Extron Electronics DMP 128 User Guide - Manual (Page 36)

Mic/Line input signal chain controls
The input signal processor chain allows adjustments to program or microphone audio
material before input to the main mixer.
gain control (gain)
The gain control provides a single long-throw fader with a range of
– 18 dB to +80 dB, adjustable in 1 dB increments with the fader or
in 0.1 dB increments using direct entry in the level setting readout
below the fader. The peak reading meter holds the peak level for
one second, displaying it numerically in the box below the meter.
The default setting is unity gain (0.0 dB).
The Phantom Power checkbox, turns the +48 VDC phantom
power on (checked) and off (unchecked). Phantom power is typically
used to power a condenser microphone.
The Mute button, silences the mic/line input.
The Polarity button, allows the polarity of wires connected to
the audio connectors (+/tip and – /ring) to be flipped to correct for
miswired connectors.
Filter (FiLt)
Each filter block allows a total of five filters. The first filter is inserted from a processor list
that opens when the block is double-clicked or by selecting it from a context list when the
block is right-clicked (see figure 21).
Figure 21. Insert Filter menu
Once inserted, double-click the processor block to change parameters of the filter. After
the first filter is inserted, up to four additional filters can be added to the filter block using
the dialog box. Select the desired filters from the following list using the drop-down boxes:
• High pass filter — A high pass filter passes a band of frequencies extending from a
specified cutoff frequency (greater than zero) up toward the high end of the frequency
spectrum. All frequencies above the specified cutoff frequency are allowed to pass,
while all frequencies below are attenuated.
The default cutoff is 100 Hz.
DMP 128 • Software Control 30