JL Audio DOMINION d110 Owner's Manual page 15

0 0
max
Master Level
225
180
90
45 270
0 280
phase (deg.)
Polarity
270
0
0 | 180 deg.
)
| d108 & d110
Master Level Knob
The "Master Level" Knob is used to set the output level of the Dominion™,
relative to the rest of the audio system.
When rotated fully counter-clockwise, the subwoofer's output will be
completely muted. When at the "0" or vertical position, the level is at reference
gain. When turned fully clockwise, the subwoofer's level is at maximum
sensitivity (loudest).
phase (deg.) Knob
The "phase (deg.)" control knob allows the user to adjust the timing of the
subwoofer output relative to the main speakers. The "phase (deg.)" control will
primarily affect the small frequency range around the crossover point between
your subwoofer and satellite speakers. The "phase (deg.)" control's degree labeling
is referenced to 80 Hz, since this is the most common crossover point between
satellite speakers and a subwoofer. Phase settings between 0 degrees (full counter-
clockwise rotation) and 280 degrees (full clockwise rotation) are possible.
Speaker, subwoofer, and listening seat positions vary greatly in home
theater installations. Since physical positioning of speakers relative to the room
boundaries and each other greatly affects the perceived quality of sound output,
sometimes it is helpful to delay the subwoofer output. This is exactly what occurs
when you turn the "phase (deg.)" control beyond 0 degrees.
Once your Dominion™ has been placed in your listening room to give
you the smoothest overall sound, and after you have determined the
optimum "Polarity" switch position (see following section), experiment
with the position of the "phase (deg.)" control. Using familiar source
material with good mid and upper bass content, adjust the "phase (deg.)"
control and listen for better defined mid-bass and a smoother transition
between the subwoofer and satellite speaker systems. If no single setting
sounds better than another, leave the "phase (deg.)" control at 0 degrees.
Polarity Switch
The "Polarity" switch allows the user to select between normal (0 deg) and
reversed (180 deg) signal polarity. The "Polarity" switch will primarily affect the
small frequency range around the crossover point between your subwoofer and
satellite speakers.
Unlike the "phase (deg.)" control, which effectively 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 flipping the "phase (deg.)" switch you instantly convert that peak
into a trough or amplitude dip. Because the effect of the "Polarity" switch is
immediate, it compliments the operation of the "phase (deg.)" control and
cannot be replaced by it.
When placing your subwoofer 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 Dominion™ and the satellite
speakers. Use source material with good mid and upper bass content for evaluation.
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