Specifications

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GLOSSARY
143
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.
Distributed Echo Cancellation Gentner’s proprietary system for applying
echo cancellation individually to each mic input.
DSP Digital signal processor.
Echo Canceller Reference The signal point which contains an electronic
copy of all signals which will be removed from the signal the mics pick up.
This is always the far-end audio and, optionally, local program material.
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) cable.
Filter A device that passes and blocks audio signals based on user-
definable 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 for matching the delay of two
processing channels with different delays.
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. The gain or loss
Filter, High Shelving Provides boosting or attenuation of frequencies
above a designated frequency. The transition between the spectrum above
and below the designated frequency occurs at a fixed 6dB/octave rate. The
gain or loss above the corner frequency is adjustable to +/- 15dB.
Filter, Low Pass A filter that passes low frequencies while attenuating high
frequencies.
Filter, Low Shelving Provides boosting or attenuation of frequencies
below a designated frequency. The transition between the spectrum above
and below the designated frequency occurs at a fixed 6dB/octave rate. The