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There are 2 control knobs on the amplifier.
1: GAIN
Provides attenuation of the input from off to full output. Use appropriate gain structure to ensure the output feeding the subwoofer
doesn’t reach clipping and distortion before maximum desired sound level is achieved. The amplifier has a complement of limiters
and safeties to protect itself and the driver however, if audible distortion occurs, lower the level of the incoming signal.
2: EXO ADJUST
This control adjusts the effective crossover frequency allowing the subwoofer to be used with multiple sizes and styles of top boxes
while minimizing out-of-bandwidth noise and phase shift in the crossover region. Rotating the EXO knob fully counterclockwise
(left) results in an effective crossover frequency of 80Hz. Rotating it fully clockwise (right) results in an effective crossover frequency of
100Hz.
3. CARDIOID SWITCH
Toggle Switch allows selection between NORMAL mode and CARDIOID mode.
With the switch in the NORMAL (up) position, the speaker is in normal operating mode and any number of cabinets can be arrayed
side-by-side facing the same way when they are all in NORMAL mode.
When CARDIOID operation is desired, one or two cabinets must be used in NORMAL mode and at least one cabinet must be placed
in CARDIOID mode and its position reversed relative to the other cabinet(s) The ideal ratio is 2 cabinets in NORMAL with one
CARDIOID cabinet between them vertically or horizontally.
Reduced
NORMAL >>
Audience
Level
<< CARDIOID
Audience
Area
NORMAL >>
Audience
The NORMAL mode cabinet(s) are used with the woofer facing towards the audience. The CARDIOID mode cabinet is rotated with
the woofer away from the audience and the CARDIOID SELECT SWITCH in the CARDIOID (down) position.
The cabinet in CARDIOID mode should have the EXO knob at the lowest level, rotated fully counterclockwise. The EXO setting on the
NORMAL mode cabinet(s) can be set to taste but all cabinets in NORMAL mode should be set the same.
Note:
When the speaker is in CARDIOID mode, the green PWR LED is disabled because it will be facing the audience. The speaker
will still power up and play.
When only two cabinets are used, the cabinet in CARDIOID mode can be placed on top of the cabinet in NORMAL mode.
The cabinet in CARDIOID mode can also be placed adjacent to the NORMAL mode cabinet, with the NORMAL mode cabinets placed
farther from the stage or area where reduced level is desired. When only 2 cabinets are in use, the CARDIOID mode cabinet GAIN
should be reduced by 3dB. The greatest level reduction occurs on axis with a line drawn from the center of the NORMAL cabinet’s
baffle, through the center of the CARDIOID cabinet’s baffle.
Reduced
<< CARDIOID (-3dB)
Audience
Level
NORMAL >>
Audience
Area
Audience
Operation and Controls:
Three-dimensional
representation of cardioid
output pattern.