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Hawkins Bass Control
-
Theory and Use
SUB
. HAWKINS
PHASE
SONIC BASS CP*1800
CONTROL
r
HAWKINS
1
X*OVER
FREQ BOOST
LP
HZ
4
HAWKINS 30-70
Hz
SUBSONIC 1
J-30
Hz
Hawkins Bass Control (parametric)
is a unique
subwoofer control circuit included with the
Soundstream RUBICON501/ amplifier. It is ca-
pable of removing subsonic energy in program
material while boosting subwoofer frequencies.
The circuit consists of two controls. One adjusts
the frequency of operation and the other adjusts
the range of boost. With both controls adjusted
fully counter-clockwise, no boost is applied and
the amplifier is flat in response down to 20 Hz.
FIG.BASS
CONTROL
quency control (Hz) adjusts the
5
starting point of the subsonic filter.
o
On the RUBICON501/ the high pass
dB
-5
filter has two frequency ranges.
When the bass control switch is set
to “SUB SONIC”, the high pass filter
frequency can be adjusted from 13
Hz up to a maximum of 30 Hz. In
this setting, no boost
“Q”
control is
,.
available. This control is useful for
5
setting the lowest frequency that your
0
subwoofer will see (see figure 1). dB
3
When the bass control switch is set
1::
to “HAWKINS BASS CONTROL”, the
-20
high pass filter frequency can be ad-
-25
justed from 30 Hz to a maximum of
-301
70 Hz. In this setting, there is an
available boost control of 0 to
+9
dB.
FIG. 2 VARIABLE
“Q”
FIG. 3 VARIABLE HIGH PASS
-5
dB
-10
The Boost control
adjusts the amount
of level applied at the set frequency.
This is adjustable from flat
(OdB)
to
+9
dB.
(See figure 2)
When the Boost is set to 0, Hawkins
acts as a sub-sonic filter only. (See
figure 3) The simple act of removing
potentially harmful low frequencies can
improve system output by as much as
3
dB.
(see figure 4)
FIG. 4 VARIABLE BOOST
9