Does anybody make...

I don't have a preamp and I'm quite happy with the level of control I have at hand.

Eq and balance, DSP as desired (or not).....a 2496, or not...🤷‍♂️

Distrib amps can be as simple or as complex as one could ask for of late, wallet thickness being ones' guide or limit.

I've 6 amps in a 50ish lb. lump.  2chan each, buss or stand-alone input, bal & vol each, delay each, and any can be mono'd for sub or just the bang of it.

Each amp can drive up to 4 drivers, if you don't ask the impossible from it.

No, it's not likely you'll discern the sweat on the palms of the 1st violinist in the midst of that solo...but I don't kid myself into thinking I can hear such....

But, it pleases me in the OTW I'm up to, and it didn't require a 2nd mortgage that I couldn't do anyway....

(No, I've not tried 24 drivers.  I've enough cables already just for the nonsense I'm doing anyway...and suspending that many cables off the floor would look like a WW2 tank trap to maneuver around....I'm not insane, just....'odd'....*L* ;)...)

...a physical therapist once called me 'Gumby'.....little did she know.....*L*

@asvjerry  I'm not insane, just....'odd'....*L* ;)...)

No, just someone with character, LOL... I suspect your setup/suggestion is a bit above me, thx.

@rbstehno thx, that's new to me, I will look into it...

Marchand Electronics, I wish I new about them sooner, they would have saved me a huge headache getting a power supply made for the field coils. But I will look into it for the preamp...

Received an email from McIntosh,.. their C2700 does not have adjustable gain, bummer. But I do want a tube preamp...

@sc2  *L*  I will thank you for noting that observation.... ;)

And my setup is a tad 'above & beyond' what most would strive for, but is driven by intent & budget restrictions for the most part.  It scratches my particular itch....

https://www.sweetwater.com/store/detail/DCX2496LE--behringer-ultradrive-dcx2496le-loudspeaker-management-system

...ought to allow for the flexibility you'd desire, but will require separate amps for each output obviously.  You could 'dial in' what works for the separate elements in your quest, which is similar to what I'm about with my meanderings....

It does come down to what you hope to accomplish, by ear or directed by measurement and analysis.  Either way, good luck with the project. *S*

Nobody has said one can't think outside of the box, esp. when dealing with flat panel arrays.... ;)  You're into dipole territory, which is decidedly different than the conventional; the space you're working within will 'have a say' in results as well...

"Life: Your results Will vary...."

Have fun, J

@millercarbon I think has the most practical solution to what you described assuming your pre-amp I assume has low enough output impedance to run essentially 4 passive volume controls. You could use a trim-pot to get the balance right, then some good quality resistors for the final implementation. We are only talking 1/2 watt resistors so cost is minimal.