I've pulled off in-wall subs with great results, BUT there are definitely compromises. I had no resonance issues, but you likely won't get the same output as with an equivalent stand alone sub. To me, the biggest downside is that you're stuck with the location, so you better have that thing super well planned out and your estimations correct, because you have to prewire, then place in the preconstruction box (which gives you your internal volume and port), and then once that dude's sheetrocked in, yeah, it's there for good. Hope you got it right! I did thankfully, but there's no "subwoofer crawl" going this route. Don't get me wrong, there are absolutely some great applications for going the in-wall sub route, but if I have my choice and the space for it, I want a stand-alone subwoofer most of the time.