A full 8' wall cavity with standard stud width is approximately a 3 cubic foot enclosure. I doubt that a .75 to 1.0 will sound very good, probably poor bass response with just an overall thin sound.
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Sorry Peter, guess I should have looked at the speaker first. I see that there is a back box enclosure and it is less than 1/2 cubic foot. There are so many in-walls, and I do know from experience that some do not sound very good when installed in a very small wall cavity. I'm sure it depends on the speakers' design.