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LFE (0.1) channel level - Usually this will be set to 0.0 dB (default). However, if there is no subwoofer you
may wish to reduce the Low Frequency Effects (LFE) channel to lessen its contribution to the bass going to
the remaining large speakers. Or, even with a subwoofer, you may just wish to reduce the overall LFE level,
especially in a smaller situation such as an apartment. Note that this effects only the separate LFE (.1)
channel available on Dolby Digital and DTS material it has no effect on the reproduction of normal bass from
the front, center, or surround channels.
5. Setup Room Equalization
Sometimes it may be desirable to boost or reduce the levels above or
below a certain frequency. This might be used to make up for small
deficiencies in the listening room or speakers. The equalization can
be applied only to certain speakers. This might be used to obtain a
more consistent timbre between unmatched speakers. For example,
if only the front speakers need to have frequencies above 10kHz
boosted 1dB, then room equalization setup menu will be adjusted as
shown right.
In some home theaters the center speaker is installed behind a
projection screen. The screen will tend to cut the high frequencies.
Applying a high boost only to the center channel can compensate for
the losses introduced by the screen. Or possibly center and front left/right speakers are behind the screen. A
high boost can be applied to all three of these speakers with no effect on the surround or back speakers.
Shelving equalization helps to adjust level and frequency to aid in adjusting your room for a flat frequency
response. Room Equalization parameters are applied globally regardless of the selected user EQ (The
Variable EQ, the Loudness EQ, or the Vocal EQ). The graphs on the next page help describe how shelving
equalization can affect the frequency response for a room. Room equalization is applied in all listening
modes except DVD-Audio, Direct, and LtRt.
6. Room Resonance (Notch Filters)
No speaker has perfectly flat frequency response. These deviations in
frequency response contribute to each speaker's characteristic sound.
This is why one speaker might be preferred over another. When a
speaker is put into a room with walls, floor and a ceiling, reflected
sounds can cancel or reinforce one another which further alters the
frequency response.
At higher frequencies, hundreds of small peaks and dips can be
measured in the frequency response. Attempts to remove all these
small deviations would result in colorations to the sound that may not
be desirable. The characteristic sound that made the particular
speaker(s) attractive could be completely lost. Even if the hundreds of
small peaks and dips would be adjusted, it would only be correct for a single position in the room. Moving
your head just a few inches would require a completely different set of corrections.
At low frequencies, the picture is different. There are fewer peaks and dips, but they are much more dramatic.
The peaks and dips persist over a much larger portion of the listening area. Dips can't be corrected electroni-
cally. Putting out more power at the dip frequency won't help. If the original and reflected waves cancel each
other, they will cancel at 1 watt or 1000 watts. If you have major dips in the frequency response you can try
repositioning your speakers, particularly the subwoofer. Fortunately, dips in the bass response are typically
not that noticeable. When an instrument plays that particular frequency, the bass is lost, but the higher
harmonics of the instruments tone are still there. To some degree, your ear and brain will fill in the missing
information. Continued on next page...
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MENU SYSTEM SETUP
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