Which Side Fired First?

1. 0:04 · A leads on the left by 3.5 milliseconds.
2. 0:07 · B reverses the order. The right leads by the same amount.
3. 0:21 · The gap is 48 milliseconds. Listen for the second hit.

Both virtual sources play the same original sound at equal levels. With a short gap, the first arrival can pull the apparent location towards its side. What you hear depends on your headphones and how you perceive the sound. When folded to mono, A and B have the same waveform, so the left–right effect needs stereo.