
To test speaker channels under Ubuntu, launch the Terminal and issue this command:
speaker-test -D plug:surround51 -c 6 -l 1 -t wav
You will hear a sound coming from your different speaker channels (Front Left, Center, Front Right, Rear Left). Here is a sample of the output you may get:
~$ speaker-test -D plug:surround51 -c 6 -l 1 -t wav
speaker-test 1.0.24.2
Playback device is plug:surround51
Stream parameters are 48000Hz, S16_LE, 6 channels
WAV file(s)
Rate set to 48000Hz (requested 48000Hz)
Buffer size range from 64 to 349504
Period size range from 32 to 174752
Using max buffer size 349504
Periods = 4
was set period_size = 174752
was set buffer_size = 349504
0 - Front Left
4 - Center
1 - Front Right
3 - Rear Right
2 - Rear Left
^[[D^[[D^[[C 5 - LFE
Time per period = 21.901517
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