JBL VTX B18 - Minimum Space between Cardioid Stacks; Minimum Space from a Wall

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VTX B18 | User Manual
11.2 - MINIMUM SPACE BETWEEN CARDIOID STACKS
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. As a minimum a distance of 1.5 meters (4.9’) between stacks should be allowed.
1.5m (4.9’) min
11.3 - MINIMUM SPACE FROM A WALL
When cardioid subwoofer stacks are placed in front of a solid structures (like a concrete wall or a solid stage), some space should be
allowed behind the array for the cardioid effect to develop. A minimum space of 1.5 meters (4.9’) should be allowed.
1.5m (4.9’) min