8D Audio Converter

8D audio makes a song seem to travel slowly around your head: in front, to the right, behind and to the left. This converter does it with the same head-related filtering that 3D games and virtual-reality audio use, plus a little reverb. You can also pan the sound left and right for speakers, or place it in one fixed direction. Put on headphones, choose a song and listen. Nothing is uploaded.

How to use this tool

1. Choose one or more songs.
2. Keep the 8D effect and a turn time of about 8 seconds, or choose auto-pan or a fixed 3D position.
3. Set the reverb (around 20%) and press Calculate.
4. Listen with headphones and download the MP3 or WAV.

Formula

Position at time t: x = sin(2πt ÷ T), z = −cos(2πt ÷ T) (a circle of radius 1 around the listener) · auto-pan: pan = width × sin(2πt ÷ T)

T is the time for one turn. For 8D and 3D the song is mixed to mono and played through a Web Audio PannerNode with the HRTF model, which filters the sound the way your head and ears would for that direction; the distance stays fixed, so only the direction changes. Auto-pan keeps the stereo mix and moves it with an equal-power stereo panner. The reverb is a convolution with a short generated room response (1.6 s), mixed at √reverb with √(1 − reverb) of the direct sound. The result is lowered if it would peak above −1 dBFS.

Example

With a turn time of 8 s, a 3:30 song (210 s) circles your head 210 ÷ 8 ≈ 26 times. At t = 2 s the sound is at 90° (fully right), at 4 s behind you, at 6 s on the left. With 20% reverb, 1.6 s of room tail is added at the end.