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JBL CBTs, especially the CBT-1000, look good when looking at the EASE data they provide. https://www.spinorama.org/speakers/JBL%20CBT%201000/JBL/index_vendor.html I believe the vertical polar map refers only to the measurement reference point. As you move up and down the radiated sound will...

Go for either model. You will have more bass than you'll know what to do with. You could save money by getting the RS1, but it seems like your heart is set on earthquakes.

Where did you get the picture?

24bit/44100.

See the attached papers or read Toole's book. What's your budget? Do you know how you are going to measure and adjust these subs? I assume an AVR. The determining factor here is your budget. Just to be clear, this is not important for well-designed subs.

Sure. Use VB Cable routing: https://vb-audio.com/Cable/

For reference: https://www.audiosciencereview.com/forum/index.php?threads/subwoofers-a-need-for-lower-distortion.47492/page-2#post-1701949 https://www.audiosciencereview.com/forum/index.php?threads/subwoofers-a-need-for-lower-distortion.47492/page-2#post-1705046

I'm not sure how your system is setup, but in a DAW you can use several channels: so create a crossover and apply Hx to the lower region.

If the OP can afford the subs and likes how they look, and wants to play "make the walls shake", it's fine. I don't think we should arbitrate how another person will spend their money. If the OP is making the mistaken assumption that small subs cannot produce sufficient bass or that very high...

Here's how I think about it (after spending a lot of time reading, it is a pretty simple problem in the end, once you know what does/doesn't matter): 4 subs makes sense if you are following the Welti/Harman approach to smoothing FR across many positions. How much SPL do you need? JTR 4000ULF...

I think it is helpful to understand how subs work. In your advice, you caution against too many subs because they will "overwhelm" the room. Since that will not happen, the OP has the much simpler task of calculating the SPL they want to achieve and can reduce the number of subs as needed.

Tuning a system with subs—I mean measuring response and establishing correct levels, gain, bandwidth, crossover and EQ. How many subs a person needs and what size they should be are then a question of SPL vs. frequency (which can be approximately calculated fairly easily). I was specifically...

There is no such thing as "overwhelm" in a tuned system. A lot of unused headroom, sure.

https://www.audiosciencereview.com/forum/index.php?threads/dayton-audio-opal1-speaker-launches.53722/

They undergo a heavy battery of measurements before commercial release. There are strict standards that have to be met in both production and distribution. Mastering screens have apparatus built-in, both for measurement and display: Music is also measured for commercial distribution and has...

What flippant comments? There's nothing negative here: https://www.audiosciencereview.com/forum/index.php?threads/bacch4mac-pro-edition-a-report.2373/page-4#post-75283

Right, because sound is like a laser beam. Goes straight and does not deviate. Walls? Whatever.

Could you please do 10 degree and 30 degree horizontal off-axis measurements as well?

Are you sure that you want to introduce a double negative?

Is this book about Vaucanson's duck?