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Interesting topic, my 2 cents:

1. Time differences between mains and the sub aux don’t matter as long as they stay the same. Time align subs and mains and you’re done.

2. Changing fader levels are changing the acoustical crossover point, as are send levels. Time alignment should be done in a way that works over a wide frequency range to account for the crossover point shift.

3. Different EQ changes acoustical crossover point and phase.

Conclusion: Be very sure shat you do when doing subs on aux. When I’m doing system I do it for BEs that like to have the system this way, when I’m mixing I tend to just go for a complete system.

Christian Tepfer
Hamburg, Germany