u236@ubuntu:~$ speaker-test -Dplug:surround71 -c8 -l1 -twav

speaker-test 1.0.14

Playback device is plug:surround71
Stream parameters are 48000Hz, S16_LE, 8 channels
WAV file(s)
Rate set to 48000Hz (requested 48000Hz)
Buffer size range from 16 to 4096
Period size range from 8 to 2048
Using max buffer size 4096
Periods = 4
was set period_size = 1024
was set buffer_size = 4096
 0 - Front Left
 4 - Center
 1 - Front Right
 7 - Side Right
 3 - Rear Right
 2 - Rear Left
 6 - Side Left
 5 - LFE
Time per period = 11.307930
u236@ubuntu:~$