Connecting Stereo Equipment With High/Speaker Level; Using Multiple Subwoofers; Set-Up Calibration - PSB HD8 Owner's Manual

schemes are different in that the Low Level Output connection at the subwoofer has
bass filtered out via a 80Hz high pass filter.
Connecting the Low Level (line level) Outputs from the subwoofer back to the
Power Amplifier Input is an important option. The Low Level (line level) of the
subwoofer are internally processed through an active high pass filter (at
12dB/octave below 80Hz) to the Low Level (line level) Outputs of the subwoofer.
Connecting the Low Level (line level) Outputs from the subwoofer back to the
Power Amplifier Inputs delivers the processed signal, with reduced low frequency
content, to the main speakers. With less low frequency demands, the main speakers
can play louder. Particularly with smaller and/or less efficient main speakers,
relieving speakers other than the subwoofer of the demands of reproducing low
frequencies will allow greater sound output and dynamic capabilities from the other
speakers and from the system overall.
C. Connecting Stereo Equipment With High Level (Speaker Level)
(see Figure 4):
You also can get excellent sonic results by connecting the High Level (speaker
level) Output of your receiver, integrated amplifier or power amplifier to the High
Level Input of the subwoofer. Use standard speaker cable and maintain polarity + ,
as well as right and left side.
D. Using Multiple Subwoofers (see Figure 5 & 6):
Particularly in difficult rooms with difficult layouts, using two subwoofers is an
alternative to smooth, as well as increase bass response. The wiring of two subs in a
system is illustrated in Figure 6. Please refer to Section V, Multiple Subwoofers for
further information.
X. Set-up Calibration
The following procedure assumes your PSB subwoofer is installed and connected.
If possible, work in a team with another person: one listening, one making
subwoofer-control adjustments.
A. Set Bass Level to 0, Crossover Frequency to 50Hz, and Phase to 0. Set any
loudness, bass and treble, and/or equalizer controls on your preamplifier or
integrated amplifier or receiver, or other components, to their nominal (midpoint
or off) positions.
B. Play a familiar compact disc, LP, or video soundtrack that includes substantial
deep-bass content over an extended section. Your PSB dealer can help you
select a few such titles.
C. Gradually turn the Bass Level 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 Crossover 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. While listening, slowly turn the Variable Phase control between 0° and 360°
several times, leaving it in the position that yields the fullest low to mid bass
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