Sorry watchdog, finally getting back to this one.
If you have Prodigies, and are upgrading the panels, that a great start.
Since you have the electronics in the Prodigies, then just use those. As you saw in my mods for the SL3XC, it’s ‘easy’ to bypass all the passive crossover components and just use the ESL step-up (audio and voltage) components.
So no new parts required. It’s all there in the Prodigies.
Now, if you want to remount the panels in some new structure, go right ahead and engineer something strong, stable and with a place to mount the energizing board (and ESL audio step up transformer).
If combining this with a companion line-array (wonder where I’ve heard of that before
), then I’d recommend building a common mounting solution, as the line array should be as close as possible to the Panel (and at least as long, but could extend a 14” or so above and below if more mid-bass is desired or if using small drivers (e.g. 4”) ).
Now, for crossovers, I’ve not measured a prodigy panel, but I’m guessing that much like the other panels, it starts loosing output capabilities (at higher SPL’s) around 250Hz. Please note that even the much larger Monolith panels I use are crossed over above 250Hz (around 315hz right now).
So, I’d start by setting the TacT pre to send anything above 250hz to the panel using a 48db/octave slope. Send 60 to 250hz to the line array with 24 db slope low-pass at 250Hz and a 48db high-pass at 60Hz. Sub obviously low-pass at 60Hz with a 48db slope.
The reason for recommending a shallower slope on the 250hz mid-bass low-pass is that we want a bit more output in the upper mid-bass to come from the line-array to help compensate for the dipole cancelation that the panel will have at those frequencies.
Use the TacT measuring system to ensure that all speaker phases are correct independent of each other (turn off their respective amps or disconnect them), if you can control delays in the TacT, then set them based on physical distance (or better - measured impulses responses).
Ultimately, the TacT measurement system will phase and time-align the results, but best to start with something close to right.
Which TacT gear do you have?