[aceinc]

I'm thinking about building a ~72" line array, (closer to 84" with the base, etc.) most likely open baffle. Contemplating a 2 - way design with NEO style ribbons and smallish (~4") dynamic drivers.

My first question is, "Having the woofer & tweeter side by side with a crossover at about 1kz, will I have much in the way of horizontal cancellation off access?"

Another question is, "Would there be any benefit to having the tweeter array 'flanked' by woofer arrays on either side?" I can see potential problems with both the cancellation issue and probably the woofers overpowering the (sensitivity) the tweeters.

Danny Richie has asymmetrical "wings" on his NX tremes. But I also see many large driver OB designs with no wings. The line array design I envision wouldn't have more than a 9"-10" wide baffle.

Should I use wings? If so is there anything which might help in calculating their design?

[jk@home]

I don't have a line array but...I started with a test baffle with no wings. Built permanent baffles with back angle supports and removable wings. Ended up removing the wings due to imaging issues I didn't have with the test baffles. I didn't use any modelling programs, have a hard enough time with REW.

I would say, in hindsight, build the baffles without, and then experiment with foam boards as temporary wings. Which means you will have to come up with another baffle support design, but it will give you the option to wing it or not.

[Early B.]

Don't "wing it."

There's a video where Danny talks about the benefits of wings and his experience with them. As I recall, there's no formula. It takes a ton of experimentation with prototypes to try various angles and depths and measure each result.

Here it is: https://www.youtube.com/watch?v=7ipMq7KlWwM&t=791s

[Tyson]

One of the  secrets of the GR Research OB speakers is they use NoRez to line the inside of the wing.  This addresses the imaging problem mentioned earlier.

[marcos overload brazil]

I'm thinking about building a ~72" line array, (closer to 84" with the base, etc.) most likely open baffle. Contemplating a 2 - way design with NEO style ribbons and smallish (~4") dynamic drivers.

My first question is, "Having the woofer & tweeter side by side with a crossover at about 1kz, will I have much in the way of horizontal cancellation off access?"

Another question is, "Would there be any benefit to having the tweeter array 'flanked' by woofer arrays on either side?" I can see potential problems with both the cancellation issue and probably the woofers overpowering the (sensitivity) the tweeters.

Danny Richie has asymmetrical "wings" on his NX tremes. But I also see many large driver OB designs with no wings. The line array design I envision wouldn't have more than a 9"-10" wide baffle.

Should I use wings? If so is there anything which might help in calculating their design?

----------------
see here, some ideas already tested in Brazil
drawings available 
https://www.pelegobox.com.br/category/line-array-1?srsltid=AfmBOoqj7dY3bvTsPq2Mpk_BbiL_AojFX-zFEzYAhDFeizk-SqXkmU29

[marcos overload brazil]

I don't have a line array but...I started with a test baffle with no wings. Built permanent baffles with back angle supports and removable wings. Ended up removing the wings due to imaging issues I didn't have with the test baffles. I didn't use any modelling programs, have a hard enough time with REW.

I would say, in hindsight, build the baffles without, and then experiment with foam boards as temporary wings. Which means you will have to come up with another baffle support design, but it will give you the option to wing it or not.

=============================

I find TRUE Rta MORE ACCURATE than REW

https://trueaudio.com/rta_abt1.htm

[FullRangeMan]

Always liked this speaker from Paul Hynes if I remember well.
Eight Visaton B200. No commercial speaker can offer this:
OB
LA
Cross-Overless

[aceinc]

Don't "wing it."

There's a video where Danny talks about the benefits of wings and his experience with them. As I recall, there's no formula. It takes a ton of experimentation with prototypes to try various angles and depths and measure each result.

Here it is: https://www.youtube.com/watch?v=7ipMq7KlWwM&t=791s

What will a 72" x 9" wide open baffle line array with no wings sound like?

It's a lot of work with no way of estimating the outcome. I don't want to build a kit, but I also don't want to start hiking in the desert without know whether there is an oasis out there somewhere.

[S Clark]

If it's open baffle 9" wide, it will be somewhat thin in bass somewhere below 200-300Hz. 
You can add servo subwoofers, or you can add a bass module, or you can make a boxed cabinet line array.   One of the rules of physics is you can't have it all.   

By the way, one of my students designed an OB line array with dual wings on piano hinges waaaaay back in 2006.  We drove ourselves nuts getting a good crossover and decent measurements.  Danny worked on it also for most of a morning improving it and making suggestions (dare we take credit for planting an idea?) 

[aceinc]

If it's open baffle 9" wide, it will be somewhat thin in bass somewhere below 200-300Hz. 
You can add servo subwoofers, or you can add a bass module, or you can make a boxed cabinet line array.   One of the rules of physics is you can't have it all.   

By the way, one of my students designed an OB line array with dual wings on piano hinges waaaaay back in 2006.  We drove ourselves nuts getting a good crossover and decent measurements.  Danny worked on it also for most of a morning improving it and making suggestions (dare we take credit for planting an idea?)

Yeah the ol' "cheap, good or fast, you can have any two."

Perhaps a partial box, either on the bottom woofers, or a few woofers on both the top & bottom. If there ar 16 x 4" woofers, perhaps between 6-12 enclosed.

[ThePriest]

Aceinc, when I developed and designed my linesources, I went through many of the same questions and dilemmas.
In short I realised that a two-way narrow baffle OB line source is not feasible if you want bass. Not at all.
After trying to cut corners with cheaper options, I ordered a set of dual 12" OB woofers and amps from GR-Research, which I later upgraded to three 12" per side. I cannot recommend this system enough. It is simply first class bass, and I have never heard anything better, even from Peak Consult, Stenheim or Magico.
While the initial investment is a lot of money, it is downright cheap considering the cost of for example ScanSpeak Revelator 28W ($700 each here in Denmark), plus finding a suitable amplifier and designing a crossover...
A local guy visited me and wrote an article about my speakers. It is in Danish, but can probably be translated: https://internetforbrugeren.dk/stor-og-fantastisk-lyd-i-stuen

The Priest

[aceinc]

Aceinc, when I developed and designed my linesources, I went through many of the same questions and dilemmas.
In short I realised that a two-way narrow baffle OB line source is not feasible if you want bass. Not at all.
After trying to cut corners with cheaper options, I ordered a set of dual 12" OB woofers and amps from GR-Research, which I later upgraded to three 12" per side. I cannot recommend this system enough. It is simply first class bass, and I have never heard anything better, even from Peak Consult, Stenheim or Magico.
While the initial investment is a lot of money, it is downright cheap considering the cost of for example ScanSpeak Revelator 28W ($700 each here in Denmark), plus finding a suitable amplifier and designing a crossover...
A local guy visited me and wrote an article about my speakers. It is in Danish, but can probably be translated: https://internetforbrugeren.dk/stor-og-fantastisk-lyd-i-stuen

The Priest

I bought & built a pair of GR Research dual 12" OB subs years ago. I have them in my HT system with Magnepan 2.7 QRs. I also have 3 other subs in that system, and it sounds good.

For fun, I am looking to build a line array to test/use in my 2 channel system. I have built pair of 8" OB speakers which sound good down to ~150hz. I am hoping to get 80hz or below out of the line array.

I haven't yet, but I will review the article you sent.

[Tyson]

It’s not a line array, but my NX-Oticas go down to 70hz in my room.  You might take some cabinet design queues from it.