Stereo → 5.1 Surround Upmixer

Pro Logic II matrix · Frequency crossover separation · Per-channel leveling · 6-ch WAV export

Pro Logic II Matrix Frequency Crossover 6-ch WAV Export LFE <80Hz Haas Surround Delay 100% Browser

🎷

Drop stereo audio file or click to upload

MP3, WAV, OGG, AAC, FLAC, M4A — Stereo input required

📁 File—

⏱ Duration—

🎘 Sample Rate—

🔊 Channels—

📈 Input Waveform

🧮 Upmix Matrix Algorithm

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 6-channel interleaved WAV (FL, FR, FC, LFE, RL, RR — standard 5.1 order). Compatible with VLC, DaVinci Resolve, Adobe Premiere, Audacity, and most DAWs.

Channels: 6 (5.1) | Bit depth: 24-bit PCM | Format: WAV

🔊 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