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Bass Summing - The SSD-66 (5.1) has the ability to work a bass signal in three different
ways. The first is only used when all speakers are large enough to handle full bass
information and where the subwoofer is only used for low frequency effects similar
to a movie theater's setup. This "bass sum" setting is "LFE ONLY = SUB". The
more common bass sum setting is a sum of the five speaker channels bass infor-
mation in addition to the LFE channel (low frequency effects). This "LCRS +
LFE=SUB" setting is to be used in most theater setups. The final bass sum setting
is specifically designed for DTS playback. When listening to DTS recordings, the
bass sum filter should be set to "SUM -10DB=SUB" which reduces the heavy bass
level found in most DTS recordings. Thus, when switching from an non-DTS input
to a DTS input, the bass volume level does not need to be altered.
Bass Redirect - The SSD-66 (5.1) has the ability to redirect the bass information from a
number of different channels to either the subwoofer or other channels. This is
useful based on speaker configurations and surround mode and is therefore an
Acoustical Parameter per Input Label rather than a Global Parameter.
Bass Level per Input Label - Bass volume level can be set per Input Label as bass will vary
greatly per mode and source type. While the bass level for all Input Labels has
already been set using Pink Noise (see page 35), the bass level can now be altered
and stored per Input Label. For this procedure, it is recommended that a music,
broadcast, or film source be in play as the adjustments are made per Input Label.
As the new bass level is set and stored for each Input Label, it will track the volume
with respect to the other channels.
For example, if Input Label #1 has the main five channels set to a volume level of -
22 dB (overall) with each channels volume level at R=-23, L=-24, C=-23, RS=-22,
& LS=-23, Input Label #2 will also have these same settings when selected (as-
suming volume is not changed prior to switching Input Labels). Furthermore, Input
Label #1 can have a bass level of SUB=-28 while Input Label #2 has a bass level of
SUB=-25. Again, when switching from Input Label #1 to Input Label #2, assuming
volume has not been changed, while the main five channels will remain the same,
the bass level will not. Please note, that the overall volume level is based on the
highest level of all six channels, in this case RS. As volume is raised and lowered
for ALL speakers, the bass level will raise and lower in proportion to the bass level
for each Input Label.
Please note, that the reading for ALL channels (master volume level) will display
the highest channel's volume setting. If the subwoofer level for one Input Label is
greater than any of the other channels volume setting, the master volume level will
seem to alter as you switch to an Input Label that has another channel as the
highest volume level.
Default Mode - Each Input Label can have its own default mode such that when that input is
selected, the SSD-66 (5.1) will automatically switch to a preprogrammed surround
sound mode. This is especially useful if more than one input label is selected for
the same source component. For example, if a TV Tuner source has two Input
Labels assigned to it, TV SURROUND and TV MONO, the TV SURROUND Input
Label will have a Pro Logic default mode accessed when viewing movies and the
TV MONO Input Label will have a mono default mode for viewing news broadcasts
or other non-stereo broadcasts.
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