There are a number of reputable vendors that make great in wall systems and subs. I don't recall if they go down to 20HZ but try Wisdom and Paradigm and Triad to begin with. There are some other companies that I've come across that I can try to reference and post. I have an Atlantic Technology in wall sub in my secondary system. The only caution I will tell you from experience is that some in wall subs have certain requirements for sheetrock. I used 3/4" sheet rock and soundboard. So my actual wall thickness is 1" plus. You then need to match wall thickness with the mounting. And finally, you may or may not need insulation in the cavity. And finally, finally it's going to be hard to predict room resonances so I highly recommend room correction for the sub.
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