Question for experienced distributed bass array users

Hello.

I run an active multichannel stereo system where everything below 70Hz is handled by one channel that sums R + L and sends to two subs. The subs are sealed DIY enclosures for Rythmik DS1200 kits and I want to add one or two additional subs to create a DBA. Ideally I would build additional units based on the same Rythmik kits which provide good flexibility through their PEQ plate amps. But I live overseas and importing these becomes expensive. Plus I recall Earl Geddes saying the third & fourth sub didn’t need to be powerful or as good as they do less work, and commercially available DBAs I understand aren’t necessarily 12” or include PEQ options.

So I’m considering to build sealed DIY boxes with suitable 10” pro drivers and locally available, non-audiophile grade class D amps, and use together with the Rythmiks. All the subs would get the summed mono signal with digital room correction applied to the channel.

What do you guys think? Better to get one Rythmik kit or two plain Jane smaller sealed boxes?

Thank you in advance!
Horacio

PS: Please let’s not go into merit/demerit of DBAs. I’m convinced it’s the way I want to go; just asking for opinions from experienced users about alternative paths to it.