4
3.0 Introducing
The Controllers
Bose
®
40
TM
C and 80
®
C II systems controllers
(Figure ) provide the equalization and crossover
electronics necessary to complete any sound
reinforcement system which includes the Bose 40,
40W, 80, or 80W loudspeakers. Each controller
has a Mode Switch to accommodate various full-
range or bi-amplified sound system configurations.
The U 9” rack-mount chassis of each controller
contains dual-channel signal processing electronics
with 8 dB/octave crossover and active equalization
circuitry.
These work with the 40 and 80
loudspeakers as well as in bi-amplified systems with
the Panaray
TM
50
TM
B Acoustimass
®
bass enclosure
or the 50BP portable Acoustimass bass enclosure.
Both controllers have -0/+4 dB input sensitivity
switches, and balanced XLR inputs and outputs.
They also have -8/+3 dB bass level control, plus
bass Mono Sum and Mode switches.
Authorized Bose personnel can install the separate
OC- option card in the 40C, 80C II, or 50C
(Panaray) systems controllers. The OC- option
card allows a system to be configured with the
Acoustic Wave
®
Cannon
TM
System II loudspeaker as
the bass rather than the 50B or 50BP enclosures.
4.0 sound system
Configurations
4.1 Basic Configurations
The 40
TM
C and 80
®
C II systems controllers
offer a flexible building-block approach to sound
system design. Please review the sample system
configurations shown in Figures through 8. They
can help you get started with your system design.
Note:
For bi-amplified systems using a 502
TM
B,
502BP, or Acoustic Wave
®
Cannon
TM
System II
loudspeaker for bass reinforcement, you will need a
channel of amplification in addition to that supplying
power to the 402 or 802 loudspeakers. This can
be: (A) a single mono amplifier, (B) one side of
a dual-channel amplifier, or (C) a dual-channel
amplifier in bridged mono mode (if the amplifier has
this). Always consult the amplifier manufacturer’s
specifications to ensure that the output power
matches that of the recommended range for the
loudspeakers in the system — see Appendix B.
Figure 1
The 40C systems controller (left) and the 80C II systems controller.
