Why is the size fixed to 16384?

[C# Programming]

In the following code, the size or the array is fixed to 16384 and I made changes to it to get errors. Can someone clearify why it is fixed?

byte[16384]???


private void Start()
{
Stop();
try
{
WaveLib.WaveFormat fmt = new WaveLib.WaveFormat(44100, 16, 2);
m_Player = new WaveLib.WaveOutPlayer(-1, fmt, 16384, 3,
new WaveLib.BufferFillEventHandler(Filler));
m_Recorder = new WaveLib.WaveInRecorder(-1, fmt, 16384, 3,
new WaveLib.BufferDoneEventHandler(DataArrived));
}
catch
{
Stop();
throw;
}
}


private void Voice_In()
{
byte[] br;
r.Bind(new IPEndPoint(IPAddress.Any, int.Parse(this.textBox2.Text)));
while (true)
{
br = new byte[16384];
r.Receive(br);
m_Fifo.Write(br, 0, br.Length);
}
}