Expert Mode - JL Audio VX400/4i Manual

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Passband: the range of frequencies uniformly passed by a filter.
Defined by two frequencies.
Stopband: the range, or ranges of frequencies outside
the passband.
The TüN™ software provides separate controls for adjusting a High-
Pass Filter and a Low-Pass Filter on each Output Channel. These can be
combined to create a Bandpass Filter. Each filter section contains the
following controls:
Frequency: allows adjustment of the filter frequency (in Hz) via
direct numerical entry with the keyboard, or incrementally via the
arrows located next to the displayed value. Holding "Shift" down
when clicking results in finer resolution steps.
Slope: A pull-down menu allows selection of crossover slopes and
filter alignment from a list of available choices:
Basic and Advanced Mode:
12, 24 or 48 dB per octave, Linkwitz-Riley alignment (L-R).

Expert Mode:

All of the above, plus 6 dB per octave and
12, 18, 24, 36, 48 dB per octave, Butterworth alignment (BW)
Some basic guidelines for setting filter frequencies and good
starting frequencies for tuning a system (use 24 dB/octave
L-R slope):
2-way System:
Coaxial/Component System with passive crossover between
woofer and tweeter: 80 Hz High-Pass
Subwoofer: 80 Hz Low-Pass
3-way System:
Tweeter: 5000 Hz High-Pass
Component woofer: 80 Hz – 5000 Hz Bandpass
Subwoofer: 80 Hz Low-Pass
4-way System:
Tweeter: 5000 Hz High-Pass
Midrange: 500 Hz – 5000 Hz Bandpass
Midbass: 80 Hz – 500 Hz Bandpass
Subwoofer: 80 Hz Low-Pass
Passband Bar display: shows, at a glance, the approximate
passband (bandwidth) of the signal on each channel, based on
the crossover frequencies that have been selected. Clicking on the
Passband Bar Display will open a window with a large, detailed
view of the crossover filter's response. Once this window is open,
you can show and hide channels to evaluate the crossover settings.
The detailed crossover response view can also be called up by
clicking on the Crossover menu .
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