active subwoofer
218SA
Connections
The very low frequency range reproduced by model 218SA
(31
÷
100Hz) is essentially omnidirectional allowing easy
installation of the enclosure.
In most cases the subwoofer can be placed near the speaker
systems, but when space or set up reason dictate it, the
subwoofer can be positioned at some distance from them
(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 (although the ideal conditions
for use still require the subwoofers to be resting on the floor
'half space').
Some connection examples, among the most common
possible configurations, are described here below and also
illustrated on pages 17, 18 and 19
of this manual.
Our examples are showing the 218SA subwoofer enclosure
in conjunction with the Montarbo powered speaker W20A
used as 'satellite' enclosure. However this represents a good
combination the 218SA can be added with excellent results
to any speaker system.
See fig.
1
page
17
One 218SA + two active speaker enclosures W20A
The complex connections usually required for this configu-
ration with other systems are made extremely simple with
our 218SA 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
➟
L
-
R
inputs of one
218SA
L
-
R/
X
-
OVER
outputs of one
218SA
➟
inputs of two
W20A active systems.
See fig.
2
page
18
Two 218SA + two active speaker enclosure W20A
This is the most typical configuration: each subwoofer can
drive one or two self-powered speaker enclosure.
mixer
L
-
R
outputs
➟
R/
MONO
inputs of the two
218SA
R/
X
-
OVER
outputs of the two
218SA
➟
inputs of the
active systems W20A
See fig.
3
page
19
Parallel connection
Two or more 218SA
The 218SA speaker system is equipped with XLR male (Link)
and female (input) sockets wired in parallel, allowing for
easier parallel connection of more systems.
mixer
L
-
R
outputs
➟
218SA R/
MONO
inputs
LINK
output of the
218SA
➟
R/
MONO
input of another
218SA
!
Always use SHIELDED CABLES
!
Make sure the 'Flat/X-over' switch (1) is pushed (X-OVER
mode).
!
Connect the L - R outputs of the mixer to the 'R/
MONO
'
inputs of the two 218SA subwoofers.
!
Connect the R outputs of the two 218SA to the inputs of
the two satellite systems.
!
The subwoofer level control adjusts also the satellite
system's volumes. First set the speaker system's volume
controls to their maximum position, then eventually adjust
them to obtain the desired tonal balance.
!
Always use SHIELDED CABLES
!
Make sure the 'Flat/X-Over' (1) switch is pushed (X-OVER
mode).
!
Connect the L-R outputs of the mixer to the L-R inputs of
the 218SA.
!
Connect the L-R outputs of the 218SA to the inputs of
the 2 'satellite' active systems. This set-up allows them to
benefit from the increase in dynamic range provided by the
electronic crossover of the subwoofer
!
The subwoofer's level control adjusts also the speaker
system's level. First set the speaker system's volume controls
to their maximum position, then adjust them to obtain the
required tonal balance.
11
ENGLISH
