Troubleshooting; Some Features In The Beolab 90 Controls Are Disabled; Lip Sync Problems; Echo Problems - Bang & Olufsen BeoLab 90 Technical Sound Manual

Troubleshooting

13.1 Some features in the
BeoLab 90 controls are
disabled
When connected to many Bang &
Olufsen sources via Power Link or
Wireless Power Link, some features in
the BeoLab 90 may be disabled. This is
to avoid errors such as mis-calibration
of the volume setting with other
loudspeakers in a surround
configuration or duplication of
processing (e.g. turning up the Bass
controller twice: once in the source
and once in the loudspeaker).

13.2 Lip Sync problems

When used with an older Bang &
Olufsen television (BeoSystem 3-based
or earlier) or a third-party television,
the Latency Mode of the BeoLab 90 is
not automatically controlled by the
source. Consequently, the Latency
Mode should be set to "Low" to ensure
synchronisation with the video signal.
This can be done manually using the
control interface (see section 5.10.1),
or set as the default for the preset
triggered by the audio input connected
to the television.

13.3 Echo problems

13.3.1 Multiroom audio
systems
When a BeoLab 90 is used with a
third-party multiroom system, the
loudspeaker's Latency Mode should be
set to "Low" in order to reduce the
delay time of the BeoLab 90 to a
minimum. If the Latency Mode is set to
"High" and if it is impossible to adjust
the expected loudspeaker latency in
the multiroom system, then the
BeoLab 90's latency will be high
enough that they appear to produce an
audible echo relative to other
loudspeakers in the system.

13.3.2 Surround Processors

When a BeoLab 90 is used with an
older Bang & Olufsen surround
processor (such as the BeoSystem 3 or
earlier devices) or a third-party
surround processor, the loudspeaker's
Latency Mode should be set to "Low" in
order to reduce the delay time of the
BeoLab 90 to a minimum. If the
Latency Mode is set to "High" and if it
is impossible to adjust the expected
loudspeaker latency in the surround
processor, then the BeoLab 90's
latency will be high enough that they
appear to produce an audible echo
relative to other loudspeakers in the
system.
It may be possible to "trick" some
surround processors into compensating
for BeoLab 90's latency in High
Latency Mode by adding 34.3 m (112.5
feet) to their actual distance from the
listening position. This value
corresponds to a 100 ms latency.
When used in Low Latency Mode, 8.6
m (28.1 feet) should be added to the
actual distance from the listening
position. This value corresponds to an
25 ms latency.
13.4 Loudspeakers don't turn
on automatically
If the BeoLab 90's are set to recognise
the Wireless Power Link / WiSA input,
then all cabled inputs are disabled.
If a cabled source is not in the list of
signals set for auto-detection as
described in Auto-detection, then it will
not automatically turn on the
loudspeakers.
It is possible that the Detection
Threshold, described in Detection
Threshold, is set to too high a value to
detect the signal.
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13.5 Loudspeakers never
shut o

13.5.1 Analogue sources

Adjust the Detection Threshold higher
as described in Detection Threshold
a higher value to prevent it from
detecting noise on the input cable.

13.5.2 Digital sources

S/PDIF and Optical

Ensure that the signal on the digital
connection either shuts down, or
transmits a "digital black" signal. The
BeoLab 90 detects any non-zero signal
on these digital inputs and will turn on
automatically as a result.
13.6 The application or web
interface do not work
Ensure that the Digital Power Link
cable between the Master and Slave
loudspeakers is connected.
Ensure that the loudspeakers and the
device are connected to the same
network.
13.7 Loudspeakers are
distorting at low levels
The Maximum Input Level as described
in Maximum Input Voltage
to too low a value to be compatible
with the audio source. This can cause
the input of the BeoLab 90 to clip.
13.8 Loudspeakers are noisy /
too quiet
If the source has a variable output
level, then the best strategy for gain
management is to increase the
source's output level to maximum and
use the volume control of the BeoLab
90's. This will ensure the lowest
possible noise floor of the overall
system.
to
may be set