12
PHANTOM POWERING
The use of professional condenser micro-
phones requires so-called phantom powering.
The MIC-AMP C360 offers stabilized 48V
phantom powering, which is activated by the
"PHANTOM"-button on the front panel.
This voltage is applied to pins 2 and 3 via
matched 6.8 kOhms resistors of
both
input
connectors.
Active phantom powering is indicated by a red
"48V"-LED.
NOTE:
Switching the phantom power during operation
produces low-frequency voltage swing at the
MIC-AMP C360's output. To avoid damage of
monitor loudspeakers or other equipment, the
subsequent input should be muted when
pressing the "PHANTOM"-switch.
NOTE:
If unbalanced equipment such as synthesizers
etc. are connected to the MIC-AMP C360's
inputs, the 48V phantom voltage might cause
damage if the connection is not made properly.
This problem is faced with all phantom
powered inputs and can be avoided by using a
transformer coupled D.I. box or by strictly
keeping the unbalanced wiring apart from pin 1
(ground).
GAIN SETTING
The input signal applied to the XLR terminal is
fed to an extremely low-noise integrated
instrumentation amplifier.
Gain is set by the "GAIN"-rotary switch in 6dB
steps from 0 to +66 dB.
The deviation from the indicated value is less
than +/- 0.3 dB.
PHASE REVERSE
In multiple microphone applications, inverting
one or several microphones´ phase can
significantly improve the the overall mix.
Reason therefore may be position-dependent
time lags between microphones or, in the worst
case, an incorrectly soldered microphone lead.
The "PHASE"-switch inverts signal polarity and
is confirmed by the yellow "REV"- LED.
THE OPERATION
