Time Alignment - JBL VTX Series User Manual

10.4 - TIME ALIGNMENT

The VTX A8 presets provide proper system summation with companion VTX subwoofers (all models) under physically coupled config-
urations (stacked or suspended) and when used with corresponding B18, G28, S28 and S25 presets. This pre-alignment is done at the
factory, allowing any VTX subwoofer to be used with any VTX loudspeaker without needing specific subwoofer presets for each system
and configuration.
VTX A8
Additional time alignment delay should be added, as necessary, to account for physical path length differences between suspended
A8 arrays and ground-stacked VTX 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 components. 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.
VTX B18 VTX S28
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VTX A8 | User Manual
VTX G28
Path Difference
Sub Delay =
Sub Delay =
dSub
=
dFlown Array - dSub
Path Difference (meters)
343 (meters / second)
or
Path Difference (feet)
1140 (feet / second)