Peavey X-VCA - Manual (Page 7)

p. 7
mono input module
features
phantom power +48V
48 volts DC is applied to pins 2 and 3 on the mic-input XLR connector. This
option is used with condenser microphones and active direct boxes that require
an external DC voltage (phantom power) in order to operate.
pad
The mic-input signal is attenuated by 20dB to prevent some signals (e.g. kick
drum or lead vocal) from overloading the preamp stage.The pad is used to bring
a hot mic-input signal down to a controllable level.The 20dB pad is not functional
when the
LINE switch is depressed.
line
The input preamp circuit is set up to accept a mic-level signal. This signal is
brought in via the XLR mic-input connector located on the rear panel.The 1/4"
TRS input jack is disabled.
The input preamp circuit is set up to accept a line-level signal from either
the XLR mic-input connector or the 1/4" TRS input jack, both located on the rear
panel.When a plug is inserted into the 1/4" TRS input jack, the XLR mic-input
connector is disabled.
polarity reverse—ø
This feature is used for correcting or minimizing polarity and phase related errors.
For example, occasionally a balanced input connection is reverse-wired before it
gets to the mixing console.This can happen in microphones, or in snake line inter-
faces. By using the polarity reverse feature, this type of error can be corrected.
polarity inverted
polarity not inverted
If the 48V phantom
power switch is
engaged, depressing this
switch disconnects phantom
power from the mic input
XLR.
+
1
When similar signals
from different chan-
nels are combined, phase
cancellations can occur.
Reversing the polarity of an
input signal often corrects
such phasing errors.
+
The 48V switch should
not be engaged when
using standard (dynamic)
microphones, or other
sources that do not use
phantom power.
a