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Hawkins Bass Control
ANGINA CROSSOVER
The ANGINA is designed as a mono subwoofer amplifier. This means the
amplifier will direct 200 watts of pure hard-core bass to your subwoofers. It
handles these low frequencies with a Butterworth,
12dB/octave
low pass
filter.
These low pass frequencies are directed by the three position switch which
sits on top of the amplifier as shown in the shaded area below. The switch
selects from the following three frequencies; 60, 80 or 1
OOHz.
Top View of the ANGINA
t
A4 CROSSOVER
The A4 uses a
S.I.P.
(Series !n-line Package resistor network) for high pass
crossover functions (factory set at
150Hz).
However, the low pass is adjusted
using a 12dB/oct variable crossover that has a range of 50 to 220Hz as seen
in the shaded area below.
Front View of the A4
/’
IMPORTANT NOTE:
7
On
the
A4
amplifier, a full range signal can he achieved by removing
\
the
SIX
entirely.
/
Subwoofer drivers in general
j
have excellent power
han-
dling characteristics over
their operational bandwidth.
This bandwidth is deter-
mined by many factors, in-
cluding driver design, and
enclosure type. It is possible
to overdrive any subwoofer
driver by sending powerful
dB
Frequency (Hz) 50
Figure 1
signals outside of its operational bandwidth. These potentially damaging sig-
nals can be removed by adding a subsonic filter. Figure 1 shows the effective-
ness of the Hawkins Bass Control on woofer excursion in a vented enclo-
sure. The woofer travels
7.5mm
at
10Hz.
With Hawkins Bass Control prop-
erly adjusted, this excursion can be reduced to less than 1 mm. This is
oi
great benefit to lowering woofer distortion and increasing output.
With Soundstream’s Hawkins Bass Control, the boost and frequency con-
trol can provide the “tailoring” needed for any type of “assisted” design and
any woofer in any type of installation.
The
Angina
and A4 amplifiers share the same fixed Hawkins Bass Control
technology. A two position switch on the top of the amplifiers control the
‘Hawkins Bass Control’or ‘Sub Sonic’ filters as seen in the shaded area
below. When the ‘Hawkins Bass Control is engaged a 6dB boost is applied
at 45Hz. The ‘Sub Sonic’setting will engage the
13Hz
subsonic filter with nc
boost.
Top View of the ANGINA
Top View of the A4
12