AUDIO PHASE TESTER
Test Left/Right isolation and Phase (Polarity) integrity.
The Science of Audio Phase & Polarity
In sound engineering, Phase refers to the position of a point in time on a waveform cycle. Scientifically, if two speakers are "In Phase," their diaphragms move forward and backward simultaneously, reinforcing the sound pressure. If they are "Out of Phase," one moves forward while the other moves backward, causing Destructive Interference. Our tool uses the Web Audio API GainNode with a negative value (-1) to invert the phase of the right channel. This allows you to hear the difference: In-Phase sound should feel solid and centered, while Out-of-Phase sound feels hollow and physically disorienting. In 2026, maintaining Phase Coherence is vital for high-fidelity audio reproduction and accurate soundstage imaging.
Phase Alignment Metrics
How to use the tool
1. Isolation Test: Use 'Left Only' and 'Right Only' to confirm each speaker is on the correct side.
2. Center Image: Click 'In Phase'. The sound should appear to come from directly in front of you (between the speakers).
3. Polarity Check: Click 'Out of Phase'. If the sound becomes hollow and "wider" than your speakers, your system is correctly wired. If 'In Phase' sounds hollow, you have a polarity issue.
Questions and Answers (Q&A)
The most common cause is swapping the positive (+) and negative (-) wires on one speaker. This can also happen internally in some low-quality headphones or due to incorrect software DSP settings.
Legal Disclaimer & Advice
Please consult with a professional audio technician if you identify a phase reversal that you cannot fix via wiring. Listening to out-of-phase audio for extended periods can cause listening fatigue and headaches. Use safe volume levels during all tests.