System information
X-Array Touring Loudspeaker Systems – Applications Notes – Page 23
meters for "dB from Limit," the meter peak hold for "Auto Clear," and the maximum output voltage for
"2.45v: Power Amps."
HELPFUL HINT: When setting up an X-Array system, the DN8000 global options settings should be
programmed as indicated above. If a higher output-voltage drive is required, the "9.75v: Line Level" may
be used. The user is cautioned that, when the output-voltage drive is changed, the compressor and limi-
ter thresholds are automatically changed in addition. Thus, the user must manually reset all of the com-
pressor and limiter threshold on each of the outputs whenever a drive-voltage change is made.
D.4 Equalization Parameters
The DN8000 equalization is used for two purposes – to achieve a nominally flat frequency response for a
single loudspeaker system, and to compensate for acoustic interaction between multiple systems and the
acoustic environment. Each output section has four equalization filters that have been set up as paramet-
ric filters with their center frequencies distributed across the operating frequency range of that output.
Those parametric filters can then be thought of as a four-band graphic equalizer covering the frequency
range of each output section. The center frequencies and bandwidths of the filters have been chosen
based on the EQ requirements of the individual loudspeaker systems, plus typical array-interaction and
room-build-up characteristics. The DN8000 equalization settings shown in the included tables provide a
nominally flat frequency response for a single system. Adjustments for acoustic interaction may often be
accomplished by simply adjusting the level (boost or cut) of each parametric filter. When finer tuning is
required, the center frequencies and bandwidths may be adjusted.
HELPFUL HINT: When tuning an X-Array system, the user should first adjust output levels of each
band, then adjust the equalization-filter levels to deal with problem frequencies. This typically requires
reducing some of the PEQ levels (usually in the mid-bass section and lower high-frequency section) to
compensate for acoustic buildup due to array coupling, room buildup, or feedback. If necessary, the PEQ
center frequencies and/or bandwidths (Q) may then be adjusted as necessary for further fine tuning.
D.5 High- & Low-Pass-Filter Parameters
As discussed in the general processing section, the 80-Hz SUB/LF crossover frequency, the 125-Hz
LF/MB crossover frequency and the 1,760-Hz MB/HF crossover frequency (all with Linkwitz-Riley 24-dB-
per-octave slopes) were selected for maximum performance of the X-Array loudspeaker systems and
should not be changed. The HF-section ultrasonic filters (16.0k-Hz low-pass filters for the Xf, Xn and Xcn
HF sections) may be adjusted as needed.
HELPFUL HINT: When tuning an X-Array system, the SUB/LF, LF/MB and MB/HF crossover filters
should not be changed, nor should the SUB and LF subsonic-high-pass filters. The ultrasonic-low-pass
filters in the HF sections may be adjusted as necessary. If there is excessive HF-amplifier clipping, or if
the HF transients lack detail (potentially from excessive high-frequency boost or excessive ultrasonic en-
ergy in the program material), decreasing the ultrasonic-low-pass-filter frequency or increasing the slope
may reduce the amplifier clipping and/or clean up the sound.
D.6 Gain Parameters
Input-Level Adjustments
The input-level knobs of the DN8000 are digitally controlled analog (pre A/D) and should be adjusted as
necessary for a good match to the console and/or outboard drive electronics. Note from the digital-
parameter spreadsheets that the starting point for the input-level knobs is the center-detent (0-dB-gain)
position. The user should further note that the input-level display on the front panel of the DN8000 has a
fixed referenced of dB from clipping (in other words, full-scale 0 dB is the point where the A/D converters
clip).