Speaker Frequency Response

Curious whether your speaker is bass-heavy, bright, or actually balanced? Speaker Frequency Response plays a sweep tone through your speaker or headphones and measures how it actually sounds using your phone's microphone — then shows you a relative frequency response curve.

[ HOW IT WORKS ]

● Play a Sweep

Tap Start Measurement and the app plays a tone that sweeps from 20Hz to 20kHz through your speaker or headphones.

● Listen and Analyze

While the sweep plays, your phone's microphone captures the sound and analyzes it in real time using FFT (fast Fourier transform) — the same signal analysis audio engineers use.

● Read the Curve

You get a relative response curve (0dB = your speaker's own average, not an absolute loudness standard) plus a plain-language verdict: bass-heavy, treble-heavy, mid-heavy, or balanced — along with where the low and high end start rolling off.

● Save and Compare

Name and save measurements so you can compare speakers, headphones, or rooms side by side.

[ FEATURES ]

- Automatic microphone-based frequency sweep measurement

- Relative response curve, 20Hz–20kHz

- Plain-language balance verdict with rolloff points

- Background noise and clipping warnings — know when to remeasure

- Save and compare multiple measurements

- Adjustable sweep duration

- Light, dark, and system themes

[ IMPORTANT NOTES ]

This app measures relative frequency response, not absolute SPL or dB — your phone's microphone is not a calibrated measurement mic, so results are best used for comparing speakers or headphones to each other, not as lab-grade specs. It's built for external speakers and headphones; a phone's own built-in speaker is too close to the mic to measure meaningfully. Measure in a quiet room, about 30cm from the speaker, for the most reliable curve.

Find out what your speaker actually sounds like.