Bose FreeSpace 6 Podręcznik instalatora - Strona 32
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Troubleshooting
Symptom
The loudspeakers go silent
after a half hour or so of
operation
Feed back during paging
from a microphone
The Opti-voice compressor
LED (block 2) flashes red
sometimes
Quiet passages of music
hard to hear
The Music Compressor LED
flashes red sometimes
There is not enough bass
or "something funny"
about the sound in one
listening region
32
Possible Cause
The amplifiers are shutting
down from thermal overload
There is too much gain for
the paging signal
Page mic is too near one
of the loudspeakers
The gain in block 1 has
been set too high
The Music Compressor has
not been enabled
The Music A or B Source
Trim has been set too low
The gain in block 6 has
been set too high
One or more loudspeakers are
out of phase
The installation is a dual mono
one, where paging is enabled
in one zone but not in the other.
At least one loudspeaker in each
zone is covering the same
listening area and there is bass
cancellation and/or comb
filtering effects
Loudspeakers are placed within
3
1
/
feet (1 m) of a wall or walls,
2
causing bass cancellation
The Bass Control (block 12)
has been turned down
AM180090_02_V.pdf • May 7, 2002
Remedy
Check that the installation permits adequate air flow around the
system electronics and correct if it does not.
Reduce the gain with the Page Source Gain Trim or the Page
Source Gain Switch (block 1).
®
If using the Opti-voice
compressor, try disabling it (block 2).
Relocate the loudspeaker nearest to the page mic or relocate
the page mic. Change the page microphone to a type with a
more directional (cardioid) pickup pattern and orient it away
from the direction of the nearest loudspeaker.
Reduce the gain in block 1 until the LED no longer flashes red
even with the loudest paging signal.
Enable the Music Compressor (block 7).
Turn the appropriate Music Source Trim control (block 6) to the
right until the Music Compressor LED glows green. Back off the
adjustment if the LED turns red.
Reduce the gain in block 6 until the LED no longer flashes red
even with the loudest musical source.
Check that all loudspeakers are in phase.
The phase of the loudspeaker output is inverted when paging is
enabled (180º phase reversal). Relocate one or both loud-
speakers to avoid an overlap zone.
See Section 3.2.1 of the Bose
System Installer's Guide.
Turn the Bass Control up.
®
®
FreeSpace
6 Business Music