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[G.W. Alexander]

My room is 68' deep and 88' wide.

I have calculated my vertical throw using JBL's VRX LAC but am wondering what is the best way to figure out how far apart to hang the two 3 speaker line arrays for the best horizontal coverage and minimum phase cancellation. I understand that the horizontal coverage on these speakers is 100 degrees.

I am a rookie and any input would be greatly appreciated!

The line arrays must be hung 18' from back wall and 16' from floor which sets the array angel at 18 degrees if that helps at all.

Thanks!

G.W. "Dubb" Alexander
The River Church
Panhandle, TX

[Michael Elphinstone]

Have you tried looking at the "array tool" on the JBL pro website?

http://asia.jblpro.com/catalog/general/ProductFamily.aspx?FId=9&MId=3

I've used it a few times. Whilst it's not perfect by any stretch of the imagination, in my experience it gives you a pretty good idea of what to expect. Be careful hanging stuff, especially at that angle. It'll mess with the center of gravity a fair bit.

Cheers,
Michael

[Brad Weber]

I have calculated my vertical throw using JBL's VRX LAC but am wondering what is the best way to figure out how far apart to hang the two 3 speaker line arrays for the best horizontal coverage and minimum phase cancellation. I understand that the horizontal coverage on these speakers is 100 degrees.

It sounds like he already used the "Array Tool", however it only addresses the vertical coverage.
 
The 'best' way to look at it would be via a predictive modeling software like EASE or CATT Acoustic, but whether done that way or with something as simple as looking at the nominal coverage overlaid on a drawing of the space you would want to know information such as not just the overall room dimensions but also the dimensions and locations of the 'stage' and the audience areas.  It would also help to know the room finishes in order to be able to consider what happens with any sound hitting the walls and/or ceiling.
 
In addition, it would help to know if the intent is for 'stereo' or mono reproduction.  I have not looked at it at all but if your room is 68' deep and 88' wide and the arrays have to be 18' into the room (I assume that by "back wall" you mean the wall behind the 'stage' and not 18' from the wall at the back of the room) that would mean you are likely working with a nominal 50'x88' audience area and maybe even a bit less depth than that if there is any room between the arrays and the front of the seating, so getting good coverage of the entire audience area from each array may be challenging.
 
Be sure to look at Pages 18 to 20 of http://www.jblpro.com/BackOffice/ProductAttachments/VRXpassive_UG_081808.pdf, it is highly recommended to have a qualified rigger install the arrays if they will be suspended overhead.

[Mac Kerr]

My room is 68' deep and 88' wide.

I have calculated my vertical throw using JBL's VRX LAC but am wondering what is the best way to figure out how far apart to hang the two 3 speaker line arrays for the best horizontal coverage and minimum phase cancellation. I understand that the horizontal coverage on these speakers is 100 degrees.

I am a rookie and any input would be greatly appreciated!

The line arrays must be hung 18' from back wall and 16' from floor which sets the array angel at 18 degrees if that helps at all.

Thanks!

G.W. "Dubb" Alexander
The River Church
Panhandle, TX

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