Owner's Manual for the vehicle. With a quick reference ... - E38.org

BMW Active Seat* Safety belt tensioner DSP sound system*
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This causes a movement of the spinal
column which is barely detectable, together
with an improvement in the flow
of blood to the intervertebral disks and
the muscle structure in the area of the
spinal column.
The passengers do not suffer as much
from muscle tension, back pain in the
lumbar region or symptoms of fatigue.
As a result, the Active Seat represents a
significant contribution to driving comfort
and driving safety.
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The safety belt tensioner responds to
collisions by tightening the belts to ensure
that occupants remain firmly positioned
in their seats. A gas-pressure
system retracts the buckle assembly to
tension the shoulder and lap belts
within fractions of a second. This reduces
the tendency to slide under the
lap belt.
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The DSP Professional premium sound
system features a special amplifier
combined with Digital Sound Processing
(DSP) and integrated speakers to
surround you with crisp, true-to-life
sound reproduction.
The speaker system's subwoofers,
woofers, midrange speakers and tweeters
furnish you with an impressively fullbodied
listening experience. The individual
components are oriented so as
to produce the aural sensation that you
would experience facing the stage in a
concert hall. The system also automatically
adjusts the bass and treble settings
to compensate for changes in volume
and vehicle speed.
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