Extron Electronics System 5 IP Series User Guide - Manual (Page 17)

2-7 System 5 IP Switchers • Installation: Labeling, Mounting, Cabling
PRELIMINAR
Y
This connector outputs either stereo (left and right) or dual mono channels.
The two mono output audio channels are identical.
If you intend to connect just one speaker, you should set the amplifier to
output a mono signal.
The amplifier’s power supply is separate from the switcher’s main power
supply. If the amplifier shuts off (if the volume gain is set too high, for
example), connected SCPs and control modules will also shut off, but the rest
of the switcher will continue to function normally, allowing you to lower the
gain or volume so the amplifier’s power will be restored.
If only one speaker will be used, connect it to one of the output channels
and configure the output for mono.
Power amp limits (for models with an integrated amplifier)
Via SIS commands or the switcher’s embedded Web pages, the power amp
sensitivity can be adjusted to limit how much actual power is delivered to
the speakers. This feature is useful in environments such as classrooms
where you want to control how loud the room’s audio gets in order to avoid
disturbing adjacent rooms.
When the power amp output is configured for
• no limit (SIS command 0*56#), output is about 20 watts
• -10 dB attenuation (10*56#), output is about 2 watts
Normally two 4 or 8 ohm speakers should be connected to the switcher, and
the switcher should be set for stereo output in order to get 20 watts out per
channel. If you wire either the left or right side (not both) and set the
switcher for stereo output, the result is more than 20 watts output because
the connected channel will draw power from the other channel. This might
damage the speaker, and the signal will be distorted before maximum
volume is reached. For mono output the power amplifier is capable of
reaching 40 watts. If you intend to connect just one speaker, you should set
the amplifier to output mono audio.
If input gain or volume is too high, the amplifier’s power limiting circuit
will limit the power so that the amplifier does not output more than
20 watts. Continuing to increase the gain or volume will eventually cause
the amplifier’s power supply to shut off, which will also cause the SCP and
control modules to power off because they receive their power from the
amp’s power supply. If you lower the volume and input gain, the switcher
will resume functioning.
To reinitialize the switcher, perform an audio or system reset after setting the
power amplifier limit. The switcher must experience a volume change for
the amplifier’s power limit to be functional.
3 Reset button and LED — Pressing this recessed button causes various IP
functions and Ethernet connection settings to
be reset to the factory defaults. See “Resetting
the unit” for details.
R Reset
Button
(Recessed)
Reset
LED