ManagementObjectSearcher objSearcher = new ManagementObjectSearcher(
       "SELECT * FROM Win32_SoundDevice");

ManagementObjectCollection objCollection = objSearcher.Get();

foreach (ManagementObject obj in objCollection)
{
    foreach (PropertyData property in obj.Properties)
    {
        Console.Out.WriteLine(String.Format("{0}:{1}", property.Name, property.Value));
    }
}