Stereo Channel DSP for 2.1 System?

Hello,

im using CamillaDSP on my Raspberry PI for room correction for my Active Speakers that go down to around 40 HZ (-/+0db) and wanna consider buying a Subwoofer down the line to go down to around 20hz

my question is, would it be possible to buy a active studio type subwoofer with crossover built in (so you go with Stereo XLR into the sub, it handles the crossover and go out with XLR to the main speakers) so i can actually build a 2.1 system that is DSP corrected with just a 2 channel dac? or would it be far more beneficial to go with a multichannel dac so i can DSP the subwoofer seperately?