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Application
Subwoofer drivers in general have
excellent power handling character-
istics over their operational band-
width. This bandwidth is determined
by many factors, including driver de-
sign, and enclosure type. It is pos-
sible to overdrive any subwoofer
driver by sending powerful signals
outside of its operational bandwidth. These potentially damaging signals
can be removed by adding a subsonic filter. Figure 5 shows the effective-
ness of the Hawkins Bass Control on woofer excursion in a vented enclo-
sure. The woofer travels 7.5 mm at 10 Hz. With Hawkins Bass Control
properly adjusted, this excursion can be reduced to less than 1 mm. This is
of great benefit to lowering woofer distortion and increasing output.
Adjustment
An easy method of optimizing your existing subwoofer enclosure with
Hawkin’s “Hz” control is as follows.
1.Adjust frequency and boost control to full CCW position.
2.Set the bass control switch to “HAWKINS BASS CONTROL”.
3.While listening to music with strong bass content at a moderate level,
slowly adjust frequency control clockwise. Listen for a reduction of bass
response. Now, rotate frequency control slightly backwards. This serves
the purpose of removing the “subsonic” bass energy.
With Soundstream’s Hawkins Bass
Control, the boost and frequency con-
trol can provide virtually any combina-
tion of boost and cut to suit your de-
signs. So, Hawkins Bass Control can
provide the “tailoring” needed for any
type of “assisted” design and any
woofer in any type of installation.
FIG. 5 LIMITED EXCURSION
FIG. 6 VARIOUS SETTINGS