Subwoofers and Crossovers.

I use a MiniDSP SHD as an active crossover for my passive 18 inch subs. I also use the included DIRAC room correction that performs DSP on both the subs and the mains.  bought the SHD from George at Deer Creek Audio and also gladly paid him to set it up and modify the program when I make system changes. It's all done remotely using a laptop and Team Viewer software. I never wanted to run my entire signal through a $1300 box, but I don't hear the SHD in the circuit except for the nice effects of the room correction and the seamless sub/mains integration. It's not the solution I would have expected I would buy, but it works extremely well. The SHD also allows you to time correct for the subs being set on a different plane than the mains. The MiniDSP SHD has a huge feature set for the money. 

Yes, kind of. The Lampi's analog output goes to my preamp, the preamp output goes to the SHD. The SDH converts the analog back to digital, performs Dirac room correction and performs the crossover high and low pass, then converts the digital back to analog and sends the analog output to the sub amps and also to the mains amp. What amazes me is that all that is pretty invisible as to a sound signature. For a year I didn't even try the full signal going through the SHD. I fed one output from the preamp to the mains amp and the second preamp output to the SHD to feed the subs. It's a very versatile box. You can even run it as a preamp and/or DAC and/or streamer as it includes a Volumino licence. The DAC is good but  does not stand up to the Pacific or the Vivaldi, but it comes too close for comfort. I say again, I was skeptical and didn't want to believe a $1300 component could perform like it does. 

dimbhaka, let me know if you agree with my assessment! Good luck!