SoundCraft Spirit Live 4 - Manual (Page 14)

7. HI- PA SS FILTER
Pressing this sw itch inserts a 12d B p er octave 100H z H i-Pass
Filter in the signal p ath, im m ed iately after the inp u t am p lifier.
This is p articu larly u sefu l on live vocals, and its u se is
strongly recom m end ed , even on m ale vocals. It can also be
u sed for filtering ou t low frequ ency hu m .
8. EQ UA LISER
The Equ aliser(EQ) com p rises three sections. The u p p er
control p rovid es H .F.(treble) boost and cu t of +/ -15d B. The
low er tw o p airs of knobs are arranged as a cu t/ boost control
(low er knob) of +/ - 15d B, and a SWEEP(frequ ency) control
w hich d eterm ines at w hich frequ ency the boost/ cu t action
w ill be centered . The LF sections are essentially Sw ep t Low
Frequ ency controls, covering a range from 40 to 400H z and
p rovid ing m u ch greater flexibility than a conventional
LF(bass) control. The MID section, w ith a frequ ency range
from 250H z to 8kH z is p articu larly versatile for vocals,
enabling p articu lar characteristics of the singer to be lifted or
su p p ressed very p recisely.
4.0
3.0
2.0
1.0
0.0
-1.0
-2.0
-3.0
-4.0
20 100 1k 10k 20k
dB
Frequency/Hz
HI-Pass Filter
20.0
15.0
10.0
5.0
0.0
-5.0
-10.0
-15.0
-20.0
20 1k 10k 20k 100
dB
Frequency/Hz
LF Section
Frequency Re sponse Curves of the Hi- Pa ss Filte r
Frequency Re sponse Curves of the Equa lise r
IN PUT
Pa g e 12