A51 Pro Beyond 5.1CH: 7.1CH-Like Immersive Soundscape: Unlike regular 5.1CH systems, the A51 Pro features two side tweeters and a dedicated center tweeter, expanding the soundstage for richer, more dynamic audio and clear dialogue. Two rear surround speakers and a powerful 6.5' subwoofer deliver deep, distortion-free bass for immersive surround sound. (Note: New firmware with personalized memory function and improved performance (released 2/21) is available and can be applied as needed) Feel the Full Spectrum of Sound with Dolby Atmos: This advanced surround sound system features premium upgrades in materials and speaker configuration, now enhanced with Dolby Atmos for a truly elevated audio experience. Dolby Atmos delivers lifelike 3D sound, immersing you in a cinematic atmosphere. Perfect for home entertainment, it transforms your space into a dynamic, multidimensional sound theater, making every movie and music session a blockbuster HXS Processing - Precision-Tuned Crystal-Clear Dialogue: Upgrade your audio experience with HXS Processing (ClearVoice Technology) and our advanced racetrack drivers, a clear step beyond traditional round speakers. The racetrack design broadens sound dispersion, enhancing bass and mids.