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ADVANCED SUBWOOFER CONTROLS
Volume
Setting the level too high will cause the bass to seem bloated and is the single most common
cause of bad sounding subwoofers. A rule of thumb is that the subwoofer should not draw
attention to itself, but should simply make the systems low end seem more extended and
accurate. Different content has different levels of output so adjust volume based on source
material and your personal preference.
Low Pass Filter
Enables smooth sonic transition and flat frequency response between speakers and the
subwoofer. This allows you to control the upper frequency cut-off to blend with main speakers.
It also allows you to adjust slope, or the rate at which the low pass filter rolls off. If using an AV
Receiver with a Subwoofer Output, leave in the OFF position.
Phase Adjustment
Solves sound wave cancellation issues at specific frequencies and perfectly aligns the arrival of
output from speakers and subwoofers to your listening position. Normally set to 0° if the
subwoofer is near the main speakers. Adjusting Phase shifts timing of the subwoofer output to
align with the main speakers or additional subwoofers.
Polarity
In some cases, reversing polarity solves dips or humps at the crossover frequency between a
subwoofer and speaker and can be used to fix bass nulls or overly boomy spots in the listening
area. Reversing the electrical polarity of the subwoofer amplifier makes it so the woofer moves
in when speaker drivers move out and is normally set to positive
Parametric EQ
Powerful tool for removing peaks and dips in your listening area, and for creating custom
subwoofer output based on personal listening preferences. Works best when used with acoustic
measurements.
Allows you to set the desired center frequency of the filter, increase or decrease the SPL dB of the
filter, or adjust the bandwidth of the filter.
Room Gain Compensation
Fixes bloated sounding bass by optimizing low frequency output and extension when too much
sound wave density is being created by a small room.
PB-4000
SUBWOOFER
page 16 | owner’s manual
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