miniDSP SHD integration

I think the easiest thing for you is going to be to put the miniDSP right before the sub. That’s where most of your bass issues will occur anyway, and miniDSP is pretty transparent, especially for subwoofers.

Plug the ports on the back of your main speakers, this will make integration easier and lower the distortion and bass output.

I’ve had a great deal of success with this alone.

If you wanted to take this 1 step further, put a capacitor in line with your amp. This will give you a 6 db/octave high pass filter. Use about 0.04uF for an 80 Hz high pass filter.

Of course, if you are experimenting, at each of these steps you’ll need to remeasure.

Almost forgot:  Seek out the AM Acoustics room mode simulator and try to keep your sub, speakers and listening location outside the lowest room modes.

Ok, to be clear you are talking keeping everything as is except connect the miniDSP to the sub out on my preamp, then to the sub to control low pass and subwoofer room control. 
Then use a pair of capacitors on the speaker out to control high pass, without room correction. Interesting!

There is also the Mini DSP Studio SHD. Streamer > Studio > DAC> preamp. You can then do Dirac live room correction. Contact Deer Creek Audio for guidance on this.

OP:  You read that correctly.  this is pretty much the way the great Floyd Toole recommends.  His point, and I agree with it, is why buy a certain pair of speakers you like the sound of and then try to EQ them to sound like somethig else? Except in the bass, where all sorts of nasties lurk.

To clarify:  I'm paraphrasing Toole's take on EQ, but the suggestions for plugging the ports and using a high pass filter on the mains is not part of his argument.