X
-TREME
Instructions for use
The
X-ONE
speaker systems can be used both at floor level as
well as suspended. The double subwoofer
XTODS
is available for
the floor installation only, and it can be arranged both horizontally
and vertically.
A homogenous horizontal coverage without any phase interfe-
rence is made possible by choosing a configuration comprised of
XTO
and
XTOS
systems.
Floor stacks are generally arranged by positioning the loud-
speakers directly one on top of the other. In this way a coupling
effect is produced at medium-high frequencies that increases
the vertical directivity and allows an extraordinary coverage, even
over long distances.
By means of a flying system, vertical suspended arrays made of
two or more
XTO
speakers can be created. If
XTOS
systems are
added to the array, a further enhancement at low frequencies will
be achieved.
The high flexibility of the
X-ONE
line allows to create “Sat-Sub”
configurations using either a
XTO
speaker and a
XTOS
subwoo-
fer or two
XTO
speakers and a double subwoofer
XTODS
. By
matching different
X-ONE
speakers, horizontal arrays can be
created in order to extend diffusion to a larger area compared to
that covered by a single element. The cabinet suits perfectly this
purpose. Generally speaking, the
X-ONE
line offers a wide range
of configurations which can be adjusted to any environment invol-
ved in the sound event .
SAFETY INSTRUCTIONS
It is really important to use the speaker systems in compliance
with safety rules.
The professional loudspeakers produce extremely high sound le-
vels and therefore they have to be used with care. Hearing loss is
cumulative and can be a consequence of prolonged exposure to
sound pressure levels higher than 90 dB.. Never stand close to
loudspeakers operating at high volume.
For stacking, ensure that the floor or stage is level and solid. Do
not stack too-high speakers outdoors where winds could topple
the stack.
Flying systems shall only be assembled by trained and skilled per-
sonnel, working in cooperation with professional riggers. All array sy-
stems must be flown to safe and properly load rated rigging points.
STACKED OR FLOWN SYSTEM?
Although flown systems are generally preferred by most sound
engineers, there are good arguments to support both solutions.
In many cases the answer is dictated by logistics that are venue-
specific, i.e., sometimes it isn’t simply possible to fly PA.
Stacking onstage lowers the perceived sound image to stage le-
vel which is beneficial in small venues. Stacking also offers more
low frequency SPL due to enhanced floor coupling. In addition,
for geometric reasons a stacked array can provide more exten-
ded 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 si-
ghtline 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 lo-
calization 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 shall 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
XTOS
subwoofers provides a convenient stacking platform at a
height of 1,05 m above ground level.
If the bottom of the array (composed of
XTO
loudspeakers)
is too low, the first rows could receive a too-high level of SPL
and audience members directly in front of the system behave
as an acoustic screen for the following rows (shadowing).
Ideally, the loudspeakers of the lower row of the array should be
positioned slightly above the audience (in any case 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
XTO
system down to 40 Hz and to increase the overall SPL
without worsening the potential audience hearing loss.
General Guidelines for the Use of Subwoofers
The number of subwoofers to be used depends on 3 parameters:
1) Number of
XTO
Elements
The standard number of
XTOS
subwoofers recommended is a
1:1
ratio and for
XTODS
subwoofers is a
1:2
ratio
2) Type of program being reproduced.
Standard subwoofer ratios are recommended for classical music
or corporate events. For these applications, subwoofers act as
a low frequency extension for
XTO
and provide approximately
6 dB of low frequency contour. In this case, the overall system will
function as a 3-way extended bandwidth in bi-or tri-amplification.
For more demanding rock music applications, a ratio of
2:1
(
XTOS
) is recommended to provide a more suitable low frequen-
cy contour (e.g., 4:2, 8:4, 16:8).
3) Type of Venue or Installation
The number of subwoofers is standard when installed ground-
stacked in open-air places.
x-one
u s e r ’ s m a n u a l
via Monti Urali, 31 - 42029 Reggio Emilia (Italia) • tel. +39 - 0522 - 557735 • fax. +39 - 0522 - 393733 • e-mail: [email protected]