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 industryΓÇÖs most severe bench-tests covering every aspect of audio performance to satisfy THX requirements. With 220 W per channel at your disposal, the TX-NR777 is ready to fill large spaces with heartpounding sound. Object-based soundtracks allow independently mixed sound to play through any speaker in your system, moving above and around you with breathtaking realism. The TX-NR777 reproduces 5.2.2-channel Dolby Atmos or DTS:X formats, with AccuReflex correcting the phase of direct and indirect sounds for cohesive audio imaging with Dolby Atmos-enabled speakers. Six rear HDMI inputs support pass-through of HDR10, HLG (Hybrid Log-Gamma), and Dolby Vision; the BT.2020 4K video standard; 4K/60 Hz video playback; and HDCP 2.2 for premium video content. The Polk Audio TSi500 floorstanding Speaker is the flagship of the TSi series. With four 6.5-inch drivers, it has the power handling and bass response to sound spectacular. Pair them up with a CS20 center, TSi200's for surrounds and a PSW series subwoofer and you'll have one incredible sounding home theater system! This speaker is awesome for high impact movies and music. Its affordable price and small footprint means they can be used as the front channels in a home theater system or as the main speakers in a music system