Headphone Tester Pro

What Can Headphone Tester Pro Do

Ordinary headphone testers just play some sounds for you to "listen" to; the professional version uses a microphone loop for objective measurement, turning "something feels off" into "measurable data". It runs in your browser with no installation required. Core features include:

• Frequency Response Sweep Curve: Auto-plays 20 Hz–20 kHz logarithmic sweep, microphone captures simultaneously, plots relative frequency response curve, provides flatness (±dB) and the frequency of deepest dip, helping you spot at a glance if any frequency band is missing or collapsed.
• Channel Balance & Phase: Measures left/right channel levels (dBFS) separately and calculates channel difference, simultaneously detects if left/right polarity is consistent (normal / suspected reversed polarity)—one test reveals reversed connections or cold solder joints.
• Total Harmonic Distortion (THD): Plays pure tones, captures fundamental and harmonic frequencies, calculates THD percentage—lower values mean cleaner sound.
• Test Records & Export: Each measurement is automatically saved, can export CSV/JSON reports, suitable for quality control documentation, used headphone verification, and comparative reviews.

How to Use

Put on or position your headphones, place your device's microphone close to the ear cup, and operate in a quiet environment:

1. Frequency Response Sweep: Click "Start Sweep", after hearing a sweep from low to high, the frequency response curve, flatness, and deepest dip appear on the right.
2. Channel & Phase: Click "Start Test", the tool measures left/right channel levels sequentially and compares phase, provides channel difference and "normal/suspected reversed polarity".
3. THD Distortion: Select a frequency (e.g., 1 kHz) and click start, get the THD% and real-time spectrum at that frequency.
4. View Records: In "Test Records" you can review history and export CSV/JSON.

How to Interpret Results

• Frequency Response Curve: The flatter the better; a pronounced dip in any frequency band indicates weakness in that band (possibly driver aging or poor seal).
• Channel Difference: Within 1.5 dB you can barely hear it; larger differences mean imbalance, check fit, connectors, cables, or drivers.
• Phase "Suspected Reversed Polarity": Thin bass and blurry soundstage, usually caused by reversed cable polarity.
• THD: Excellent if under 1%, acceptable at 1%–5%, obvious distortion if higher.

Important Notes & Limitations

This tool performs relative measurement using your device's microphone; the microphone is uncalibrated and not equivalent to lab-grade absolute frequency response. It excels at detecting "defects, deviations, and changes" (channel difference, phase reversal, frequency dips, before-and-after burn-in comparison), not providing absolute sound pressure levels or certified curves. Built-in phone/laptop microphones have limited precision; we recommend a quiet environment with the microphone close to the ear cup, and comparing with a known-good headphone if needed.

Frequently Asked Questions

Why place the microphone close to the ear cup?
Headphone sound must travel through air into the microphone to be measured; the closer the microphone and the quieter the environment, the more accurate the curve.

What can I use the exported report for?
CSV/JSON contains key metrics and curve data from each measurement, useful for quality control records, used headphone transaction verification, or comparing multiple headphone pairs.

Do you support Bluetooth headphones?
Yes, but Bluetooth latency and DSP processing can affect measurement stability; wired headphones are preferred, or disable "audio enhancement" on Bluetooth headphones.