JL Audio VX400/4i Manual page 17

"DELAY/POLARITY" Panel:
The TwK™ has a powerful digital delay feature with separate entries for
Speaker Distance and Additional Delay, which can apply over 24 feet of
speaker distance compensation (21.3 milliseconds of delay) to each of its
output channels. Among other things, this delay capability allows you to
compensate for the unequal distances between the primary listener and the
various speakers installed in the vehicle. This is very useful if you are using
delay to optimize the sound for one listening position. Once you have the
measurements set corresponding to the speaker distances in the vehicle, you
can adjust the Additional Delay control for additional effect.
Speaker Distance: Use this tool to establish the baseline delay
correction. Simply enter the distance from the speaker(s) connected
to a given output channel and the primary listener's head. This can
be done in inches or centimeters, switchable in the Preferences panel.
The maximum Speaker Distance that can be entered is 290.4 inches
(737.7 cm). The TüN™ software will automatically convert the Speaker
Distances entered into Time Delay values, expressed in milliseconds
(ms), and displayed in the TUNE tab's "Total Delay" displays. You can
also establish different Speaker Distance setups for different listening
positions in the vehicle, by creating a PRESET for each one and entering
the appropriate values.
Additional Delay: Here, you can add delay to the baseline delay
correction. Clicking the arrows moves the value approximately 0.2 ms.
Holding the "Shift" key, while clicking the arrows, results in a step value
of 0.02 ms, which is the minimum delay step value. Any entered values
will be rounded up to the nearest available delay step.
Total Delay: Displays the total delay that is applied to the signal (the
sum results of the Speaker Distance and the Additional Delay entries).
This is a display-only field.
Polarity: Inverts the POLARITY of each output channel's audio signal
when the
positive and negative connections on the loudspeaker(s) connected to
a given output signal. Adjusting POLARITY relative to other channels
can be useful for improving the acoustical performance of crossovers in
the vehicle, and can also be used to create spatial effects.
"OUTPUTS" Panel:
Level Trim: Each Output Channel has a level trim control with a range
of –12.0 to +12.0 dB. The default setting is 0 db. These are the primary
tuning controls used to adjust the relative level of the TwK™ Output
Channels to achieve the desired balance in the audio system.
Output Labels Display: Displays the Output Channel Letter ID and the
Channel Labels. The Channel Labels are created by the Setup Tool, or by
the user in the SETUP tab. They can be edited within the SETUP tab,
if desired.
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position is selected. This is equivalent to reversing the
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