Sound Performance Lab Parametric Equalizer - Manual (Page 14)

14 OPTIMIZER
The Boost/Cut controls has
two distinct functions depen-
ding on the mode you are in.
Boost and Cut as well as roll-
off
characteristics.
Fig. 1:
Dotted line:
Max. boost and cut
+/-12dB; Q = 1,5
Solid line:
Phase response
at Q = 1,5
Fig. 2:
Dotted line:
Max. boost and cut
+/-12dB; Q = 0,2
Solid line:
Phase response
at Q = 0,2
B B
O OO OS ST T
//C C
U UT T
& &
R R
O OL LL L
--
O OF FF F
CC
OO
NN
TT
RR
OO
LL
SS
The Boost/Cut control (+/-) is has two functions depen-
ding on the mode you are working in. If the rotary switch is
set to Parametric, the control acts as a conventional
Boost/Cut control providing a range of plus or minus 12dB.
In Notch, Band-pass, High-Pass or Low-Pass modes, the
control determines the roll-off characteristics of the filter res-
ponse.
In the fully anti-clockwise position, the response is gentle
while the fully clockwise position produces a steep filter res-
ponse. As the control is moved towards the center position,
the input signal is nulled with itself, with complete cancella-
tion occurring at the center or zero position.
In Notch, Band-pass, High-Pass or Low-Pass modes, this
control would normally be set at or close to its extremes,
though other settings can produce useful results if you com-
pensate for any gain loss using the Output control.
On the front panel all legends for Notch, Band-pass,
High-Pass or Low-Pass modes are printed in italics to indica-
te that the roll-off function (also in italics) applies to them.