Most inwalls are just a speaker baffle utilizing the wall cavity as an enclosure. This cavity doesn't necessary have consistent volume from one speaker to the other. In addition you're going to deal with bleed through into adjoining rooms. Several speaker companies make an enclosure, but you're dealing with new constuction or remodeling to accomodate. Triad Speakers make an easily retrofittable inwall built in a sealed enclosure. The xover is designed for this exact application. Other inwall enclosures guess on the atypical volume of a stud length set on 16" centers. Too many variables for consistent sound quality. In addition to Triad, I believe Snell has a new line of architectural, Bass Speakers (?) out of San Diego, Speakercraft. Best,. DC