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Surround Sound Channels explained – the differences between 5.1, 5.2, 7.2

5.1 CHANNELS

5 Channels of surround consisting of a left speaker, centre speaker, right speaker and a rear-left and rear-right speaker. The .1 refers to a single subwoofer.

5.2 CHANNELS

The same as a 5.1 system but the .2 now refers to there being 2 subwoofers.

7.2 CHANNELS

7 Channels of surround consisting of a left speaker, centre speaker, right speaker, a rear-left and right-speaker, and two additional surround speakers typically installed on the side walls. The .2 refers to two subwoofers as part of this system.

5.1.2 CHANNELS

5 Channels of surround consisting of a left speaker, centre speaker, right speaker and a rear-left and rear-right speaker. The .1 still refers to a single subwoofer. The .2 in this instance refers to “Dolby Atmos” in-ceiling speakers, which are installed on the ceiling above or high up on the wall well above your seating position to deliver overhead sound. Think of the sound of rain above you, or a helicopter flying over your head.

7.2.4 CHANNELS

This combination is typically used in larger home cinema rooms. It combines all channels we have mentioned above. 7 Channels of surround consisting of a left speaker, centre speaker, right speaker, a rear-left and right-speaker, and two surround speakers typically installed on the side walls. The .2 refers to 2 subwoofers as part of this system, and we now have a total of 4 “Dolby Atmos” in ceiling speakers providing overhead sound.