COBY DVD978 - Manual (Page 39)

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System Setup
Channel Delay
Set the delay time for the center, rear speakers and the subwoofer.
You may need to set a delay to compensate for the difference in
audio propagation times caused by the distance of the speakers to
the listener.
Use the navigation keys <UP> or <DOWN> to select a speaker,
then use the navigation keys <LEFT> or <RIGHT> to adjust the
distance differential.
This unit does not support delays for when the distance between
the center or surround speakers and the listener are greater than
that between the front speakers and the listener.
In case the channel delay settings cannot match your speaker
configuration, set all distances to 0 cm.
Equalizer
Sound Mode
Select a sound mode in this item.
Bass Boost
Set it to ON to boost the bass sound.
Super Bass
Set it to ON for an extreme super bass sound effect
Treble Boost
Set it to ON to boost the treble sound.