bobby@bobby-ubuntu:~/Desktop/DOWNLOAD$ speaker-test -c2 -Ddefault -twav

speaker-test 1.0.13

Playback device is default
Stream parameters are 48000Hz, S16_LE, 2 channels
WAV file(s)
ALSA lib confmisc.c:1105:(snd_func_refer) Unable to find definition 'defaults.pcm.dmix_rate'
ALSA lib conf.c:3500:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory
ALSA lib conf.c:3957:(snd_config_expand) Args evaluate error: No such file or directory
ALSA lib pcm.c:2143:(snd_pcm_open_noupdate) Unknown PCM dmix:Revolution71,FORMAT=S32_LE
Playback open error: -2,No such file or directory

bobby@bobby-ubuntu:~/Desktop/DOWNLOAD$