FSR IT-AS411 Series User Manual
Page 8
8
REAR PANEL
Mute Switch Input:
Provide a dry contact or low leakage open collector closure to
mute the amplifi er. No connection, or an open circuit provides
normal operation. The IT-AS411 switcher / amplifi er provides
pop-free transitions in and out of mute mode.
Audio Input:
NOTE: See Option DIP Switch table for proper settings and additional
information.
Connect a balanced or unbalanced audio source to this point.
Unbalanced signals should be connected between “Hi” and “Lo.”
• For IT-AS411-25M70 only:
Connect mono sources to the RIGHT or LEFT audio input
terminals
• For IT-AS411-25S8 only:
Connect mono sources to the RIGHT or LEFT audio input
terminals.
Audio Out:
•
For IT-AS411-25M70 only:
Provides a choice of either 4-8 ohm or 70V mono output for
fl exibility in interfacing to the room speakers. Connections
should be made to only one output type in a particular
installation.
• For IT-AS411-25S8 only:
Provides connection to 4-8 ohm stereo speakers. Outputs may
be bridged (connect + to + and connect - to - . When bridging,
be sure to set front panel switch 2 to “mono” mode to double the
output power. Use 4 ohm speaker, or parallel combination of 8
ohm speaker to achieve full power when bridging outputs.
Power Input:
Connect to supplied 24V external power supply
9
OPTION DIP SWITCHES AND INTERNAL
JUMPER
SWITCH 1
“VOICE IN” TYPE
Up= LINE
Down= MIC
SWITCH 2
MIC SENSITIVITY
Up= -45dB
Down= -60dB
SWITCH 3
PHANTOM POWER
Up= OFF
Down= ON
SWITCH 4
MONO / STEREO
Up= Stereo
Down= Mono
When in Mono mode, the Left and Right
audio inputs are actively summed together
and fed to both the Left and Right output
channels.
When in stereo mode, Left and Right
inputs are independent.
NOTE: The IT-AS411-M70 mono version
of the product requires this switch to be set
to mono mode when using stereo sources.
When operating the IT-AS411-S8 in
bridged output mode, this switch should
also be set to mono mode.
JP2
(INTERNAL JUMPER)
USER MIC
SENSITIVITY
ADJUSTMENT
Open jumper: 0dB. mic sensitivity
(default)
Closed jumper: -6dB mic attenuation