miniDSP Ltd, Hong Kong /
www.minidsp.com
/ Features and specifications subject to change without prior notice
46
8.5
S
IGNAL PROCESSING TABS
In enhanced/bass management mode, the row of five selection tabs is fully enabled:
Each tab selects the information/control display for the key blocks shown in the signal flow diagram on the
previous page. Each is described in detail in following sections, except for the
Dirac
tab which is described on
page 18.
Note that the tabs are usually set up from right to left
–
that is, the output channels are configured, then Dirac
Live calibration is performed, then the bass management is set up.
8.6
LFE
M
GT
When movies are mixed for the cinema, each speaker is specified as a full bandwidth channel
—
that is, 20 Hz to
20 kHz, although 40 Hz to 18 kHz for the speakers is considered acceptable in cinema and the mixing studio (see
the Grammy paper
“
Recommendations For Surround Sound Production
”)
. The Low Frequency Effects (LFE)
channel is used for high-level low-frequency content and is fed to dedicated subwoofers in order to avoid
overloading the speakers.
In a typical home theatre system, some or all of the speakers are not capable of reproducing frequencies down
to 40 Hz, let alone 20 Hz. The solution is
bass management
, where low frequencies are filtered out from the
speaker channels and sent to the subwoofer instead.
This is the LFE Mgt screen:
