PSB Speakers PSB SubSeries 500 Guide D'utilisation page 15

substantial deep-bass content over an extended section. Your PSB
dealer can help you select a few such titles.
C. Gradually turn the Sub Volume control clockwise until you achieve
natural balance between the subwoofers deep-bass output and your
main left and right loudspeakers.
D. Slowly turn the Sub Cut-Off Frequency control clockwise to reach
the best mid-bass blend with your main left and right speakers. This
will be the point at which the upper bass retains solid impact and
fullness. Boom or muddiness is the result if the control is too high. A
thin, "reedy" quality to the mid-bass such as deep male voices (FM
announcers; Darth Vader) is the result if the control is too low.
E. Adjust the Phase control between 0° and 360° several times,
leaving it in the position that yields the fullest low to mid bass output.
You will now probably want to repeat steps C & D to double-check
the subwoofer blend.
Cycling through steps C & D several times with slightly different settings
of both the Sub Volume and Sub Cut-Off Frequency controls will help you
get the most musical performance from your PSB Subwoofer and your
system. The best combination is that which yields the most solid very-
low-bass sounds, without mid-bass boom or a gap in response between
the subwoofer and the main speakers.
As you will discover, the Sub Cut-Off Frequency and Sub Volume
controls are interactive. Raising the latter while lowering the former can
have the effect of extending deep-bass response somewhat, with a small
sacrifice in overall loudness capability (this will still be well beyond the
full-range loudness capability of most systems). In general, for well-
recorded acoustic music the lowest Sub Cut-Off Frequency setting that
yields a smooth transition between subwoofer and main speakers is
often the best choice, and will promote deeper low-bass extension.
Note: The Sub Volume control is not a bass-boost or volume control. It is
a set-and-forget adjustment, not intended for day-to-day adjustment. Use
your preamplifier or receiver/integrated amp tone controls to modify
program tonal balance.
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