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4
HI-PASS FILTER
Pressing this switch inserts an 18dB per octave 100Hz Hi-Pass Filter in the signal
path, immediately after the input amplifier. This is particularly useful in live PA situations
to reduce stage rumble or popping, and its use is strongly recommended, even on male
vocals. It can also be used for filtering out low frequency hum.
5 EQUALISER
The Equaliser(EQ) comprises four sections. The upper control provides H.F.(treble)
boost and cut of +/-15dB at 13kHz, and the lower control provides L.F. (bass) boost and
cut of +/-15dB at 60 Hz.
The centre two pairs of knobs are arranged as HI and LO MID frequency sections,
with a cut/boost control (lower knob) of +/- 15dB, and a SWEEP(frequency) control
which determines at which frequency the boost/cut action will be centered. These MID
sections, with a combined frequency range from 80Hz to 13kHz are particularly versatile
for vocals, enabling particular characteristics of the singer to be lifted or suppressed very
precisely.
Set the cut/boost control of each section to the centre-detented position when not
required.
6
EQ SWITCH
The EQ switch bypasses the Equalisation section when released. Alternately pressing
and releasing the switch provides an easy way of comparing the equalised and
unequalised signals.
7
AUXILIARY SENDS
These controls route the input channel signal to any one or more Auxiliary buses.
These are separate from the main outputs and can therefore provide additional outputs
for foldback, echo units or extra loudspeaker `fills.
AUX 1 & 2 are normally derived
after
the EQ section and
before
the channel fader
(PRE FADE, POST EQ), and are therefore unaffected by the fader position and mute sta-
tus. This makes them particularly suitable for foldback or monitor feeds, which need to
be controlled separately from the main P.A. mix.
Aux 3 & 4 are normally POST EQ, POST FADE, but may be selected globally to be
PRE FADE, POST EQ by pressing the appropriate AUX PRE switch on the Master sec-
tion. The AUX PRE source may also be selected as PRE EQ by internal jumpers as
decribed in Appendix 2 later in this manual.
20.0
15.0
10.0
5.0
0.0
-5.0
-10.0
-15.0
-20.0
20
100
1k
10k
20k
dB
Frequency/Hz
LF Section
20.0
15.0
10.0
5.0
0.0
-5.0
-10.0
-15.0
-20.0
20
100
1k
10k
20k
dB
Frequency/Hz
HF Section
20.0
15.0
10.0
5.0
0.0
-5.0
-10.0
-15.0
-20.0
20
100
1k
10k
20k
dB
Frequency/Hz
LMF Section
20.0
15.0
10.0
5.0
0.0
-5.0
-10.0
-15.0
-20.0
20
100
1k
10k
20k
dB
Frequency/Hz
HMF Section
