Connection Examples - Montarbo SW 540 Manual De Instrucciones

SW540
Active subwoofer

Connection examples

The very low frequency range reproduced by the subwoofer model
SW540 (38 ÷ 120 Hz) is essentially omnidirectional allowing easy
installation of the enclosure. In most cases the subwoofer can be
placed near to the loudspeaker system, but when space or set up
reason dictate it, the subwoofer can be positioned at some distance
from the speaker system (e.g.: under the stage floor).
You must always consider that the extended low frequency range
increases the risk of acoustic feedback, with undesired 'howls' and
reduced clarity. It is thus essential to place the subwoofer on a rigid
structure, that does not transmit vibrations to the microphones.
Some connection examples, among the most common possible
configurations, are described here below and also illustrated on
pages 36 and 37 of this manual.
Our examples are showing the SW540 subwoofer enclosure in
conjunction with the Montarbo W440A powered speakers used
as 'satellite' enclosures.
Even if this represents an optimum combination, the SW540 can
be added with excellent results to any speaker system.
Example A: one SW540 + two W440A active systems
The complex connections usually required for this configuration
with other systems are made extremely simple with our SW540
thanks to the L/R outputs of the built-in stereo electronic cross-over.
Note: It is advisable to place the subwoofer in the center, between the two
speaker enclosures.
mixer L/R outputs ➟ SW540 L/R inputs
SW540 L/R outputs ➟ inputs of the two W440A
 See connection example A on page 36
• Always use shielded cables.
• Connect the L-R outputs of the mixer to the L-R inputs of the
SW540.
• Connect the L-R outputs of the SW540 to the inputs of the
2 active systems. This set-up allows them to benefit from the
increase in dynamic range provided by the electronic crossover
of the SW540.
• Make sure the cross-over button (1) is pushed.
• The output levels of the active speaker enclosures used as satellites
are not affected by the volume control of the SW540.
First set the speaker system's volume controls to their maximum
position, then adjust them to obtain the desired tonal balance.
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Example B: two SW540 + two W440A active systems
This is the most typical configuration: each subwoofer can drive
one or two self-powered speaker enclosures.
mixer 'L/R' outputs ➟ 'R/
SW540 'R' outputs ➟ inputs of the two W440A
 See connection example B on page 36
• Always use shielded cables.
• Connect the L - R outputs of the mixer to the 'R/
the two SW540 subwoofers.
• Connect the 'R' outputs of the two SW540 to the inputs of the
two active systems.
• Make sure the cross-over button (1) is pushed on each SW540.
• The output levels of the active speaker enclosures used as satellites
are not affected by the volume control of the SW540.
First set the speaker system's volume controls to their maximum
position, then eventually adjust them to obtain the desired tonal
balance.
Example C: one SW540 + two W440A active systems
This is a more complex configuration which enables selective
enhancement of the low-frequencies (for example, only on drums
and keyboards, not on voices or brasses).
Note: It is advisable to place the subwoofer in the center, between the two
speaker enclosures.
mixer 'AUX' output ➟ SW540 'R/
mixer 'L' output ➟ W440A input
mixer 'R' output ➟ W440A input
 See connection example C on page 37
• Always use shielded cables.
• Connect the AUXILIARY output of the mixer to the 'R/mono'
input of the SW540.
• Connect the L and R outputs of the mixer to the two speaker
systems respectively.
• This type of set-up allows to use the subwoofer to extend the
low frequency response of only those instruments that really need
it (e.g. drum machines, bass, keyboards).
These instruments are selected by means of the AUX send controls
on the corresponding channels.
The subwoofer's volume control and the mixer's AUX output level
control adjust only the very low frequencies.
' inputs of two SW540
mono
' inputs of
mono
' input
mono