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vante wrote:

Sorry, for not understanding your question.
I feed the SHD with left and right from my preamp. and in SHD I mark both "Dirac 1" and "Dirac 2". I guess there vill be a sumation of the signals. 
Once again, Thanks for your answers..

If for any output you have both Dirac 1 and Dirac 2 set as '0 dB' then that output with be sent the sum of the two inputs to your SHD. The picture below shows this for one Sub output, and I'll bet you just have the same for all four of your outputs?

www.minidsp.com/images/appnotes/shd-sub-v2/shd-sub-routing.png

Yes, so it is.
I never had any thoughs of mono or not in the sub region. But of course I don´t want to miss out a subsignal from maybe one stereo channel.
For now ( a few days) I´m satifyed whith the sound. The basemembrans hardly moves, but "smear" out a fairly even bass in the room with an unaffected stabile sound image. 
Should I give Dirac a chance to see  if it could be even better? in the upper frekvenses it was a dissapointment for me. After a year i´m pretty sure it´s not doing me any good in the upper regions.
But maybe someone else have better experience?.

vante wrote:

Should I give Dirac a chance to see  if it could be even better?

If you only have subwoofers connected to your SHD then you can't use Dirac Live. It requires full frequency range signals.

Aha..realy ..ok .

 yes of course ..the timing signal.

vante wrote:

 yes of course ..the timing signal.

Dirac doesn't use a seperate timing signal like REW but the high frequency content of the sweeps will still be used to assess arrival times. I have a feeling that I've read about an older version of Dirac Live somehow working on just subs but for the current version I'm sure it doesn't.