Audio → 5.1 Surround Tool
Auto-detects stereo or native 5.1 · Per-channel leveling · 16-bit 6-ch WAV export
Auto 5.1 Detection
Stereo Upmix
16-bit 6-ch WAV
LFE <80Hz
Haas Surround Delay
100% Browser
🎷
Drop stereo or 5.1 audio file or click to upload
MP3, WAV, OGG, AAC, FLAC, M4A — stereo files are upmixed, native 5.1 files are preserved
📁 File—
⏱ Duration—
🎘 Sample Rate—
🔊 Channels—
📈 Input Waveform
🧮 Auto Processing
Pro Logic II — Full-band stereo matrix. Center = (L+R)×0.707. LFE = lowpass(L+R, 80Hz). Surrounds = phase-shifted difference (L−R) with Haas delay 15ms. Best for music & movies.
🎘️ Frequency Crossover
LFE Cutoff (Sub) 80 Hz
Center High-Cut 8000 Hz
Center Low-Cut 200 Hz
Surround High-Cut 7000 Hz
Surround Low-Cut 200 Hz
Haas Delay (ms) 15 ms
📦 Export 5.1 Audio
Exports a real 6-channel 16-bit PCM WAV (FL, FR, FC, LFE, RL, RR — standard 5.1 order). Native 5.1 uploads are preserved; stereo uploads are upmixed. Compatible with VLC, DaVinci Resolve, Adobe Premiere, Audacity, and most DAWs. WAV is uncompressed, so it can be much larger than MP3.
Estimated download size: Upload a file to calculate size
🔊 Live Speaker Theater
🎘️ Channel Mixer
📡 Signal Flow
FL ← Left Channel (HPF >80Hz)
FR ← Right Channel (HPF >80Hz)
C ← (L+R)×0.707 bandpass
LFE← (L+R) lowpass <80Hz
LS ← (L−R) phase+Haas delay
RS ← (R−L) phase+Haas delay
Matrix Coefficients