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Hi Folks,

I have a pair of 18" subs tuned to 15.5hz.
And I am building a 15" mid-bass module tuned to ~42hz.
I have REW (beginner level knowledge) and have a MiniDSP HD and UMIK USB mic.
My AVR has two sub outputs, each separately handled by Audyssey XT.
My front main speakers are -3dB about 40hz.

The subs are behind my leather couch and I get almost no mid-bass from them.
The MBM will be placed in the right-front corner of my home theater.

I'd like to Lowpass the subs around 50hz and Highpass the MBM around the same 50hz.

Are there any guides specific to what I'm trying to, that will help guide me through this process?