Sonodyne IWO is pure innovation. In modern homes with premium space, these exquisite loudspeakers virtually disappear. Slim (less than 4") they can be mounted on the wall, AND, using a proprietary mount, can also be mounted IN WALL. Using minimal internal volume, this range produces big, detailed sound. So while the IWO. does not intrude into your space, it does add a new dimension to your sound.