Lse.q Theory And Use - Soundstream Reference 200 Owner's Manual And Installation Manual

LSE.Q THEORY AND USE

LSE.Q is
a
unique subwoofer
control circuit included with the
SOUNDSTREAM
amplifier. It is capable of removing
subsonic energy in program material.
The circuit consists of two controls.
O n e a d j u s t s t h e f r e q u e n c y o f
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.
frequency control (Hz)
The
the starting point of the subsonic
pass
filter. This high
adjusted from 20 Hz up to a
maximum of 60 Hz. This control is
u s e f u l f o r s e t t i n g t h e l o w e s t
frequency that your subwoofer will
see. (See figure 1)
FIG. 1 LSEQ
FIG. 4 Variable "Q"
REFERENCE500
adjusts
filter can be
The Q control
adjusts the amount of
boost applied at the set frequency.
This is adjustable from .707 (flat) to
2.8 (+9 dB). (See figure 2)
FIG. Variable 'Q
When the
(Butterworth), LSE.Q acts as a sub-
sonic filter only. (See figure 3)
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
With Q values greater than
3 dB.
,707, boost is added in addition to the
sub-sonic filter. (see figure 4)