In a 7.1 surround sound system, what do the numbers in 7.1 refer to?
A.
A signal-to-noise ratio of 7:1
B.
Seven speakers and one low-frequency-effects speaker
C.
The version of the noise reduction being used
D.
The number of speakers in the front and the back
Explanation:
http://www.webopedia.com/TERM/7/7_1_surround_sound.html