A 5.1 system (five speakers and a subwoofer) is considered the standard for an immersive home theater experience. However, 7.1 and 9.1 systems can provide an even more engaging audio environment. Dolby Atmos and DTS can introduce height channels to a traditional 5.1 or 7.1 setup, creating 3D soundscapes through additional speakers mounted overhead or using upward-firing capabilities.