CASA active subwoofers User Manual
Rear panel layout
Setting up
Position your CASA active subwoofer(s) on a stable surface capable of supporting the load and vibrations from the
cabinet. For maximum sound delivery, position with the back close to a solid wall or in a corner of the room.
Aim the cabinet towards the audience or listeners and not in direct line of sight with any microphones that are connected
to the sound system. This is to avoid feedback (howling or booming caused by the microphone
“
hearing
”
itself amplified).
Also, keep microphone stands away from the subwoofer to avoid vibrations being transferred to the microphones.
If a single CASA active subwoofer is to be used with a stereo pair of active full-range speakers, connect both Left and
Right outputs from the mixer into the Left + Right inputs of the CASA active subwoofer (1).
For maximum efficiency, Connect the Left + Right OUTPUT XLRs (3) to each full range speaker, which removes the
lowest frequencies that are being delivered by the subwoofer, freeing up the power of the full-range top cabinets to
produce upper frequencies more efficiently.
Select 80Hz or 125Hz (8) depending upon the size of cabinet. Larger cabinets can usually produce lower frequencies, so
80Hz would be a good choice for 15
”
top cabinets and maybe 125Hz for 8
”
top cabinets, depending also upon the type of
program material being played through the system. Experimentation is recommended. If an unfiltered, full-range output
is needed, connect the Left + Right LINK XLR outputs (2) to the full-range active speakers or amplifier. Also, use these
outputs to feed to further active sub-woofers if necessary.
If there are Left + Right CASA active subwoofers in the sound system, use either Left or Right inputs and link just this
one side to full-range or top cabinets (either LINK or OUTPUT).
When all signal connections are made, connect the power lead provided (or equivalent) from the mains power supply to
the IEC inlet on the CASA subwoofer (9). Ensure that the mains voltage is as indicated on the rear panel of the CASA
active subwoofer.
Operation
With the MASTER output level control turned fully down (7), switch on power to the CASA subwoofer (4)
Ensure that a signal is playing to the input(s) and gradually increase the MASTER to the required level. The ON LED (6)
stays lit to show that the unit is powered up but the SIGNAL LIMIT LED (6) should only light briefly on the loudest parts
of audio (usually beats of a kick drum or other loud transients). If this LED lights for longer periods, it is advised to
reduce the output level to avoid overload.
Where 2 or more subwoofers are used un the same space, if they are facing each other, the signals can cancel each
other out, in this case, one of the subwoofers would need to be
“
phase-reversed
”
by switching the PHASE button (5) to
the opposite setting to the other subwoofer. This phase switch can also be used to help to mitigate feedback or
“
lost
”
sub
output in a room through experimenting with either setting.
Turn down the MASTER level before powering down the CASA active subwoofer to avoid loud noises and disconnect from
the mains supply if not being used for long periods.
1.
L+R LINE inputs combo Jack/XLR
2.
L+R full range LINE LINK outputs combo Jack/XLR
3.
L+R filtered LINE OUTPUTs combo Jack/XLR
4.
Power on/off switch
5.
Phase switch 0°/180°
6.
SIGNAL LIMIT & ON LEDs
7.
MASTER output level control
8.
Filtered LINE out cutoff frequency switch 80/125Hz
9.
IEC mains inlet & fuse holder
