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APPENDICES •
GLOSSARY
56
Constant Directivity Horn Equalizer (CD Horn EQ)
Horn drivers commonly
used in arrays in arenas and auditoriums have an inherent 6dB/octave high
frequency rolloff. The XAP 800’s CD Horn EQ compensates for this characteristic.
Crossover
A device that passes designated frequency segments of an audio
signal to various loudspeaker elements in a sound system.
Crossover, Bessel
A crossover using a low-pass filter design characterized by a
linear phase response. This results in a constant time delay throughout the
passband.
Crossover, Butterworth
A crossover using a low-pass filter design characterized
by a maximally flat magnitude response. This results in no amplitude ripple in the
passband.
Crossover, Linkwitz-Riley
A fourth-order crossover consisting of a cascaded
second-order Butterworth low-pass filter. Offers a vast improvement over the
Butterworth crossover and is the de facto standard for professional audio active
crossovers.
Decay Rate (slow, medium, fast)
Programs how quickly the audio level is
attenuated once a channel has been gated off.
DSP
Digital signal processor.
Echo Canceller Reference
The output or Expansion Bus reference the echo
canceller uses to remove echo.
Expansion Bus
Consists of two RJ-45 connectors on the rear panel of the XAP
800. An Expansion Bus allows multiple XAP 800s to be networked together using
category five twisted-pair (10BaseT LAN) cable.
Filter
A device that passes and blocks audio signals based on requirements of the
system.
Filter, All Pass
A filter that provides only phase shift or phase delay without
appreciably changing the magnitude characteristic. The filter produces a flat
amplitude response. It is useful in custom crossover applications to compensate for
speaker driver deficiencies.
Filter Display
A group of nodes plotted on a logarithmic scale. The XAP 800’s
filter display can be accessed through the Inputs 1-8, From Processing, or To
Processing windows.
Filter, High Pass
A filter that passes high signal frequencies while attenuating low
frequencies.
Summary of Contents for XAP 800
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