Soundstream Technologies HR 4 - Manual (Page 12)

Application
Subwoofer drivers in general have excellent
power handling characteristics over their
operational bandwidth. This bandwidth is
determined by many factors, including driver
design, and enclosure type. It is possible 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 effectiveness of
the Hawkins Bass Control on woofer excursion in a vented enclosure. 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 Hawkins’
“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 control can
provide virtually any combination of boost and
cut to suit your designs.
So, Hawkins Bass Control can provide the
“tailoring” needed for any type of “assisted”
design and any woofer in any type of
installation.
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FIG. 5 LIMITED EXCURSION
FIG. 6 VARIOUS SETTINGS