Installation
Rack Mounted Installation
The amplifier may be mounted in a standard 19” equipment rack,
by using the Bogen Model RPK53 Rack Panel Kit (accessory; sold
separately), which includes two brackets and the necessary
hardware for installation.
NOTE:
Before installing the amplifier in a rack, install any accessory
transformers required. See Input Connections section.
Attach one of the RPK53 brackets to each side of the unit and se-
cure (with screws provided) through the holes on the side panel.
Each bracket measures 2” W x 3-1/2” H x 1” D.
Ventilation
The amplifier generates heat during operation. It must be prop-
erly ventilated to prevent excessive temperature rise. If other heat-
producing equipment, or several amplifiers have been installed in
an enclosed rack or cabinet, you must ensure that there is space
above and below the amplifier(s) to allow for passive cooling. It is
recommended that the amplifier be installed on the bottom of a
rack or above any equipment that does not produce heat.
Power and Grounding
The three-wire AC line cord has a three-prong plug which should
be plugged into a properly grounded, three-wire, 120V ~ 60Hz
outlet. It is important to ground the amplifier.
Auxiliary Power Receptacle
Caution:
The front panel POWER switch does not control the aux-
iliary receptacle.
The AUX POWER receptacle on the rear panel is a three-wire
grounded outlet that may be used to supply power to accessory
equipment in the sound system. Ensure that the accessory equip-
ment does not require more than 300 watts. Equipment connected
to the auxiliary receptacle will be grounded, provided the amplifier
line cord has been properly grounded. The outlet is protected by
an internal fuse.
Input Connections
High-Impedance Input
A high-impedance input is provided by standard RCA jacks
(
see
Fig. 1). An input signal of 300mV is required for full rated output.
Low-Impedance Balanced Input
Caution:
To avoid electric shock, be sure to disconnect AC
Power Cord before removing the cover of the amplifier unit.
Warning:
DO NOT perform any function requiring the removal
of the cover of the amplifier unless you are qualified to do so.
A balanced input, provided at the BAL LO-Z terminal strip (Fig. 1),
requires the installation of a Bogen Model TL600 line-matching
transformer. Remove the top cover of the unit and install the trans-
former in the socket designated XT1 (see Fig. 2 on back page) on
the printed circuit board. If an unbalanced input is required, connect
a jumper from the GND terminal to an adjacent input terminal.
Bridging Input
Caution:
To avoid electric shock, be sure to disconnect AC
Power Cord before removing the cover of the amplifier unit.
Warning:
DO NOT perform any function requiring the removal
of the cover of the amplifier unless you are qualified to do so.
The inputs of two or more amplifiers may be paralleled by installing
accessory transformer TL100 (for up to 6 amplifiers) in the trans-
former socket designated XT1 (see Fig. 2) on the printed circuit
board. Connect the signal source to the BAL LO-Z terminal strip
and connect the cable shield to the GND terminal. For an unbal-
anced input, connect a jumper wire from the GND terminal to an
adjacent input terminal.
Input from Another Amplifier
The BPA60 may be driven from an amplifier that provides a 25V
or 70V constant voltage output. Connect the output of the driver
amplifier to one of the HI-Z input jacks via a resistor network (see
Fig. 3). These resistors are in addition to the normal loudspeaker
load impedance on the output of the driver amplifier.
Output Connections
Caution:
Follow local electrical codes when connecting ampli-
fier output.
Figure 1
shows the location and impedance values for the output
terminal strip. Class 2 wiring is acceptable for output loads.
Speakers
The BPA60 features output connectors for 16-ohm, 8-ohm/25V,
25VCT and 70V speakers. The amplifier provides outputs for
25V and 70V speakers. 70-volt speaker connections are made
between the 70V and COM terminals on 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 bal-
ance the output, simply remove the shorting clip. All speaker con-
nections remain the same as above. 25V speaker connections
are done in the same manner.
Hum
If the connections between the signal sources and amplifier are in-
correct or defective, hum-type interference may occur. Check for
proper grounding, broken wires or shields, poor connector contacts,
etc. Keep input cables away from speaker cables and speaker
cables away from AC power lines. Where auxiliary equipment is
used, it may be necessary to connect a separate ground wire from
the chassis of such equipment to a suitable earth ground.
Fig. 1 - BPA60 Rear Panel Connection Diagram
