JL Audio VX400/4i Manual page 15

400w full-range 4-channel class d amplifier with integrated dsp
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EQ adjustment with Arrow Keys: You can also select EQ Band Label(s)
with your mouse/trackpad, and then make adjustments using the arrow
keys on your keyboard. Finer adjustment steps can be achieved by using
the SHIFT key, in conjunction with the arrow keys.
Keyboard commands:
Up/Down Arrows: Boost/Cut
Left/Right Arrows: Center Frequency down/up (Parametric EQ only)
CONTROL + Up/Down Arrows: "Q" Up/Down (Parametric EQ only)
Control+Left Click to select and adjust multiple EQ bands.
Individual Band Defeat:
Individual EQ bands can be defeated (turned off)
icon
located to the right of the numerical entry fields. To re-engage
them, click the icon again.
Dual or Single EQ Views:
These icons allow you to choose whether to display one or two EQ
display graphs on the screen. This way you can work on two EQ banks at
once, or just focus on one with better resolution. Linked EQs are always
displayed together, on one display graph.
Graphic or Parametric EQ Modes:
These icons allow you to switch between Graphic and Parametric EQ
modes when in the Advanced or Expert Project Levels.
IMPORTANT: YOU MAY SWITCH FROM GRAPHIC TO PARAMETRIC MODE
WITHOUT LOSING ANY SETTINGS, BUT SWITCHING FROM PARAMETRIC TO
GRAPHIC MODE RESETS THE PRESET'S EQ BANKS TO DEFAULT SETTINGS.
"CROSSOVERS" Panel:
The following controls are available for each Output Channel
A few definitions of crossover terms:
High-Pass Filter: uniformly allows signals to pass above a certain
frequency. Below that frequency, signal levels are attenuated at a
gradual rate, defined by the Filter Slope.
Low-Pass Filter: uniformly allows signals to pass below a certain
frequency. Above that frequency, signal levels are attenuated at a
gradual rate, defined by the Filter Slope.
Bandpass Filter: uniformly passes signal above a certain frequency
and below another frequency. A bandpass filter is created by
combining, in series, a high pass filter and a low pass filter on the
same signal.
Filter Alignment: determines the theoretical behavior of the
crossover (combination of signals) created between a low-pass
filtered signal and a high-pass filtered signal, assuming that both
filters are of the same slope and alignment. For most tuning
purposes, Linkwitz-Riley is the best choice.
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