In wall can be done properly. Typically the limiting factor is the woofer used due to depth.
it is extremely important to start at the end product and work your way back from there. What I mean by that is how do you want the final finished look to be? That will help determine your options.
Is your wall 2x4 or 2x6 construction? Is your wall load bearing? Have you been able to sample the response in room from that location?
It is best to answer these questions appropriately before you even think about the product used.
Great to hear from you again annunaki.
Your second paragraph is right on target.
This in wall system will not fit in a 2 X 4 or 2 X 6 wall. This build is for new construction, or old, if a false wall can be placed. This is not a load bearing wall. The load bearing wall is right behind it, but it is not a stud wall. This house in an insulated concrete form home (ICF) home. The home is built of polystyrene block like a Lego construction with lateral and vertical reinforcement. The pumper truck then comes on site and fills the 6" space between the inner and outer layers of polystyrene. You then have an enormously strong and insulated house that a a very high R factor in one shot.
This is a link to the rebuild from Benedict to Eagan MN.
The reason behind all this is that my wife wanted "her own" system in the main level lower great room. She wanted it to be a good system but did not want any "boxes' in the room. I think it is the latter that women object to most about sound and AV systems. So I have always tried to oblige in many of my designs.
So I decided to build out by extending the fireplace chimney breast.
Most of the depth is required for the pre/pro and power amps.
This is the size of the Sub.
Then you get my wife's directive fulfilled.
This is the model of the sub. George Auspurger published his mathematical model of the TL in 2000. He was king enough to share his software with me.
There are a number of models out there, but George Auspurger's is the correct one. I have used it enough now to know that it is highly predictive of the final result.
Because of room gain the bass extension seems always a bit better than the model.
I have not had a chance to measure this sub. But it is highly efficient and power has to be reduced 10 db relative to the other speakers. I have listened to a lot of material through it including large pipe organs. They are produced with tremendous authority and the bass is really tight with no overhang or boom. The space is large and open, but this one 10" driver fills the space evenly, even at power. This is actually a very potent system with very high powered drivers. The total amp power available is 1000 watts. Even driving the system hard with a lot of deep bass content, I have not heard the woofer bottom or show any signs of distress.
I have not had a chance to measure it yet, but I will get round to it and put them up here.
Subjectively it is a potent sub with a very accurate and controlled bass. For certain I have never heard another 10" sub come close to the performance of this sub.