System information

X-Array Touring Loudspeaker Systems – Applications Notes – Page 20
C. LF & SUB POLARITY WIRING
The X-Array™ 18-inch woofers were wired with inverted polarity in the enclosures to match the same
inverted wiring of the 18-inch woofers in the Electro-Voice MTL (Manifold Technology) concert-sound
loudspeaker systems because it was thought that MTL loudspeaker enclosures might occasionally be
mixed with X-Array™ loudspeaker enclosures.
The inverted wiring of the MTL systems resulted in superior acoustic summation with the mid-bass sec-
tions of the MTH when used with available analog crossovers at the time of the 1985 product introduc-
tion. In the analog-delay circuits, the signal delay varied with frequency and, resulting in improved acous-
tic summation with inverted woofer polarities.
In digital crossovers (which did not become widely available until sometime after the MTL/MTH introduc-
tion), the signal delay is constant with frequency and superior acoustic summation results between the
mid-bass- and low-frequency sections with normal polarity. Once digital crossovers became available,
the electronic polarity in the digital crossovers was inverted to bring the MTL woofers back into normal
overall polarity. (When the polarity is inverted in the enclosure and then inverted again in the digital
crossover, normal polarity results.)
In retrospect, a better choice would have been to invert the MTL woofer polarity in the analog electronic
crossover instead of in the loudspeaker enclosure wiring. However, with thousands of MTL loudspeaker
systems already in the field with the inverted wiring, it would be problematic to change the wiring con-
vention. Thus, the X-Array™ low-frequency and subwoofer sections were wired with the same inverted
polarity.
D. KT DN8000 DIGITAL SIGNAL PROCESSING
All of the general signal-processing notes presented in the main body of these applications notes applies
to all digital controllers that may be used with the X-Array™ loudspeaker systems, including the Klark
Teknik DN8000. This appendix presents additional signal-processing notes specific to the DN8000. Top-
ics that are covered in detail in the general signal-processing section may only be briefly mentioned in
this appendix. In those cases, the reader will be referred to the general signal-processing section earlier
in these application notes for more details.
D.1 Loudspeaker-System Setups
Digital-processing parameters have been developed for the DN8000 for use with the X-Array loud-
speaker systems. Spreadsheets are included with these application notes with the parameters for the
following several typical X-Array system configurations. Many of these configurations are included as
factory presets within the DN8000. The user should note that Electro-Voice may update those presets
without notice based on input from actual users. The latest revision of the X-Array™ Touring DN8000
Parameters spreadsheet and the Xw Monitors DN8000 Parameters spreadsheet may be found on the
Electro-Voice website (electrovoice.com).
Xb, Xf & Xf - Mono: This program should be used with the Xb and Xf loudspeaker systems for mono,
long-throw applications where multiple coverage zones are employed (two per DN8000). Typical applica-
tions would include large front-of-house systems. Xcb systems may be substituted for the Xb systems.
This program is included as a DN8000 factory preset.
Xb, Xf & Xf - Stereo: This program should be used with the Xb and Xf loudspeaker systems for stereo,
long-throw applications. Typical applications would include front-of-house systems and large-stage
monitor side fills. Xcb systems may be substituted for the Xb systems. This program is not included as a
factory preset and must be manually programmed into the DN8000 by the user.