Time Alignment - JBL VTX A12 User Manual

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9.4 - TIME ALIGNMENT

The VTX A12 presets provide proper system summation with companion VTX subwoofers under physically coupled

configurations (stacked or suspended) and when used with corresponding G28 and S28 presets. This pre-alignment

is done at the factory, allowing any VTX subwoofer to be used with any VTX loudspeaker without needing specific sub-

woofer presets for each system and configuration. When the VTX A12 is operated in full range mode with companion

subwoofers, some additional delay should be applied to the subwoofers to match the A12.

VTX

Additional time alignment delay should be added, as necessary, to account for physical path length differences between

suspended A12 arrays and ground-stacked G28 or S28 subwoofers. If no acoustic measurement system is available,

delay values can be calculated based on the geometric path difference between a reference point (i.e. FOH position)

and each system. This is an effective method since all VTX presets include a factory pre-delay to correctly align all com-

ponents. This method is not effective and should not be used when the latency of a system is unknown, such as when

different parts of the system follow a different signal path that might affect latency.

A12

VTX A12 | User Manual

VTX

S28

dSub

VTX

G28

Path Difference

dFlown Array

Path Difference (meters)

Sub Delay =

343 (meters / second)

Path Difference (feet)

Sub Delay =

1140 (feet / second)

dSub

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