Soundstream Reference Class A 3.0 Owner's Manual And Installation Manual page 11

Application
Woofers in vented enclosures have
good power handling characteristics
above the tuning frequency, but below
the tuning frequency, power handling
drops off considerably. This is due to
the loss of any appreciable resistive air
A t f r e q u e n c i e s b e l o w
mass.
resonance, the woofer starts to
behave as if it were mounted in "free-
air". If we wish to improve the
performance of a vented system, we
s h o u l d r e m o v e t h e s e
signals from our system. These can be
removed by adding a subsonic filter.
Figure 5 shows the effectiveness of
travel is 7.5 mm at 10 Hz, with LSE.Q
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
1 Adjust frequency and boost control
to full CCW position. (See figure 6)
2 While listening to music with strong
bass content at a moderate level,
slowly adjust frequency control
clockwise. Listen for a reduction of
response.
bass
frequency control slightly backwards.
This serves the purpose of removing
the "subsonic" bass energy.
Soundstream's LSE.Q contains the
same type of circuit with the added
benefit of infinite adjustability. Our "Q"
and "Hz" control can provide virtually
unwanted
Now, rotate
11
any combination of boost and cut to
suit your designs. So, LSE.Q can
provide the "tailoring" needed for any
type of "assisted" design and any
woofer.
FIG. 5 Limited Excursion
Hz
FREQ
FIG. 6 LSE.Q Setting
FIG. 7 Various Settings
Q
BOOST