chris@XBLADE ~ $ speaker-test -c6 -Dplug:dmix6 -twav

speaker-test 1.0.14rc1

Playback device is plug:dmix6
Stream parameters are 48000Hz, S16_LE, 6 channels
WAV file(s)
Rate set to 48000Hz (requested 48000Hz)
Buffer size range from 2048 to 5120
Period size range from 1024 to 1024
Using max buffer size 5120
Periods = 4
was set period_size = 1024
was set buffer_size = 5120
 0 - Front Left
 4 - Center
 1 - Front Right
 3 - Rear Right
 2 - Rear Left
 5 - LFE
Time per period = 8.532011
 0 - Front Left
 4 - Center