Triad's New Subwoofers
Cinema Subs - 12" and 15" now available.
Triad's New SlimSubs in 8", 10" and 12" sizes.
Info here.
Those speakers will not fit in a standard stud wall, as the actual space between the studs is 14". The code is 16" center to center. So anything wider than 14" and a bit less actually for clearance, will not fit in the stud space.
This is the huge barrier to inwall systems. The only solution in my opinion is a new false wall in front of the existing wall. I don't see any other way round it. That is what I did with my in wall system.
I think in wall systems have a lot to recommend them from an interior design standpoint and social acceptance. The problem is that you can't design one that is any real good working with 14" stud spacing. That system creates more acceptance and interest from visitors than any of the three systems here. It sounds really good as well, and fills this very large space easily and without distress. WAF factor is high. My wife had the idea for this, it was her idea and I did it entirely at her request. We both use it a lot, especially her.
So, good for an in wall system does not cut it, in my view. It needs to be a good system period and you won't get there working around 14" stud spacing.
When you think about it, and the cost of current gear, a few 2 X 4s, sheet rock finishing and paint is minor compared to the cost of the rest.