The TL parameters will guide you on the enclosure loading.
Otherwise look at how Jbl used this driver.
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Jbl actually use small diameter drivers in some in some of their pro array systems above the 10 or 12 inch differential drivers. Have a look at the brochures.
Below is a link featuring the jbl 261F.
It’s a compact enclosure of about 1.00 cuft3 or less with low end response to about 70 hertz. The crossover is 1800 hertz and a graph of the design. You have not disclosed your end use application ie SR or domestic use so the suitability of this driver cannot be determined other than Jbl EON which is JBl entry level SR system. Drivers for SR or music amplification are not primarily designed for high quality music playback unless otherwise stated. They are designed to be robust and played very loud with distortion being an acceptable compromise. If you compare it to the 728G also a differential driver the similarities stop there.
My suggestion is to adopt the early Jbl approach of deliberately limiting the bandwidth of this driver so you are operating it in it’s optimal range. Your measurements and listening tests will validate this approach. This is how Jbl used its pro drivers in many of the pro 43XX studio monitors and they were a great success. This type of empirical approach is quite effective providing you put the work in. Modern simulation by computers still needs real mock ups to validate the design as such simulations rely of a number of assumptions which in practice are rarely true.
As l mentioned get an REW test rig going and start measurements. Once you be familiar with your measurements what they mean there is no turning back. But use your ears to validate your design too. It might take several mock-up ideas before you settle on design thee as t is feasible with acceptable compromises.
Enjoy your project and keep in touch.
Ian
https://reconingspeakers.com/product...r-for-lsr708i/
https://jblpro.com/products/708i
https://jblpro.com/zh/site_elements/eon510-spec-sheet