X-TREME
user’s guide
4
X-TREME
via
Monti
Urali,
31
-
42029
Reggio
Emilia
(Italy)
•
ph.
+39
-
0522
-
557735
•
fax
+39
-
0522
-
393733
•
e-mail:
[email protected]than traditional systems, this allows a stacked system to project
further. In addition, for geometric reasons a stacked array can
provide more extended vertical coverage than a flown one.
For these reasons, stacking makes sense in small configurations
where only a few elements can optimize audience coverage.
Flying is the best solution to achieve uniform sound pressure
level and even tonal balance over the entire audience provided
that the number of elements arrayed is sufficient to provide the
necessary front to rear coverage. Flying is also an excellent
solution for sightline problems that commonly occur and provides
better high frequency penetration into the audience with reduced
shadowing effects. For flown configurations, additional speakers
are added to cover center or front-fill requirements and to help
pull the localization image down towards the stage for the first
10-20 rows of the audience.
Stacking Guidelines
The designer must know if the audience is standing or seated - the
bottom of the array should always be higher than the ears of the first
rows of the audience and the lowest element tilted downwards.
Note: for extended bandwidth applications, a vertical stack of
two XTDS subwoofers provides a convenient stacking platform
at a height of 2 m above ground level.
If the bottom of the array is too low, the first rows receive too
much SPL and audience members directly in front of the system
behave as an acoustic screen for the following rows (shadowing).
Ideally, the bottom of the array should be slightly above the
audience (not lower than 2 m or 6.5 ft above floor level), with
the lowest element tilted downwards as necessary.
SUBWOOFERS
Subwoofers are used to extend the frequency response of the
XTH - XTL system down to 25-30 Hz and to increase the overall
SPL without increasing the potential for audience hearing loss.
General Guidelines for the use of subwoofers
The number of subwoofers to be used depends on 3 parameters:
1) Number of XTH-XTL elements
The standard number of XTS subwoofers recommended is
a 1:1 ratio.
2) Type of program material
Standard subwoofer ratios are recommended for classical music
or corporate events. For these applications, subwoofers act as
a low frequency extension for XTH-XTL and provide approximately
6 dB of low frequency contour. In this case, the overall system
functions as an extended bandwidth 3- way system.
For more demanding rock music applications, a ratio of 2:1
(XTS) or 1,5:1 (XTDS) is recommended to provide a more suitable
low frequency contour (e.g., 3:2, 6:4, 9:6, 12:8 for XTDS).
3) Type of venue or installation
In open-air, when subs are ground stacked the quantity remains
standard.
AMPLIFICATION
X-Treme Classic Line loudspeakers are designed to be used
with professional power amplifiers capable of producing the
following outputs into 8 ohms:
XTH: 550 W
XTL: 850 W
XTS: 900 W
and into 4 Ohm:
XTDS: 1600 W
XTLT: 460 W
Care should be taken to avoid amplifier clipping. It is important
to understand that a low power amplifier driven into clipping is
more likely to damage a loudspeaker then a higher power
amplifier used within its ratings. This is because music signals
have a high peak-to-average “crest” factor.
When an amplifier is severally overdriven, its output waveform
is clipped (its peak are squared off) – reducing the crest factor.
In extreme cases, the waveform can approach that of a square
wave. An amplifier is normally capable of producing far more
power under these conditions than its undistorted rated power
output. The use of very high power amplifiers with output greater
than those recommended is discouraged.
Care should be taken to avoid switch-on surges, which can
result in momentary power peaks in excess of specified ratings.
When powering up a sound system it is important to switch on
the amplifiers after the mixer and control electronics have
stabilised. When powering down the system, reverse the
sequence and switch off the amplifiers first.
CONNECTIONS
The rear panel of X-Treme loudspeakers are fitted with two
Neutrik Speakon NL4 connectors.
All four pins of both connectors are wired in parallel. The XTH
and XTLT uses the pin assignments 2+/2-. Pins 1+/1- are
designed to XTL, XTS and XTDS subwoofers. Using the male
connector as the input, the female connector allows for direct
connection to additional speakers.
Pins 1+
LF+
(XTL)
(XTS)
(XTDS)
1-
LF-
(XTL)
(XTS)
(XTDS)
2+
HF+
(XTH)
(XTLT)
2-
HF-
(XTH)
(XTLT)
NL4
