X
-TREME
Amplification
X-ONE
loudspeakers are designed to be used with professional
amplifiers able to produce the following outputs:
XTO
Mid-Hi: 600 W (@ 8 Ohm)
XTOS
Low: 1000 W (@ 4 Ohm)
XTODS
Low: 2000 W (@4 Ohm)
Care should be taken to avoid amplifiers clipping. It is important
to understand that a low power amplifier driven into clipping is
more likely to damage a loudspeaker than a higher power ampli-
fier 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 peaks are squared
off) - reducing the crest factor. In extreme cases, the waveform
can approach that of a square wave. An amplifier is normally able
to produce far more power under these conditions than its undi-
storted 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 am-
plifiers only after the feeding and stabilising of the mixer and the
control electronics. For the system powering down reverse the
sequence by switching off the power amplifiers first.
Connectors
The rear panel of
XTO
,
XTOS
and
XTODS
loudspeakers are fit-
ted with two Neutrik Speakon NL4 connectors.
All four pins of each connector are wired in parallel. The
XTO
uses
the poles 2+/2- for mid-hi section in double amplification. The
1+/1- poles are designed for woofer in biamp. or for the full range
system with passive filter, and for
XTOS
subwoofer and
XTODS
double subwoofers. Using the male connector as input, the fema-
le connector allows a direct connection to additional speakers.
Pins
1+
1-
2+
2-
NL4
LF+
(XTO
LF biamp)
(XTO
full range)
(XTOS)
(XTOSDS)
LF-
(XTO
LF biamp)
(XTO
full range)
(XTOS)
(XTOSDS)
HF+
(XTO
HF biamp)
HF-
(XTO
HF biamp)
Cable lengths
When connecting loudspeakers to an amplifier, it is recommended
that the return resistance of the cable used is lower than one tenth of
the nominal impedance of the loudspeaker or systems in parallel.
The table below gives an indication of the maximum admissible
cable run for various cross-sectional conductors
Maximum Cable Run
Conductor CSA
4 ohm
8 ohm
1.0 mm
2
11 m
22 m
1.5 mm
2
17 m
34 m
2.0 mm
2
22 m
44 m
2.5 mm
2
29 m
58 m
4.0 mm
2
44 m
88 m
6.0 mm
2
66 m
132 m
SYSTEM CONFIGURATIONS
X-ONE
loudspeakers can be used with analogue controllers whi-
ch performs system specific equalization, crossover and limiter
functions. More complex set-ups will benefit from the use of XT
amplifiers provided with a digital DSP.
X-ONE
systems can also
be used with
XT266
Digital Speaker Management system and
any other professional digital controllers.
It is important that the controller has fast attack limiters in order to
prevent amplifiers from clipping.
This requires that the controller’s limiter thresholds is set to match
the sensitivity of the amplifier. A system operating with ampli-
fiers having the power rating suggested and used by experienced
professional sound engineers is sufficiently protected from over-
driving. For further information about limiters threshold setting
please refer to the controller’s user guide.
The nominal horizontal coverage pattern of
XTO
is 60 degrees.
This value is considered to be the optimum one in order to meet
the requirements of both small-and-medium size installations.
The crossover frequency recommended for
XTOS
subwoofer is
lower than 100 Hz.
X-ONE
systems driven by a properly configured controller, pro-
vide an essentially flat on-axis frequency response. Equalizations
to compensate particular acoustic conditions of the environment
can be used if required. If the loudspeakers are arrayed it is pos-
sible to obtain benefits from equalization correction that reduces
the effect of the sum of the mid-low frequencies determined by
the use of many loudspeakers.
4 pins Speakon connector:
1+: Positive (+) woofer, XTO full range, XTOS, XTODS
1-: Negative (-) woofer, XTO full range, XTOS, XTODS
2+: Positive (+) high, XTO high
2-: Negative (-) high, XTO high
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]