X-Treme Audio XTDP - Manual (Page 8)

XTDP CONTROLLERS
High and Low Pass Filters
• Knob A: Cut off frequency, <<out, 20.0 Hz - 25.6 kHz, out>>
• Knob B: High pass or low pass filter type
Filter type is selectable from Butterworth, Bessel, Linkwitz-Riley
and Hardman. Filter slopes of up to 8th order or 48 dB/octave are
provided. Not all filter types are available in all slopes. For example
18 dB/octave Linkwitz-Riley filters do not exist.
The Hardman type filter is always described by its order as the filter
becomes progressively steeper rather than following a linear slope
so a dB/octave description is not accurate.
Parametric Equalisation
Eight sections of equalisation are provided in a similar format to the
input channel equalisation; two shelving filters and six parametric.
• Knob A: Frequency, from 10 Hz to 25.6 kHz, in variable steps
• Knob B: Slope, from 6 to 12 dB/octave, in 1 dB steps
• Knob C: Gain, +/-15 dB, in 0.2 dB steps
The frequency is specified as point where the filter deviates by 3 dB
from the gain value.
• Knob A: Centre Frequency, 10.0 Hz - 25.6 kHz, in variable steps
• Knob B: Width, display selectable: Q or BW (Bandwidth).
BW adjustable from 0.1 to 5 octaves, in variable steps and Q
adjustable from 14.2 to 0.2, in variable steps
• Knob C: Gain, +/-15 dB in 0.2 dB steps
Limiters
• Knob A: Threshold, from -40 dBu to 20 dBu, in 0.2 dB steps
A high performance, low distortion limiter is provided on each out-
put. Threshold is user adjustable; all other parameters are carefully
calculated dependant on configuration to provide clean and effec-
tive control of signal dynamics.
Routing
• Knob A: Output source, selectable: Input A, Input B or Sum A+B
Configures the routing from input to output. This function is only
available in mono format presets.
8. Utilities
Utility functions
Three utility functions are provided to adjust screen contrast, the
display units used for parametric equalization bandwidth and
switch between stereo and mono mode. The device automatically
adjusts for the variations in display contrast as the temperature
of the LCD changes. The screen contrast utility control sets the
base contrast of the screen and also allows optimization for a given
viewing angle. Parametric equalization width parameters can be
displayed in either ‘Q’ or bandwidth, expressed in octaves.
Care should be taken when swapping between Mono and Stereo
mode as the parameter set for the left hand channels will be copied
to the right hand side, overwriting those settings. This is not revers-
ible and could represent quite a significant and potentially damag-
ing change to the processing.
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