Adds two extra side speakers to the 5.1 setup for better spatial accuracy in larger rooms.
Modern buyers typically choose between these two paths based on space and complexity: Beginner's Guide to Surround Sound Setups - Sonos buy surround sound
The numbers tell you how many "points of audio" you have. The first number is the speakers, the second is the subwoofers, and the third is height channels. Adds two extra side speakers to the 5
Uses upward-firing or ceiling speakers to project sound from above, creating a 3D bubble of audio. 2. Soundbars vs. Traditional Speaker Systems the second is the subwoofers