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INPUTS AND OUTPUTS •
LEVEL CONTROL
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The XAP 800 has 12 inputs consisting of eight mic/line inputs and four line inputs. The unit has
12 line outputs.
All inputs and outputs are actively balanced. Inputs 1-8 have 4kOhms of terminating
impedance while line-level inputs 9-12 provide >20kOhms of termination. Outputs provide a
source impedance of 50 Ohms. All levels are referenced to a 0dBu level.
Input and output level control is executed in the digital domain. As a result, input levels should
never 20dBu. The unit will deliver a maximum output level of +20dBm. The XAP 800
utilizes 24-bit A/Ds and D/As while sampling at a 48kHz rate. This results in a system-wide
dynamic range of 100dB, a pass band from 20Hz to 20kHz, and a SNR >100dB at maximum
input level. All input and output levels can be monitored in real time on the front-panel LCD and
through the RS-232 serial port. The LCD display and RS-232 port provide precise numeric
readouts indicating level. This allows extremely precise level calibration. Additionally, while
monitoring numeric dBu audio levels, input and output gains can be adjusted for optimum
audio performance.
Inputs 1-8
Balanced audio is input at the rear panel Phoenix™ connector. Mic or line level is selected and
phantom power is provided (if required). The XAP 800 then converts this audio from analog to
digital for processing by the DSP engine. Once converted to digital, audio is level controlled.
This function, along with all other input and output controls, can be adjusted via the RS-232
port and/or the control pins on the control/status connector. This provides for real-time audio
volume control, muting, etc. Minimum and maximum levels can also be set to limit the range of
gain to suit audio requirements.
The acoustic echo canceller/speech leveler is the first option in the audio signal flow. Here, you
set the echo cancellation reference, non-linear processing (optional), and meters reflecting
echo cancellation activity. You can also enable the noise canceller and depth of cancellation.
Next, four configurable filters can each be set individually as an all-pass filter, a low-pass filter, a
high-pass filter, a parametric equalizer (PEQ), or notch filter. Each may be activated to equalize
Inputs and Outputs
Input and Output
Level Control
Summary of Contents for XAP 800
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