXl/
rated at 100 watts
AUX2 fader control
volt, 60 Hz source. A
preamp-
25-volt
TG-4B
and
INSTALLATION
UNPACKING
The amplifier was carefully checked before leaving the factory.
Inspect shipping container and unit carefully for indications of
improper handling. If the unit has been damaged, make an
immediate claim to the distributor from whom it was purchased. If
the amplifier was shipped to you, notify the carrier without delay
and place your claim.
MODELS
CT60B
and CTIOOB
POWER AND GROUNDING
The ac line cord has a three-prong plug which should be plugged
into a three-wire grounded, 120 volt, 60 Hz outlet. As it is
important to ground the amplifier, where a three-wire outlet is not
available, use an adapter (e.g., Leviton No. 5017) and connect the
grounding pigtail to the screw securing the wall plate. If the wall
plate screw is not grounded, connect a wire from the GND
terminal of the amplifier to a suitable ground.
AUXILIARY POWER
CAUTION
Use the ON/OFF switch on a phonograph or
other accessory unit connected to the auxiliary
receptacle, as the power switch on the amplifer
does not control this receptacle.
The auxiliary power receptacle on the rear chassis is a three-wire
grounded outlet which can supply power to accessory equipment
in the sound system. Be sure that the accessory component does
not require more than 300 watts. The power switch does not
control this receptacle.
Associated equipment connected to the auxiliary receptacle
with a three-prong line cord will be grounded, providing the
amplifier line cord has been properly grounded.
INPUT CONNECTIONS
LOW-IMPEDANCE BALANCED MICROPHONES:
amplifier is designed for direct connection of low-impedance
balanced microphones to the MIC input receptacles of the
amplifier. The microphone lead should be a two-conductor
shielded cable terminated in a Cannon XLR312-C or
CON-2 connector, as shown in Figure 1.
CONDENSER MICROPHONES:
as for low-impedance balanced microphones.
HIGH-IMPEDANCE MICROPHONES: The
should be a singleconductor shielded cable under 35 feet in length
and terminated in a Cannon XLR312-C or
connector, as shown in Figure 1. For information regarding the
use of high-impedance microphones, see notes on the schematic
diagram.
MICROPHONE PRECEDENCE: A built-in circuit provides
microphone precedence for special announcements. A customersupplied SPST switch with normally-open contacts is required for
this function. When the contacts are closed, the auxiliary and other
microphone inputs are muted. (See
diagram and related notes.)
Connect in the same manner
microphone lead
Bogen
TSlOl
in the schematic
The
Bogen
CON-2
Printed in USA 8305
54-5751-01
Power Output:
RMS
@
1000 Hz
Frequency Response:
Regulation
Line Fusing
full
Sensitivity (for
&
Noise
Hum
(below rated output)
Inputs (impedance)
Outputs (impedance)
Input/Output
Connectors
Controls
Equalizer Filters
Compression
Semi-conductors
Power Source/
Consumption
Dimensions
Shipping Weight
output)
TECHNICAL SPECIFICATIONS
CT100B
100
w @ less than 2%
total harmonic distortion
±2
50 Hz to 15 kHz
2dB
Resettable Circuit Breaker 2.5A
LO-Z balanced MIC, 0.3
LO-Z balanced MIC -55
4 LO-Z balanced dynamic or condenser MIC inputs, each convertible to HI-Z MICs; 2 HI-Z
with optional WMT-1 accessory; remote volume control for all MIC
4,6-8, 16 ohm speaker taps,
25 VCT and 70V balanced 25 VCT and 70V balanced
or unbalanced lines. or unbalanced lines.
Tape and Tape/ Booster, 500/600-ohm line output with WMT-1 optional accessory.
MIC, professional 3-pin audio connectors (female) Cannon XLR313 or Switchcraft C3F
Series; HI-Z standard phono jacks for Tape, Tape/ Booster, Bridging, and optional accessory
WMT-1 output; provision for optional WMT-I input; screw terminals for speaker connections.
10 filters centered at preferred
21 silicon transistors, 10
120
V, 50/60
23 lbs., 12 oz. (10.8 kg.)
AUX inputs with fader control;
4 MIC Volume, AUX
10 Equalizer Filter Slide Controls, Compressor Control, Power Switch
1250,2000,3150, and 5000 Hz. Boost/Cut:
5 ms. attack time, 2 s. decay time, max. compression 30 dB
IC’s,
10 diodes 19 silicon transistors, 10
Hz, 2.5A, 300W 120 V,
16 3/8”
W x
13¾”
mV;
HI-Z MIC, 3
dB;
HI-Z MIC -60
l/
AUX 2 - fader, MASTER VOLUME,
IS0
center frequencies of 80, 125, 200, 315,
D x
4¾”
H (41.5 x 34.9 x 12 cm)
dB
500/ 6OO-ohm
total harmonic distortion
Resettable Circuit Breaker
mV;
dB;
8,16
CT6OB
60 w
@
less than 2%
AUX.
0.15V
AUX -70
line input
±12
dB
&
AUX. inputs.
ohm speaker taps,
dB
50/60
Hz,
22 lbs. (10 kg.)
