Online Speaker Test: Stereo, Sweep, Noise, Phase

Overview

Use our online speaker test to verify left/right channels, check frequency response with a sweep, listen to pink/white/brown noise, and run phase checks—all generated locally in your browser using the Web Audio API.

No downloads, no sign‑in, and no recordings leave your device. This tool is ideal for quickly checking new speakers, soundbars, headphones, or routing to Bluetooth/USB audio.

Quick start

1. Connect your speakers or headphones and set your system volume to a safe level.
2. Choose the output device (if supported) from the Speaker menu at the top of the app.
3. Click Left and Right to confirm stereo channels and balance.
4. Run the 20 Hz → 20 kHz sweep and listen for even loudness without rattles or buzzes.
5. Try White/Pink/Brown noise for fine balance and tone checks. Adjust the Master Volume as needed.

Using the features

Stereo: Left / Right / Alternate

Plays short beeps panned to the left or right channel. Use Alternate to cycle between channels automatically. Great for confirming proper wiring and balance.

Frequency sweep

A smooth sine sweep from low bass to high treble. Listen for holes, peaks, rattles, or cabinet buzz. In small rooms, expect some variation due to room modes.

Tone generator

Generate a continuous sine/square/saw/triangle tone at any frequency. Useful for identifying resonances or isolating problem bands on your system.

Noise: White / Pink / Brown

White noise is equal energy per Hz (bright); pink noise is equal energy per octave (balanced for listening tests); brown noise emphasizes low frequencies (use with care at high volumes).

Phase: In‑phase vs Out‑of‑phase

In‑phase should sound centered and full; out‑of‑phase should sound diffuse and thin. If out‑of‑phase sounds stronger, check speaker wiring or polarity settings.

Visuals: Spectrum and Waveform

The live analyzer shows either a frequency spectrum or a time‑domain waveform of the generated signal. Use it to verify that audio is flowing and to observe tonal changes.

Advanced tests

• Balance check: Play pink noise, set both speakers equal distance, and adjust balance so the image is centered.
• Subwoofer integration: Sweep up from 20–120 Hz and listen for a smooth handoff to your mains (try different crossover settings).
• Stereo imaging: Use the tone at 440–1000 Hz and toggle phase; good setups produce a tight phantom center in‑phase and a diffuse image out‑of‑phase.
• Room issues: If certain sweep bands are much louder/quieter, try moving speakers/listening position or adding acoustic treatment.
• Headphones: Use Left/Right beeps to confirm orientation; sweeps help detect channel imbalances or driver issues.

Improving sound quality

Setup and positioning

• Form an equilateral triangle between your ears and the speakers; tweeters roughly at ear height.
• Start with speakers 0.5–1 m from walls; adjust toe‑in to taste for clarity vs. soundstage width.
• Avoid placing speakers on resonant surfaces; use solid stands or isolation pads.
• For soundbars/TVs, disable virtual surround features during testing to get a clean baseline.

System and levels

• Keep system volume at safe levels; start low—sweeps and tones can get loud quickly at certain frequencies.
• If your device has EQ or room correction, run tests before and after to compare the effect.
• Use pink noise to match speaker levels by ear; for precision, consider an SPL meter later on.

Troubleshooting

I hear nothing

Set your system volume up slightly, check the Master Volume slider, ensure the correct output device is selected, and try another browser tab/app to confirm your system output works. If using Bluetooth, make sure it is connected as an audio output (A2DP).

Can’t pick a device

Selecting a specific output requires browser support for “setSinkId.” Chrome‑based browsers usually support it on desktop; Safari/Firefox may not. When unavailable, audio plays through the system default device.

Clicks or pops when starting/stopping

Short clicks can occur when starting/stopping oscillators. We ramp gains to minimize this, but very low‑latency devices may still produce minor transients. Lower the volume slightly if needed.

Distortion at certain frequencies

Reduce volume; small speakers and soundbars can struggle with deep bass. If distortion persists at moderate levels, it may indicate a hardware limitation or loose panels.

Privacy

All signals are generated locally in your browser. We do not record or upload your audio. Device selection happens on your machine, and no output from your speakers is captured by this site.

FAQ

Glossary

Frequency

The number of cycles per second of a sound, measured in Hertz (Hz). Low frequencies are bass; high frequencies are treble.

Sine wave

A pure tone containing only a single frequency—useful for spotting resonances and rattles.

Sweep

A tone that moves through a range of frequencies over time; helpful to hear response across the spectrum.

Pink noise

Noise with equal energy per octave; perceived as more balanced than white noise for listening tests.

Brown noise

Noise with more low‑frequency energy; useful for low‑end checks but use cautiously at higher volumes.

Phase

The relative timing between left and right channels. Incorrect polarity can thin out bass and shift the stereo image.

Stereo image

The perceived placement of sounds between speakers—center focus, width, and depth.

SPL (Sound Pressure Level)

A measure of loudness, typically in dB. Excessive SPL can damage hearing and equipment.

Clipping

Distortion that occurs when an amplifier or driver is pushed beyond its limits. Reduce volume immediately if you hear it.