Troubleshooting guide

Modular Processors
SHURE
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P4800 System Processor Software Guide Page 50 of 108
Note: Using a 12dB/oct filter type in adjacent bands will create a notch at the crossover
frequency if the outputs are summed. When aligning loudspeakers, take care
that the acoustic response does not display this notch. If necessary, use the
polarity button to invert the polarity of one of the bands.
Upper Corner Freq
This indicates the frequency setting of the upper corner of the pass band. The range of
values available depends on the setting of the lower corner frequency, as corner
frequencies cannot overlap. You can change the value by clicking on the spin buttons, using the
keyboard controls, or typing in a specific value. The default values for the various pass bands are
listed below for each type of crossover.
Xover Type 2-way 3-way 4-way 5-way
Band 1 2.0 kHz 200 Hz 150 Hz 60 Hz
Band 2 OUT 2.0 kHz 1.5 kHz 150 Hz
Band 3
−
OUT 5.0 kHz 1.0 kHz
Band 4
− −
OUT 6.0 kHz
Band 5
− − −
OUT
Gain
This indicates the current gain setting of the pass band filter. The range of available gain values is
between –18dB and +12dB in 0.5dB increments, with a default setting of 0dB. You can change the
value using the conventions described in the Faders section on page 31.
Keyboard Controls
You can use keyboard controls to make fine adjustments to the handle positions in the response
plotter. Click to select a handle, then use the following shortcuts.
Keystroke
Crossover and
Corner Handles
Gain Handle
←
Decreases frequency
by one screen pixel
−
→
Increases frequency
by one screen pixel
−
↑
−
Increases gain
by 0.5 dB
↓
−
Decreases gain
by 0.5 dB
SHIFT with ←
Decreases frequency
by 1/3 octave
−
SHIFT with →
Increases frequency
by 1/3 octave
−
SHIFT with ↑
or PAGE UP
−
Increases gain
by 3 dB
SHIFT with ↓
or PAGE DOWN
−
Decreases gain
by 3 dB
SPACEBAR
or right mouse click
−
Sets gain to 0 dB
Note: Nudging the frequency by one screen pixel changes the value by approximately
1/100 of an octave, or 1%.