M ight be mentioned elsewhere below, but from the BL90 Manual.....
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.
