[imcarthur]

Originally Posted by Eric Coffey

If you are looking for really "good sound" and "decent bass" in-walls are probably the worst option

That says it all. In very simplistic terms, bass drivers work by compressing the air in the box to assist them in exciting the air in the room. Less compression = less excitation = less bass. The airspace in the wall & ceiling is unknown & undamped & usually - esp in a ceiling - a large volume of totally uncontrolled air. This all means that the vast majority of inwall designs do a very poor job of reproducing lower mid-bass. let alone anything usable below 100Hz. The best inwall/inceiling designs all come with a pre-made back box to provide a known airspace. You can fab your own by framing the studs behind the speaker to seal the airspace & adding some insulation. Not ideal but far better than nothing.

Ian