JBL SDP-3 Installation & Technical Manual page 61

AC-3 Effects and Parameters
JBL Synthesis
MASTER LEVEL adjusts the output level of the two-channel downmix.
This control should be set to +5dB unless the LFE is very heavy, in which
case the level should be reduced.
RE-EQUALIZER equalizes the left, center, and right channel outputs to
match the overall frequency balance of the original recording. Without
this re-equalization, many films and some television programs will
sound too bright.
REAR DELAY OFFSET is an additional delay added to the rear
channels when listening to LOGIC 7 and ROCK/POP. This delay
increases the apparent size of the listening space by increasing the rear
delay time. Feel free to experiment to find the setting that works best.
REAR LEVEL controls the volume level of the rear speakers. Although
we have selected a default value, the correct setting will vary with each
recording, the room, and your personal taste.
SIDE LEVEL controls the output level of the side speakers. Use this
control in conjunction with REAR LEVEL to achieve the optimum
balance between the side and rear speakers.
SOUNDSTAGE controls the level of the surround speakers relative to
the front speakers in a dynamic way. The SDP-3 attempts to detect
whether or not the sound source was originally encoded from a surround
source by looking for occasional bursts of rear-steered material, and by
identifying the directional orientation of the background sound between
strong sounds. Whenever there is an indication that the source was
originally surround encoded, the Soundstage control automattically
reverts to the REAR setting — which gives the rear speakers full level.
The NEUTRAL position attenuates the rear speakers 3dB. The FRONT
position attenuates the rear speakers 6dB. The effect is to move the
listening position forward in the listening space.
SUBWOOFER LEVEL boosts or cuts the subwoofer output level.
Although the normal subwoofer level is set during the calibration
procedure, with some recordings it may be desirable to increase or
decrease this deep bass level.
SURROUND MIX allows independent adjustment of the level of the
surround channels. Many AC-3 encoded soundtracks sound better
when down-mixed to two channels with the surround level increased by
approximately 2-3dB.
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