cedric@asterix:~$  speaker-test -c2 -Ddefault -t wav -l1

speaker-test 1.0.15

Playback device is default
Stream parameters are 48000Hz, S16_LE, 2 channels
WAV file(s)
ALSA lib pcm_direct.c:867:(snd_pcm_direct_initialize_slave) snd_pcm_hw_params_any failed
ALSA lib pcm_dmix.c:878:(snd_pcm_dmix_open) unable to initialize slave
Playback open error: -22,Argument invalide