Montarbo W18A Owner's Manual download pdf (Page 6)

W18A

bi-amped, active loudspeaker system

ENGLISH

Important !

Product care and maintenance

• Never expose the enclosure to heat sources (heaters or other

products that produce heat).

• Never place burning candles or other sources of open ﬂame on top

of the device.

• Never expose the enclosure to direct sunlight, excessive vibrations

or mechanical shocks.

• Avoid operating and storing the enclosure in damp or dusty places:

this may lead to malfunctions and premature degrading of speciﬁcations.

• Avoid using the enclosure 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 enclosure. In public event don't let people, musicians,

technicians or anyone put glasses, cups, ashtrays or cigarettes on the

enclosure.

• Always leave the protective grid mounted on the enclosure.

• Use a soft brush or a jet of air to clean the enclosure.

Do not use alcohol, solvents or detergents.

• Take care of your connector cables. Make sure that they are not

damaged, knotted or twisted.

• Do not force connectors and controls.

• Make sure the mains power switch is off ('0') before starting any

connection.

• 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.

Mains power connection

• Make sure the mains power switch is off ('0').

• Check that mains voltage corresponds to the voltage indicated

on the panel, under the mains socket.

• 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 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): it is possible

to 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 12.

• Always use only heavy gauge, high quality SHIELDED cables

(signal cables).

• Always make sure that the mixer and the powered enclosures are

switched off before connecting them. This will to avoid annoying noises

and signal peaks, which can also be dangerous for the enclosures

themselves.

Parallel connection of two or more systems

• Always use only heavy gauge, high quality SHIELDED cables (signal

cables). Connect the LINK OUT socket of the ﬁrst system to the LINK IN

socket the second system and the LINK OUT of the second system to

the LINK IN of the third, and so on.

☛ See 'connection examples' at page 13.

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 W18A the input sensitivity is 0dB.

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Montarbo W18A Owner's Manual Page 6

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