LSE.Q THEORY AND USE
LSE.Q
is
a unique subwoofer
control circuit included with the
SOUNDSTREAM
REFERENCE
Class A 6.0 amplifier. It is capable of
removing
subsonic
energy
in
program material.
The circuit
consists of two controls. One adjusts
the frequency of operation and the
other adjusts the range of boost.
With both controls adjusted fully
counter-clockwise, no
boost is
applied and the amplifier is flat in
response down to 20 Hz.
The frequency control (Hz) adjusts
the starting point of the subsonic
filter. This high pass filter can be
adjusted from 20 Hz up to a
maximum of 60 Hz. This control is
useful for setting the lowest
frequency that your subwoofer will
see. (See figure 1)
/
I
i
LSEQ
i
Hz
Q
FREQ
BOOST
FIG. 1
LSE.Q
The Q control adjusts the amount of
boost applied at the set frequency.
This is adjustable from
.707
(flat) to
2.6
(+9
dB).
(See figure 2)
10
5
0
-5
d8
-10
-15
-20
-25
-33
FIG. 2 Variable
‘Q
When the
Q
is set to
.707
(Butterworth),
LSE.Q
acts as a sub-
sonic filter only. (See figure 3)
10
5
0
4
da
-10
-15
-20
-25
I
TO
hww'(W
xl
IW MO
FIG. 3 Variable High Pass
The simple act of removing the signal
below the vented tuning frequency can
improve system output by as much as
3
dB.
With
Q
values greater than
.707,
boost is added in addition to the
sub-sonic filter. (see figure 4)
t
-10
FW.WW
WI
1m
200
FIG. 4 Variable
‘Q
10
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