Integrated Amp) Sub-out > MiniDSP > Pre-in on same amp (?)

Hello,
I am looking at the Doge 10 MkIII tube amp (integrated)
The amp has a sub-out, which Doge tells me is not low passed (is full range)
The amp has a Pre-in

Could I run a cable out of the sub-out, into the MiniDSP 2x4 (split the bass off to woofers) and then run the mid and high-range output (minus woofer bass) back into the pre-amp of the same amp?

My goal is to be able to run a 2 way speaker with an active X-over using a tube amp.

Then other option would be to split the source through the MiniDSP and then only feed the mid/high into the pre-in of the Doge ... this would be bypassing the Doge preamp section and only using it as a power amp.

I was hoping to use the pre and power stages.


Hope the is clearly enough written! Thanks for your imput / ideas!