> aplay sine.wav
Playing WAVE 'sine.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Mono

> speaker-test

speaker-test 1.0.23

Playback device is default
Stream parameters are 48000Hz, S16_LE, 1 channels
Using 16 octaves of pink noise
Rate set to 48000Hz (requested 48000Hz)
Buffer size range from 2048 to 16384
Period size range from 1024 to 1024
Using max buffer size 16384
Periods = 4
was set period_size = 1024
was set buffer_size = 16384
 0 - Front Left
Time per period = 2.618271
 0 - Front Left

Vagrant.configure("2") do |config|
  config.vm.box = "centos-6.5"

  config.vm.provider "virtualbox" do |v|
    v.memory = 2048
    v.cpus = 2
    v.customize [
      "modifyvm", :id,
      "--ioapic", "on",
      "--audio", "coreaudio",
      "--audiocontroller", "ac97"
    ]
  end
end