Onkyo TX-SR601E Instruction Manual page 59

Audio Adjust
Front Expander
In the Theater-Dimensional mode, the front expander function
spreads out the stereo image in front of the listener. The created
stereo image is as if the front speakers have been farther apart for
the feeling of a wide sound space. This is especially useful for
narrow listening angles of 20 degrees or less.
On: Select to turn on the front expander function to simulate a
wider sound space.
Off: Select to turn off the front expander function for a normal
sound space.
Virtual Surr Level
In the Theater-Dimensional mode, this setting adjusts the level of
the virtual surround signal. This can be set from –3 to +3 decibels.
Lowering this setting can improve the sound when the definition is
unclear or when the sound feels unnatural.
Dialog Enhance
If the dialog from the center channel is difficult to hear in the
Theater-Dimensional mode, use this setting to improve the clarity.
On: Select to enhance the vocal ranges of the center channel
signal.
Off: Select to output the center channel signal at the regular
level and frequency characteristics.
Front Effect (Orchestra, Unplugged, Studio-Mix, TV Logic,
Enhance, Mono Movie)
Some live recordings contain acoustic reverberation. When you
play these sources, more reverberation will be applied by the DSP,
creating too much reverb effects and the sound loses frame or
presence. In this case, set this setting to "Off" so that no
reverberation from the DSP will be applied to the sound output
from the three front channels. With this setting, the sound source is
played as it is without any further reverberation.
Reverb Level (Orchestra, Unplugged, Studio-Mix, TV Logic,
Enhance, Mono Movie)
This setting allows you to adjust the depth of acoustic reverberation
to match the playback source material, the acoustics of your room,
and such other factors.
Select from the three settings "Low," "Middle," and "High."
Reverb Time (Orchestra, Unplugged, Studio-Mix, TV Logic,
Enhance, Mono Movie)
Adjust the reverb time to match the source being played back and
the acoustics of the room. Select from the three settings "Short,"
"Middle," and "Long."
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