SW540
Active subwoofer
14
ENGLISH
Important !
Product care and maintenance
•
Always keep air vents unobstructed so air can circulate freely.
Otherwise, electronic components may overheat and suffer damages.
To ensure proper ventilation, place the subwoofer a sufficient distance
away from walls and make sure it isn’t covered
by curtains and similar. This is vital to keep the power amp cool.
•
Never expose the enclosures to direct sunlight, excessive vibrations
or mechanical shocks.
•
Never place burning candles or other sources of open flame on top
of the device. Do not expose the enclosures to heat sources (lamps,
lights, high power light sources, radiators or other products that
produce heat).
•
Avoid operating and storing the system in damp or dusty places:
this may lead to malfunctions and premature degrading of
specifications.
•
Avoid using the system close to strong sources of electromagnetic
interferences (e.g. video monitors, high power electrical cabling).
This may lead to degradation of audio quality.
•
When setting up the system up outdoors, be sure to protect it
against rain.
•
Care should be taken so that objects do not fall and liquid is not
spilled onto the enclosures. In public event don't let people, musicians,
technicians or anyone put glasses, cups, ashtrays or cigarettes on the
enclosures.
• As satellite supporting pole we recommend the Montarbo SM4.
•
Always leave the protective grid mounted on the enclosures.
•
Use a soft brush or a jet of air to clean the enclosure.
Do not use alcohol, solvents or detergents.
•
Take care of the connecting cables.
Make sure that they are not damaged, knotted or twisted.
•
Do not force connectors and controls.
•
As long as it is plugged in there can be dangerous electrical potentials
inside the device, so, before undertaking any sort of maintenance work
etc., always make sure it has been unplugged from the mains socket.
Power supply connection
•
Make sure the mains power switch is off ('0') before starting any
connection.
•
Check that mains voltage corresponds to the voltage indicated on
the panel.
•
Use only the factory supplied mains cable or, if a different plug style
is needed, a suitable cable with a ground connection and marked with
the safety approvals valid in the country of use.
•
Leave enough room to get to the mains power socket and the mains
connector on the back panel.
As long as it is plugged in there can be dangerous electrical potentials
inside the device, even when the mains switch is in the '0' (off) position
and the power indicator is off so, before undertaking any sort of
maintenance work etc., always make sure it has been unplugged from
the mains socket.
Connection to the mixer
If the mixer has XLR balanced outputs:
use standard balanced XLR
connectors.
If the mixer has XLR unbalanced outputs:
in this case, unless you are
using a Montarbo mixer, make sure that the XLR outputs on the mixer
are unbalanced to IEC 268 standard: 1 = GND, 2 = HOT, 3 = GND.
If the mixer has JACK balanced outputs (stereo jacks):
use stereo
jack-XLR adapters, wired according to IEC 268:
pin 1 = ground (sleeve), pin 2 = tip, pin 3 = ring.
If the mixer has JACK unbalanced outputs (mono jacks):
use suitable Jack-XLR male adapters unbalanced according to IEC 268:
pin 1 = ground, pin 2 = tip, pin 3 = ground
See 'connectors' at page
35
.
•
Always use only heavy gauge, high quality
SHIELDED cables
(signal
cables).
•
Always make sure that the mixer, the SW540 and any other powered
enclosure are switched
off
before connecting them.
This shall to avoid annoying noises and signal peaks, which can also be
dangerous for the enclosures themselves.
Input sensitivity and clipping. How to avoid clipping
Every amplified speaker system is characterized by a value of input
sensitivity. The sensitivity is defined as the value of the amplifier's input
signal that will result in maximum power output. An increase in input
signal over that threshold will result, not in increased power, but in a
distortion phenomenon called 'clipping' (output stage saturation).
In this condition, the speaker will operate improperly. The diaphragm
will exceed it's excursion limits, and the voice coil will overheat beyond
it's thermal limits, resulting in overheating and premature failure.
The active processors will help in avoiding clipping, by reducing the
amplifier gain and thus the input sensitivity, but this type of protections
may be overridden in very extreme conditions.
What the active processor cannot modify is a signal that is distorted
before getting to the active speaker's input.
The effects of this type of signal are the same as described above.
How to avoid clipping
The simplest way to avoid clipping is to check each level in the signal's
chain. Start from each input channel of the mixer and adjust the gain
control and the equalizer's controls so that the PFL meter will never (or
only occasionally) indicate more than 0dB. In simpler mixers, check that
the 'clip' or 'peak' indicator is always off, or blinks only occasionally.
If these levels are exceeded, reduce the channel's input gain.
Once the desired mix is obtained, adjust the output level so that it never
exceeds the active speaker's or the power amplifier's input sensitivity,
as displayed on the master output VU-meter.
In model SW540 the input sensitivity is 0dB.
Summary of Contents for SW 540
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