Stereo Channel Separation, Left/Right Balance & Phase Alignment Testing
Left/Right Stereo Channel & Phase Tester allows sound engineers, audiophiles, and studio producers to diagnose headphone wiring, studio monitor placement, channel crossover, and phase cancellation issues. It generates isolated left/right acoustic sweeps, pink noise bursts, centered monophonic test tones, and out-of-phase anti-phase sine waves to reveal inverted speaker polarities and acoustic room nulls.
Listening on miswired headphones or monitors with reversed polarity destroys the stereo imaging, collapses the center vocal phantom image, and causes severe low-end bass loss. This diagnostic tool executes 100% in-browser via Web Audio stereopanners and spatial gain matrices with zero latency.
计算公式与底层原理推导
Phase Inversion: \text{Out}_{\text{left}}(t) = A \sin(2\pi f t) ; \text{Out}_{\text{right}}(t) = A \sin(2\pi f t + \pi) = -A \sin(2\pi f t)
Directs isolated audio oscillator channels through ChannelSplitter and ChannelMerger nodes, flipping phase polarities by 180 degrees to test constructive and destructive acoustic interference.
最佳实践与工程实战指南
- Identify 180-Degree Polarity Inversion Through Center Bass Cancellation: When listening to the out-of-phase test tone, a properly wired stereo setup should make sound appear diffuse, hollow, and detached from the center with vanishing bass response. If out-of-phase sounds focused, your speaker wires are inverted.
- Check Headphone Left/Right Physical Orientation: Run the isolated Left Channel sweep to confirm that sound originates exclusively from your left ear cup. Reversed headphone cans are common in budget headsets and misconfigured DAW monitor routing.
- Calibrate Studio Monitor Equilateral Triangle Geometry: Position your left and right studio monitors so they form an exact equilateral triangle with your listening position, angling tweeters directly toward ear level to establish a razor-sharp phantom center image.
- Use Correlated Pink Noise to Detect Room Standing Wave Anomalies: Play mono pink noise across both speakers; walk across your studio room to listen for frequency nulls or resonant boomy bass buildup caused by unpadded boundary reflections.