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VTX B
15
| User Manual
Example 1: 1:1 horizontal stack
Example 2: 1:1 on-end
As previously discussed, subwoofers do exhibit some front-to-back directivity, resulting in 1 to 3 dB of natural rear rejection. This is taken
into consideration in the factory presets, and is the reason 2:1 is the most effective ratio. A 1:1 ratio supplies less rejection than 2:1 or
3:1, and should be avoided whenever possible. This is true for both ground-stacked and suspended configurations.
1 m (3.3 ft) min
10.2 MINIMUM SPACING
When creating large subwoofer arrays using cardioid blocks of B15 subwoofers, a distance of at least 1 meter (3.3 feet) should be al-
lowed between stacks to maximize rejection directly behind the array.
Summary of Contents for JBL Professional VTX Series
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