MC
-
Tiieory
and Use
(502
&
1002)
‘“’
m
%ER
SONIC
HAWKINS
BASS
CONTROL
r
HAWKINS
1
FREQ
FREQ
BOOST
110
@;.
.g.
,c3,
.L.p.
H.P:
XOVER*70-160
Hz
XOVE R
1
HAWKINS*30-70Hz
SUBSONIC
9
13-30Hz
FIG.
1
BASS CONTROL
Hawkins Bass Control (parametric)
is a unique
subwoofer control circuit included with the
Soundstream
RUBICON
and 1002 amplifiers.
It is capable of removing subsonic energy in pro-
gram material while boosting subwoofer frequen-
cies. 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 ap-
plied and the amplifier is flat in response down to
20 Hz.
10
The frequency control (Hz)
adjusts
5
the starting point of the subsonic fil-
o
ter.
On
the
RUBICON
and
1002,
dB
-5
-10
the high pass filter has two frequency
-15
ranges. When the bass control
-20
switch is set to “SUB SONIC”, the
-25
high pass filter frequency can be ad-
-30
justed from 13 Hz up to a maximum
of 30 Hz. In this setting, no boost “Q”
,.
control is available. This control is
5
useful for setting the lowest frequency
0
that your subwoofer will see (see fig- dB -5
ure 1). When the bass control switch
-10
-15
FIG. 2 VARIABLE
“Q”
is set to “HAWKINS BASS CON-
-20
TROL”, the high pass filter frequency
-25
can be adjusted from 30 Hz to a maxi-
-30,
mum of 70 Hz. In this setting, there
FIG. 3 VARIABLE HIGH PASS
is an available boost control of 0 to
+9
dB.
-5
dB
-10
-15
-20
-25
-30
FIG. 4 VARIABLE BOOST
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)
12
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