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[Luke Geis]

^^^^^^ Yes very true and I should have clarified that it was 360* behind at a specific frequency. The point being that forward coupling is bad and diminishes quality. The only reason this may work at all is that there is a 2:1 ratio of forward facing to rear facing subs ( in most cases ). Because the forward facing subs have perhaps more than double the potential forward energy, the rear-facing subs forward energy is not as potentially destructive.

[Noah D Mitchell]

Thanks for all the helpful information - some informative reading.


Now I'm curious about an end-fire array that is hung in the air. I am building a three element array hung by chain rigging systems designed by APE systems.


1: Would a heavy sub (TH118XL) be prone to sway at all from the force of program material? I'm thinking no because the signal oscillates.
  -Also from HVAC - there is no direct airflow in the vicinity of the array, and even if so, that's a decent amount of mass to move.


2: If something did cause the elements to swing, how quickly/drastically would the array effect break down?
  -Then related: If program material caused a swing, they should actually all be affected the same and swing together.

[Tim McCulloch]

Thanks for all the helpful information - some informative reading.


Now I'm curious about an end-fire array that is hung in the air. I am building a three element array hung by chain rigging systems designed by APE systems.


1: Would a heavy sub (TH118XL) be prone to sway at all from the force of program material? I'm thinking no because the signal oscillates.
  -Also from HVAC - there is no direct airflow in the vicinity of the array, and even if so, that's a decent amount of mass to move.


2: If something did cause the elements to swing, how quickly/drastically would the array effect break down?
  -Then related: If program material caused a swing, they should actually all be affected the same and swing together.

No worries.

For more fun with subwoofers:  http://www.jblpro.com/ProductAttachments/PD_LF_TechNote.pdf

[Noah D Mitchell]

No worries.

For more fun with subwoofers:  http://www.jblpro.com/ProductAttachments/PD_LF_TechNote.pdf

Great article!

[Doug Fowler]

For 50 Hz cancellation in a two deep endfire (IIRC) it's 5 feet sub front to sub front, 5.5 msec of delay. Done this many times with Danley BC-415 with good effect. 

[ProSoundWeb Community]