Connecting 2 JL Audio F112v2 subwoofers to a Luxman C-10x and M-10x combo

can you not output XLR from the Preamp into the power amp

and at the same time output from the RCA outs on the Preamp into the first subwoofer and then chain that to the other sub.

Once the setup above is done, use the crossover, phase, and level controls on your JL Audio F112v2 subwoofers to integrate them with your main speakers.
The F112v2 also features the D.A.R.O.  system, which you should definitely use with the included microphone to optimize the subwoofers’ response in your room. @sdavada 

you can verify this with JL Audio though

Thanks @kofibaffour. From what I’ve read, the pre will only let me use xlr or rca output one at a time. 

Ah I see. Then a DSP Bass Management tool is what you need @sdavada 

and then get more or less "dumb" subwoofers so you let the DSP tool do all the crossover, phase dialing stuff

I believe that the Pre needs to be put into Bi-Amp mode to activate both pairs of outputs.  I would look into this as a solution.  One pair of the outputs will feed the amps and one will feed the subs.

I have the 112V2s as a pair.  I am running them in "stereo"  from my pre, with a L output into one sub and the R output into the other.  I have not slaved them with one sub feeding the signal to the other.  The advantage of using my "stereo" setup is that each one can be tuned and DAROed independently and this helps reduce nulls.  I believe that the slave mode is designed for applications of > two subwoofers where DSPing more than 2 subs dilutes the results because there is so much more sub coverage.   Good luck and cheers.

@rick_n thank you.  I'll have a read of the bi-amp path

Quick update.  Decided to go with a pair of REL Specials as their neutrik connectivity gets me working without the need for additional equipment. Thank you all for your responses.