USL JSD-60 Manual - Manual (Page 32)

Page 32
Crossovers
The Crossover Tab is used to configure crossovers and other outputs where a single channel drives multiple band
outputs (see section 4.2 for block diagrams showing crossovers and other outputs). In this view there is response
curve plot that is used to provide feedback for the crossover settings. The actual response can be viewed by
selecting the RTA view.
Along the top of the Crossover Tab display are buttons that select which channel the current display applies to.
Note that all channels are listed, including those where no crossover controls are available. If a channel without
crossover controls is selected, the controls will be "grayed out."
The View buttons select a filter frequency response view or an RTA view. You can watch how the controls affect
the filters within the JSD-60 or how they affect the sound in the auditorium. If an external pink noise generator is
to be used with the internal RTA, enable the internal pink noise generator, then disable it. Enabling the internal
pink noise generator configures the internal RTA for proper operation.
The Speaker button opens a file select dialog where you can select a speaker type from the speaker library. This
loads all the crossover settings with values appropriate for that speaker. Once a speaker is selected, you can select
which screen channels to apply these crossover settings to.
The Copy button allows you to copy the crossover settings from one channel to one or more additional channels.
The Zoom slider changes the number of dB per vertical grid line on the graph. This control is only visible when
viewing the filter response, not the RTA.
The filters in each crossover band are described in section 5.2. Note that frequencies are in Hz, gains in dB, and
delays in ms. The filter types are abbreviated as LP for Low Pass filter, HP for High Pass filter, PEQ for Parametric
EQualizer, HEQ for the high frequency Horn shelf EQualizer, and SEQ for the high frequency Screen shelf EQualizer.
The Mute and Invert buttons mute a particular band output or invert the phase. The figure below shows the
"crossover" settings for an LFE output. Depending on the output module type, one or more LFE outputs are
available. Each has a separate parametric equalizer that can be adjusted in the Equalizer tab view. Note that the