They're designed to mount in your wall between the studs and use the entire area between the studs as an infinite baffle. With 90db efficiency and an 8 Ohm load, they're very easy to drive.
Phil Clements has been designing speakers since 1976 and is one of the few guys still around who offers great products at very reasonable prices. I'm still fond of his old RT-7 floor standers which used ribbons and transmission line loading.
Do yourself a favor and check him out.