System information
X-Array Touring Loudspeaker Systems – Applications Notes – Page 25
HELPFUL HINT: When tuning an X-Array system, the user should adjust the input levels so that in-
stantaneous program peaks occur at –5 to –10 dB on the input-level display. Selecting the “2.45v Power
Amp” configuration from the “Options” menu will typically result in the best signal-to-noise performance.
Excessive digital gain or digital EQ boost should be avoided to minimize any in-process digital clipping.
In-process digital headroom can be monitored by temporarily selecting the “dB from Clip” output display
mode from the “Options” menu. The output-display should be returned to the “dB from Limit” mode for
normal operation.
D.7 Signal-Delay Parameters
The DN8000 has the ability to introduce signal delay in the signal path at two locations – at each full-
range input (prior to the crossover filters) and at each output (after the crossover filters). The most com-
mon use for output delay is to time align all of the loudspeaker components within the same loudspeaker
enclosure. The output delays may also be used to align one enclosure to another, or to align one zone to
another by adding the same amount delay (in addition to that required for component alignment) to each
output for a loudspeaker system. The most common use for input delay is to time align one enclosure to
another or to time align one zone to another. Either method can be used for enclosure or zone alignment
because adding signal delay to the full-range input has the same effect as adding the same amount of
delay to each of the individual outputs.
Signal-Delay Displays with Different Operating System Revisions
The DN8000 functions are controlled by the operating system located in the EPROM chip on the main
circuit board. (The EPROM may be upgraded.) The way that the signal-delay was displayed on the menu
screen was changed when the operating system was updated from revision 1.19 to revision 1.20.
Operating-System Revision 1.19 and Earlier: In these earlier revisions, the minimum-signal-delay dis-
play for both the input or output delays in the DN8000 is 20 microseconds; thus, any signal delays intro-
duced for loudspeaker component, enclosure or zone alignment must be added to that 20 microseconds.
The optimized digital parameters for this operating system revision 1.19 and earlier are shown in Revi-
sion 8.0 of the X-Array™ Touring DN8000 Parameters spreadsheet and Revision 2.0 of the Xw Monitors
DN8000 Parameters spreadsheet.
Operating-System Revision 1.20 and Later: In these later revisions, the time-delay display was
changed without the signal-delay function being changed. The minimum-signal-delay display for the input
delay is 1723 microseconds (indicating the delay required for the signal to pass from input to output
through the DN8000); thus, any signal delays introduced for enclosure or zone alignments must be
added to that 1723 microseconds. The minimum signal-delay display for the output delay is 0 microsec-
onds; thus, the exact alignment signal delays introduced for component, enclosure or zone alignments
may be entered directly. The optimized digital parameters for this operating system revision 1.20 and
later are shown in Revision 9.0 of the X-Array™ Touring DN8000 Parameters spreadsheet and Revision
3.0 of the Xw Monitors DN8000 Parameters spreadsheet.
Loudspeaker-Component Alignment
Each output section of the DN8000 has the ability to introduce signal delay into the path for aligning the
loudspeaker components within the same enclosure. As discussed in the general-signal-processing sec-
tion, signal delay is required to align the components in each frequency band. The specific signal delays
required for component alignment within the X-Array™ loudspeaker enclosures are as follows: For the Xf
loudspeaker system, the HF section must be delayed 1042 microseconds relative to the MB section. For
the Xn loudspeaker system, the HF section must be delayed 1000 microseconds relative to both the MB
and LF sections (with no delay required to align the MB and LF sections). For the Xcn loudspeaker sys-
tem, the HF section must be delayed 1000 microseconds relative to the MB section. These relative signal
delays are indicated in the DN8000 spreadsheets. (The digital-parameter spreadsheets also include out-
put signal delays for alignment of different loudspeaker systems as described in the next section.)