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page 15
The following selections can be made in the config.speaker menu by using naviga-
tion keys described above:
Left speaker (L): SMALL or LARGE
Right speaker (R): SMALL or LARGE
Center speaker (C): SMALL or LARGE or OFF
Surround left speaker (SL): SMALL or LARGE or OFF
Surround right speaker (SR): SMALL or LARGE or OFF
Subwoofer (SUB): ON or OFF
The bass signal directed to speakers selected as SMALL, will be re-routed to the -
subwoofer, or the L,R speakers (bass management).
If a speaker is turned off, the sound signal will be sent to the remaining speakers,
which are selected as active (down mixing).
Special attention should be given to the subwoofer management:
For Dolby Digital 3/2 and DTS input stream a special low frequency channel (LFE) is
normally included, which is indicated with a “.1” after the input stream indication, e.g.
3/2 .1 . The LFE channel produces an output at the subwoofer. That means even if
all speakers are chosen LARGE, where no signal is send to the subwoofer by the
bass management, signal will be send to the Subwoofer from the LFE input channel.
For Stereo and ProLogic II no LFE channel is present. And if all speakers are
chosen LARGE, the bass management does not send any signal to the subwoofer.
In this case to have a subwoofer signal, the user can select the subwoofer – max
bass ON option under the config.cross freq menu. In this case PR250 B takes the
summed full range signal from the L and R channels and send to the subwoofer.
In case of using subwoofer (subwoofer is activated) in Stereo and Pro Logic mode,
the user should therefore decide:
a ) Select L and R (or L,R,C,SL,SR in Pro Logic) to be SMALL. Then the low
frequencies will be send to the subwoofer by the bassmanagement. The
crossover frequency is set in the config.cross freq menu.
or
b) Select L and R (or L,R,C,SL,SR in Pro Logic) to be LARGE and then select
Subwoofer – max bass ON in the config.cross freq menu. In this case the full
range summed mono signal from the other channels, will be send to the
subwoofer.
The implication of b) is that “double bass” is present in the system. That means the
user should eventually chose a lower gain setting for the subwoofer, e.g. –4 to –8 dB
depending on the sensitivity of the subwoofer relative to the other speakers.
The b) situation can be useful in situations, where the L, R speakers can handle
deep bass information and extra bass is required.
If the L and R speakers are not so well suited for the lowest frequencies, then chose
a), eventually with lowest 60Hz cross over frequency.