l@deimos:~$ speaker-test -c8 -Dplug:surround71 -t wav

speaker-test 1.0.11

Playback device is plug:surround71
Stream parameters are 48000Hz, S16_LE, 8 channels
WAV file(s)
ALSA lib pcm.c:2017:(snd_pcm_open_conf) Invalid type for PCM surround71 definition (id: surround71, value: cards.pcm.surround71)
Playback open error: -22,Invalid argument
ALSA lib pcm.c:2017:(snd_pcm_open_conf) Invalid type for PCM surround71 definition (id: surround71, value: cards.pcm.surround71)
Playback open error: -22,Invalid argument
ALSA lib pcm.c:2017:(snd_pcm_open_conf) Invalid type for PCM surround71 definition (id: surround71, value: cards.pcm.surround71)
Playback open error: -22,Invalid argument
ALSA lib pcm.c:2017:(snd_pcm_open_conf) Invalid type for PCM surround71 definition (id: surround71, value: cards.pcm.surround71)
Playback open error: -22,Invalid argument
ALSA lib pcm.c:2017:(snd_pcm_open_conf) Invalid type for PCM surround71 definition (id: surround71, value: cards.pcm.surround71)
Playback open error: -22,Invalid argument
ALSA lib pcm.c:2017:(snd_pcm_open_conf) Invalid type for PCM surround71 definition (id: surround71, value: cards.pcm.surround71)
Playback open error: -22,Invalid argument