GNU/Linux Desktop Survival Guide by Graham Williams
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Test Speakers

$ aplay -L
default
    Playback/recording through the PulseAudio sound server
[...]
sysdefault:CARD=USB
    ThinkPad Thunderbolt 3 Dock USB, USB Audio
    Default Audio Device
front:CARD=USB,DEV=0
    ThinkPad Thunderbolt 3 Dock USB, USB Audio
    Front speakers
surround21:CARD=USB,DEV=0
    ThinkPad Thunderbolt 3 Dock USB, USB Audio
    2.1 Surround output to Front and Subwoofer speakers
surround40:CARD=USB,DEV=0
    ThinkPad Thunderbolt 3 Dock USB, USB Audio
    4.0 Surround output to Front and Rear speakers
surround41:CARD=USB,DEV=0
    ThinkPad Thunderbolt 3 Dock USB, USB Audio
    4.1 Surround output to Front, Rear and Subwoofer speakers
surround50:CARD=USB,DEV=0
    ThinkPad Thunderbolt 3 Dock USB, USB Audio
    5.0 Surround output to Front, Center and Rear speakers
surround51:CARD=USB,DEV=0
    ThinkPad Thunderbolt 3 Dock USB, USB Audio
    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
surround71:CARD=USB,DEV=0
    ThinkPad Thunderbolt 3 Dock USB, USB Audio
    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
[...]

$ speaker-test -t wav -c 6

speaker-test 1.2.2

Playback device is default
Stream parameters are 48000Hz, S16_LE, 6 channels
WAV file(s)
Rate set to 48000Hz (requested 48000Hz)
Buffer size range from 32 to 349525
Period size range from 10 to 116509
Using max buffer size 349524
Periods = 4
was set period_size = 87381
was set buffer_size = 349524
 0 - Front Left
 4 - Centre
 1 - Front Right
 3 - Rear Right
 2 - Rear Left
 5 - LFE
Time per period = 8.736032