JL Audio e110 Owner's Manual page 15

| e110 & e112
Crossover Switch
Th e "crossover" selector switch determines the operating mode of the E-Sub's
built-in active crossover.
"Off " defeats the crossover fi lter, completely removing this circuit from the
signal path and is most useful when using a receiver or preamp/processor's fi lters
and bass-management features.
"On" activates the on-board active crossover. Th is crossover consists of a 24
dB/octave low-pass fi lter for signals feeding the E-Sub's internal amplifi er, plus
a 24 dB/octave high-pass fi lter feeding the "Line-Outputs" on the E-Sub's rear
connection panel. Th is is most useful when integrating the E-Sub into a two-
channel audio system.
Crossover Frequency Knob
Th e "crossover freq. (Hz)" selector knob allows the user to choose the
crossover frequency of the E-Sub's built-in, active crossover. It has no eff ect when
the "crossover" switch is in the "off " position. Th e frequency is variable from 25
Hz (full counter-clockwise) to 130 Hz (full clockwise). 80 Hz is a commonly used
fi lter frequency and usually serves as a good starting point for adjustments.
Polarity Switch
Th e "Polarity" switch allows the user to select between normal (0 deg) and
reversed (180 deg) signal polarity. Th e "Polarity" switch will primarily aff ect the
small frequency range around the crossover point between your subwoofer and
satellite speakers.
Unlike the "phase (deg.)" control, which eff ectively adds time delay, the
"Polarity" switch produces an instantaneous reversal of the signal's amplitude
peaks. For example, if at a given reference point a sine wave has an amplitude
peak, by fl ipping the "phase (deg.)" switch you instantly convert that peak
into a trough or amplitude dip. Because the eff ect of the "Polarity" switch
is immediate, it compliments the operation of the "phase (deg.)" control and
cannot be replaced by it.
When placing your E-Sub in the room, experiment with the "Polarity "switch
before adjusting the "phase (deg.)" control. Either position of the "Polarity" switch
may provide a smoother transition between your E-Sub and the satellite speakers.
Use source material with good mid and upper bass content for evaluation.
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