4
ISA TWO CONTROLS AND FEATURES
Front Panel
Channel Controls
Input Selection
Each press of the
Input
button steps through the three available input sources: Mic/Line/Instrument.
Phase
Pressing
Phase
inverts the polarity of the selected input. This can be useful when multiple mics are
used in close proximity (ie., on a drum kit).
Mic Input Gain
The
Gain
switch adjusts the mic gain in three 10 dB steps. Its range is either 0–30 dB or 30–60 dB
when the 30–60 switch is pressed. An additional 0–20 dB of continuous gain adjustment is available
using the
Trim
control.
To avoid an excessive jump in level, It is recommended that the stepped Gain switch is turned to minimum before
pressing the 30-60 switch.
Before starting a recording, or if used for PA/live work, set the Trim control to near its centre position. This will allow
for some gradual gain adjustment up or down without the use of the stepped control.
Channel 1
Channel 2
Power
switch
Instrument
inputs
LED
meters
Applies
+48V
phantom power to
the mic input XLR
Inverts polarity
(
Phase
) of the
selected input
Input
Trim
pot
Mic/Line: 0 +20 dB
Instrument: +10 +40 dB
Applies the
variable-frequency
high-pass
Filter
to
the selected input
Filter roll-off
frequency
pot
Mic and
Instrument input
impedance (
Z In
)
selection
Switches the external
Insert
return into the
channel path
Input
source
selection
Selects the high
(
30-60
dB) mic
gain range on the
Gain switch
10 dB stepped Mic/
Line
Gain
switch
Mic: 0-30 / 30-60
Line: -20 +10
