Minimum Space Between Cardioid Stacks; Minimum Space From A Wall - JBL VTX Series User Manual

VTX B18 | User Manual
11.2 MINIMUM SPACE BETWEEN CARDIOID ST ACKS
When creating large subwoofer arrays using cardioid blocks of B18 subwoofers, some space should be allowed between the stacks to
maximize rejection directly behind the array. Allow a minimum distance of 1.5 meters (4.9 feet) between stacks.
11.3 MINIMUM SPACE FROM A W ALL
When cardioid subwoofer stacks are placed in front of a solid structure like a concrete wall or solid stage, a minimum of 1.5 meters (4.9
ft) should be provided behind the array to allow the cardioid effect to develop.
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