500,
IC’s,
1.6A,
1.6A
800,
10 diodes
170W
1/AUX
AUX
are provided for high-level, high impedance inputs. These may be
used to connect a tuner, tape/cassette player, record player
utilizing a ceramic cartridge, or the input from an accessory
WMT-1 line-matching transformer. (Refer to Accessories Section.)
An input signal of 0.15 volts is required to obtain full output from
the amplifier.
B
.74-2883-01
CF-qTJ
HIGH IMPEDANCE MICROPHONE
LOW IMPEDANCE OR CONDENSER
2 INPUTS: Two auxiliary inputs with a fader control
MICROPHONE
Figure 1
1
u
-
Microphone Cable Connections
I
x,,,?,,
XLR-3-12C
BOGEN
Use singleconductor shielded cable terminated in an RCA
phono plug for connecting an auxiliary component. If hum is
experienced after making connections, run a ground
the chassis of the auxiliary unit and the GND terminal of the
amplifier.
BRIDGING: Two CT-B amplifiers can be bridged together to
double the number of inputs and outputs. Connect a singleconductor shielded cable, terminated in an RCA phono plug at
each end, between the rear panel BRIDGING receptacles of the
two amplifiers. This cable should not exceed 20’in length. If more
than two amplifiers are to be bridged use a
BRIDGING GND ONLY terminals on the rear panel terminal
strip
(TS101)
must also be connected to each other. Any input to
either amplifier will then be fed through and available at the output
of both amplifiers. The amplifiers must each feed separate speaker
systems.
When two amplifiers are bridged together, any
adjustment of the MASTER, COMPRESSION
or Acoustic Equalizer controls in one amplifier
will not affect the output of the other amplifier.
2
wire
“Y”
adapter. The
between
Figure 2 -Rear Panel,
CT100B
OUTPUT CONNECTIONS
SPEAKERS: Output connections are available on the rear panel
terminal strip for 4 (CT-lOOB), 8,16-ohm speakers, 25 volt centertapped and 70 volt lines. Connections necessary are listed in Table
I. Class 2 wiring may be used.
For detailed information see Installation Manual No. 54-5001
furnished with the amplifiers.
TAPE OUTPUT: A tape recorder may also be driven from the
TAPE OUTPUT jack on the amplifier. In this case, the output is
not subject to the master volume and equalization settings of the
amplifier and is controlled at the tape recorder. A patch cord
terminated in an RCA phono plug is connected between the TAPE
OUTPUT jack
BOOSTER OUTPUT: The amplifier may be used to drive a
booster amplifier. Connect a patch cord with an RCA phono plug
from the BOOSTER jack on the rear pane1 of the amplifier to the
high impedence input of the booster amplifier. The output at this
jack is controlled by the amplifier’s volume and equalization
controls.
WMT-1 OUTPUT: This receptacle is used to accommodate a
Bogen
accessory which provides connections to a 500/600-ohm
telephone line. (Refer to Accessories Section).
on the amplifier and the input of the tape recorder.
CONNECTING AMPLIFIERS IN SERIES
Pairs of the same amplifier models can be connected in series to
effectively double the power output into the same loadline, as well
as increase the input capacity. See Figure 3 for connection
diagram. Be certain to remove the link between COM and GND of
amplifier No. 2.
Tone and master volume controls of both amplifiers should be
at the same setting to assure that each amplifier will share the load
equally.
Connect a single conductor shielded cable, terminated in an
RCA phono plug at each end, between the rear panel BRIDGING
receptacles and BRIDGING GND terminal of both amplifiers.
This assures that any input will have equal amplification.
AMPLIFIER I
GND COM
AMPLIFIER
GND COM
A74-2031-01
25VCT
’
I
I
CT60B OR
1
161l
1 I
CT60B
Figure 3- Connecting Like Amplifiers in Series
AMPLIFIER 2
GND COM
CT100B
AMPLIFIER 2
GND COM
OR
CT100B
25VCT
I
“r
\I
L3”
16fl
L_t
7ov
TABLE 1
Models
CTlOOB
Both models
Both models
Both models
Both models
*Also see text under “Output Connections”
Speaker Line
4fI Unbalanced
4fl
Balanced
8fI Unbalanced
80
Balanced
16fI
Unbalanced
16fI
Balanced
25V Unbalanced
25V Balanced
25V Balanced, CT gnd.
70V Unbalanced
70V Balanced
-
OUTPUT CONNECTIONS
Terminal Connections*
4n
and COM 1
4fl
and COM
8fl
and COM 1
8G and COM 1
16fI
and COM 1
16fIaand
COM
25V and COM 1
25V and COM
25V and COM 1
1
1
1
Close link between COM 1 and GND
Open link between COM
Close link between COM
Open link between COM 1 and GND
Close link between COM 1 and GND
Open link between COM 1 and GND
Close link between COM
Open link between COM 1 and GND
Connect jumper between 25V CT and GND
Open link between COM 1 and GND
70V and COM 2
70V and COM 2
Add jumper between COM 2 and GND
No jumper required
Other Connections
1
and GND
1
and GND
1
and GND
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