What's the LARGEST possible speaker? I'm talking about what's possible.

You don't need to have ONE really large-diameter speaker to have loads of SPL:

 

I believe the largest relatively common size of driver is 21".

This site claims the largest at 80" and the page appears to have a YouTube video. WORLD’S BIGGEST SPEAKER 80 Inch « Alex-Audio – Professional sound equipment, Acoustic systems. Perfection Sound (alex-audio.com)

 

I've seen at least a few 24 inchers, Precision Devices have a couple for starters.

 

And it's 8 Ohms, so if you need more volume, you can add another one later!

 

Looks cool....specs aren't too impressive for the size if referenced to 1m.

 

You buy 34" or possibly larger drivers, but AFAIK they are pretty rare.

 

A large stiff plate driven to vibrate - your imagination is the limit

 

https://www.psaudio.com/wp-content/uploads/2017/04/MOAS-3.jpg

 

I believe ELP toured with these on the "Welcome Back..." tour.

 

It’s debatable if you want to call it a “speaker” but check this out.

 

Encyclopedia of Organ Stops

 

There was a story about a guy who played Washtub bass who ran a cable to the center support of a building in Vietnam and "played" it
In theory, there's no limit to speaker size. In reality. the larger the diameter, the slower the response.

 

Sounds like the “Cosmic Beam” instrument

 

You don't mean "The Beam", as played by Mickey Hart?

 

Hartley Main Page

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