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23. Phantom power
Applies 48V DC voltage to all input XLR con-
nectors to power microphones that require it.
If phantom power is used, do not connect
unbalanced dynamic microphones or other
devices to the XLR inputs that cannot handle
this voltage. (Some wireless receivers may
be damaged, consult their manuals.) The
Line Input jacks (#1) are not connected to the
48V supply, and are safe for all inputs (balanced
or unbalanced). An unbalanced-to-balanced
impedance converter such as the Peavey 5116
or 7201 (female XLR), or a Peavey 1:1 interface
adapter can also be used to isolate the mic input from 48V. Phantom
power is not available at the talk back mic connector.
24. Stereo Input
High-impedance input for line-level signals. The left/mono input
supplies signal to both the left and right inputs if there is nothing
inserted to the right input jack.
21. Pad
Attenuates the input signal by 10 dB. This will increase the dynamic range to
accommodate a higher input level before clipping which may be necessary when
close miking loud guitar amplifiers or drum kits.
22. Polarity
Reverses the polarity of the input signal. This will compensate for an out-of-phase
input that would otherwise cause frequency cancellations in the mix. (Often needed
for drum mics where both sides of the drum head are picked up in multiple microphone
situations.)
25. Trim
Varies the gain of the stereo input to optimize the signal-to-noise ratio.
The adjustment range is unity to +20 dB. Proper adjustment will
maximize the signal-to-noise ratio, and can be set using the PFL
switch. (See #4)
Master Functions
26. AUX Master Level
Sets the overall level of the AUX signal that is sent to the output jack. (See #49)
27. AUX PFL/Clip
A dual function LED that illuminates when the signal level is nearing the over-
load point, or if the PFL switch is engaged. It illuminates at +19 dBu. (There
is roughly 2 dB of headroom remaining when it lights.) When the AUX PFL
switch (#28) is depressed, it lights continuously to indicate that this AUX has
been assigned to the PFL mix.
28. AUX PFL
Connects the AUX signal (pre-master level) to the PFL mix and switches the
headphone/control room source from the L-R mix to the PFL mix. It also
connects the PFL signal to the L-R meters to aid in monitoring the output level.
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