Clients changed their minds…now what?

He wanted a dipole/OB. And I'm not sure the CBT would work, it usually needs the floor for the reflect image and 4" depth is likely not enough for a CBT.

I like the idea of a CBT standing beside that monolythic block instead of the old speakers, that could be an interesting design aspect with benefits regarding the acoustics as well as the design.
Unfortunately when the screen is lowered into the cabinet, that’s the max height of the system overall which is 34”……..the fact that the existing towers are taller I think has sparked this whole change order! Lol
 
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So if these will really play to 600hz IF I use four of them in a vertical array, I MAY have a shot here at a hybrid OB solution. I can add a vertical row of 8 3” neo woofers in a sealed section which will get me down to 80-90hz or so.

https://www.parts-express.com/GRS-PT6816-8-8-Planar-Slim-Tweeter-8-Ohm-272-128?quantity=1

I will wind up with an overall dimension of 5.75” x 32” which just fits and I get my OB pattern down through the midrange at least.
 
If you are going that route, why not use small SLOB arrays above and below the Neo Planers. You can get away with cheaper drivers that have high-ish Q and maybe not great 2nd order distortion. 90-100 Hz is doable open baffle with this configuration.
 
May I ask a really, really dumb question -- I've never had a HT/AV system! -- are well-localized soundstage and stereo-depth beyond the screen bad things to be avoided? They can't possibly match the content.

For "generalized" audio I just up-fire mono or stereo omni with HF enhanced; image floats midair well above and beyond the speakers (which must be phase-coherent). For "ultra-fi" I've been doing "LX" open-baffle/ultra-compact midtweeter over up-firing midwoofer, again image floats above; and wide directivity a bonus. (Pics in fullrange forum gallery.)
 
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I do that often with surrounds in 5.1 when there’s no distance behind the seating and it works very well…..combined with .2 Atmos in ceilings when possible, the crossfire between the upfiring and downfiring is eerily convincing and the best I’ve heard yet compared to side and rear surrounds fired at the listener

As for dipole front content, this should work well as the center channel which carries most of the location info and dialogue is monopole. Left and Right content is often mixed with a stereo bus and processed for depth and height. For music, if I can pull this off?…….should sound fantastic. Depends on what GRS has on paper compared to the reality. I’m counting on 4 of em to spread the load
 
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If you are going that route, why not use small SLOB arrays above and below the Neo Planers. You can get away with cheaper drivers that have high-ish Q and maybe not great 2nd order distortion. 90-100 Hz is doable open baffle with this configuration.
No room……Screen is 32” tall……that’s as tall as these can be to move with the screen into the cabinet.
 
I do that often with surrounds in 5.1 when there’s no distance behind the seating and it works very well…..combined with .2 Atmos in ceilings when possible, the crossfire between the upfiring and downfiring is eerily convincing and the best I’ve heard yet compared to side and rear surrounds fired at the listener

As for dipole front content, this should work well as the center channel which carries most of the location info and dialogue is monopole. Left and Right content is often mixed with a stereo bus and processed for depth and height. For music, if I can pull this off?…….should sound fantastic. Depends on what GRS has on paper compared to the reality. I’m counting on 4 of em to spread the load
Interesting crossfire, I'll have to try it.

Example for the console, omni Mark Audio Alpair 10.3 (7-14khz plateau) stationary inset cabinet top; if LX, fixed Alpair 5.3/7.3 (array or something more sensitive/efficient). Or the coax for either duty possibly even both.
 
I REALLY don’t want to go back to square one with this
Why not? If the client changed their mind, this becomes a change order. So bill them for the work performed to date and draw up a new quote for the new system. Once they see the cost of the change they might decide that those tower speakers weren't so objectionable after all... Or if they have money you at least get paid for the work performed.

Alternatively, how about turning the two sub cabs into a 2/3-way speaker? Maybe with a port on the front. Or maybe with some trickery in the XO to get the response you want.

Tom
 
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The Dayton linear motor drivers are appealing, but they are expensive for the amount of total displacement. These I think are a better choice. the are on special right now. They look good to 6 kHz so you could use a smaller planner, I have not see FR for the back, but it has a very open frame., so it has a high probability of good rear wave. DMA105-4
 
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