Bose FreeSpace E4 Series II, Service Manual

Page: 89 / 109

89
TROUBLESHOOTING
Bad sound in a zone Auto Volume does not calibrate
Auto Volume calibration may fail if the
process cannot obtain an adequate source
level. This may be due to:
• Loudspeakers are tapped too high
• Maximum output gain is less than -20 dB
• Source is not operating
• Source level is too low
Calibration could also fail if the calculated
loop gain is not within required limits. This
may be due to:
• Broken microphone cable
• Loudspeakers are not connected
• Sensing microphone is not connected, or is
connected to the wrong zone
Bad sound
Is the sound
unnatural?
Verify that the correct Speaker EQ
is selected in the Installer™ soft-
ware for that zone.
Verify that the speakers are wired in
phase. Check the rear panel mark-
ings.
No
Yes
Reduce the input gain using
Installer™ software until the
indicator is solid green.
Verify that the input source signal
is clean. If source is from a mixer,
decrease the mixer gain.
Is the AMP OUTPUT
indicator flashing?
Are input and
output indicators green
and sound is
distorted?
Verify source
hardware settings
Yes
No
No
Yes
Verify that the loudspeakers are
not being overdriven or are dam-
aged.
Verify that the total load imped-
ance presented to the E4 output
is within specified limits for the
selected mode of operation.
Is the input signal
clean at the E4 input?
No
Yes