5 – Rear panel connections
14
TASCAM AV-452
Installation & Support Guide
“Master” audio connections
These connections relate to the audio functions of the
AV-452 which play a “master” role in the setup and
operation of the unit.
W
CASCADE INPUT connectors
These
balanced XLR connectors accept balanced signals
from another AV-452 (or similar unit). These input
signals are selected using the front panel
CASCADE
key
F
and are pre-
ROOM VOLUME
.
Depending on the position of the rear panel DIP
switch ("CASCADE (switch 2)" on page 17), the
cascade input signal can sum with the AV-452 audio,
or can replace it.
X
LINE OUTPUT connectors
These bal-
anced XLR connectors output the post-
ROOM
VOLUME
mix (to another AV-452 unit or power
amplifier).
Y
MEETING OUT connectors
These un-
balanced RCA jacks outputs the pre-
ROOM
VOLUME
mix.
One use for this facility is to connect a recorder to
log the proceedings of meetings, etc.
Z
SPEAKER OUTPUT A and B
connectors
Connect speakers to these binding
post terminals. Take care to observe polarity to avoid
out-of-phase problems.
The speakers attached to these terminals can be
switched individually using the selector keys on the
front panel
I
.
The impedance of the speaker system connected to
each channel should be between 4
Ω
and 16
Ω
.
WARNING
Use of speakers with impedances outside these limits
may result in damage to the speakers and/or the AV-
452.
Also note that the AV-452 should not be operated in
bridged mono mode.
Depending on the DIP switch setting ("SPEAKER
OUT (switch 3)" on page 17), and the
LINE OUTPUT
mode switch
e
, the AV-452 may be configured as a
dual mono amplifier, or as a stereo amplifier.
In the latter case, channel A corresponds to the left
channel, and channel B to the right channel.
a
EMG IN and GND connectors
Use these
barrier strip connectors to attach a 5 Vrms emergency
signal cable.
When this signal is activated, the AV-452 will cut the
signals from the
LINE OUTPUT
X
and
SPEAKER
Z
terminals and all front panel indicators flash.
b
INTERCOM connectors (CV IN)
Use
these connectors to attach the cables from a constant
voltage (CV) intercom system.
Before connecting the AV-452 to such an intercom
system, confirm the voltage used by the intercom
system. The AV-452 can work with intercoms using
12, 24 or 70 volts. When the speaker signal arrives at
the AV-452, it is converted by the AV-452 into a line
level signal, where it is added to the line and speaker
outputs (but not to the
MEETING OUT
or
PHONES
).
3 4 5 6
1 2
ON
DIP
0
1
2
3
4
5
6
7
8
9
W
X
Y
Z
a
b
c
d e
