10
Reference1000s
15
LSE.Q THEORY AND USE (continued)
frequencies below 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 should remove
these unwanted signals from our
system. These can be removed by
adding a subsonic filter. Figure 5
shows the effectiveness of LSE.Q on
woofer excursion. Woofer 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 LSE.Q's “Hz” control
is as follows.
1Adjust frequency and boost control to full
CCW position. (See figure 6)
2While 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.
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 any combination of boost
and cut to suit your designs. So,
LSE.Q can provide the “tailoring”
needed for any type of “assisted”
10 Frequency (Hz) 50 100 200
Xd
(mM)
8.0
7.0
6.0
5.0
4.0
3.0
2.0
1.0
0.0
FIG. 5 Limited Excursion
NOTE: The LSE.Q circuit on the REF1000s can be defeated for flat
operation down to 20 Hz by placing the LSE.Q switch in the "OUT"
position. You may wish to use this option to achieve a higher S/N Ratio
when using ultra-high efficiency speakers, such as compression
FIG. 6 LSE.Q Setting
dB
Frequency (Hz)
-20
-30
10
-25
-15
-10
5
0
-5
10
50 100 200
FIG. 7 Various Settings
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