The RZ Series A/V receivers deliver a significant boost to the dynamism, detail, and accuracy of music and movie soundtracks for a listening experience that packs deep emotional impact. THX certified select guarantees the same high-volume sound you experience at a commercial theater in your home. To gain certification, amplifiers must pass the industry's most severe bench-tests covering every aspect of audio performance. THX certified select components are ideally suited to rooms where the screen-to-seat viewing distance is approximately 3-meters (10ft) and the room volume is approximately 57-cubic meters (2000 cubic feet).