I am looking for a similar solution ... after searching a lot and asking questions in this and other forums, it seems there are some other quality options from makers such as ACI and North Creek. These systems are, according to the makers, designed for a shelf application. For example,
http://www.northcreekmusic.com/OkaraII/OkaraII.htm#SpiritReviewComments
http://www.northcreekmusic.com/OkaraII/OkaraII.htm#SpiritReviewComments