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Other Cardioid Configurations
It may be beneficial for the user to employ variants on the standard cardioid configurations in the
form of unequal front/rear-facing subwoofers and/or relative front/back subwoofer gain
adjustments. This allows the user to further tailor output and rejection levels to suit the needs of
their application.
Three RL18S
– In situations where space permits three RL18S to be assembled in one array, a
cardioid configuration is still possible. Because the amount of forward- and rear-facing enclosures
are no longer even, however, a gain offset must be applied to the rear facing subwoofer to
maintain the same nominal rejection level as with the two-subwoofer configurations.
Maximum Rejection
– The included cardioid presets are tailored to provide the optimal balance of
rejection and forward output. In this way, an array of two RL18S subwoofers can provide significant
rear rejection while sacrificing only 1.5 dB of forward gain as compared to two RL18S in an
omnidirectional configuration (both facing forward, on the default preset). The included preset is
also optimized to provide rejection at distances of approximately 10 feet from the stack.
However, the user may desire greater amounts of rejection at distances closer to the array, at the
expense of forward output. This can be easily accomplished by simply reducing the amount of gain
on the rear-facing subwoofer as follows:
Rear Attenuation*
Rejection Distance
Forward Reduction
Rear Gain Setting
12 – 18 dB
10 ft/ 3 m
-1.5 dB
0 dB (unity)
1 ft / .3m
-6 dB
-6 dB (first line below 0)
* Rear rejection measurement at “Rejection Distance”, averaged across operating range. Rear
attenuation is heavily dependent upon acoustical environment and exact results may vary.
Rigging
Redline RL12 and RL15 are intended to be suspended via integral rigging
points, or ground-stacked. Redline RL18S is intended to be ground-
stacked only. It is the user’s responsibility to determine the viability and
safety for alternate methods and implement them accordingly.
NOTE: At a minimum, any suspended Redline loudspeaker must be flown
from the two top M8 rigging points. The third point on the rear of the
enclosure may be used to increase the down-tilt. Always observe load
de-rating when applying loads with lateral components to eyebolts. Use
hoist rings where necessary.
NEVER SUSPEND ONE REDLINE ENCLOSURE
FROM ANOTHER – ALL FLOWN REDLINE ENCLOSURES MUST BE
SUPPORTED INDEPENDENTLY.
