The thinnest at a mere 2.2" depth and the largest, most powerful drivers in its class - (2) - 3.5", long-throw, glass fiber woofers and a 1" aluminum tweeter. The SLIM-100 utilizes a 100% extruded aluminum enclosure and can mount against a wall with zero-gap or can utilize the display stand (SLIM-STAND, sold separately) for surface mounting horizontal or vertical.