Speaker & Headphone Test Online – Left/Right Stereo & Bass Check
Test your laptop speakers, desktop monitors, earphones, or Bluetooth headphones online. Check Left and Right stereo channel separation, test subwoofer bass depth, run an audio frequency sweep from 40Hz to 12kHz, and diagnose sound distortion before gaming, listening to music, or joining online meetings.
Sound Frequency & Bass Test
Test whether your headphones or laptop speakers can clearly reproduce deep bass, vocal mid-tones, and crisp high frequencies.
Custom Tone Generator
1. Left Test: Sound should only play from your left ear. If you hear it in both, your device is in Mono mode.
2. Right Test: Sound should only play from your right ear.
3. Bass Test: Low 60Hz hum should sound smooth with zero crackling or rattling.
100% In-Browser Audio: All sound frequencies and stereo panning are generated directly by your browser's audio synthesizer.
Left & Right Stereo Test
Dedicated left and right channel audio panner to verify true stereo separation.
Sub-Bass & Frequency Tones
60Hz deep bass, 1000Hz reference vocal, and continuous frequency sweeps.
100% In-Browser Audio
Synthesized locally via HTML5 Web Audio API. Zero bandwidth or download needed.
How to Fix Speaker or Headphone Issues on Windows, Mac, and Mobile
1. Click the Speaker icon on your taskbar and check that the volume is not muted.
2. Go to Settings > Sound > Output, click your device, and ensure the Left/Right balance sliders are equal.
3. Turn off Audio Enhancements if you hear crackling or buzzing sounds.
1. Check if Bluetooth is accidentally connected to another speaker in another room.
2. Check physical volume buttons on the side of your device.
3. On iPhone: Settings > Accessibility > Audio/Visual > ensure Balance slider is centered.
Popular Paired Tools
Frequently Asked Questions (FAQs)
How do I test if my Left and Right headphones are working properly?
Put your headphones or earphones on. Click the "Test Left" button to play sound exclusively in the left earcup, and click "Test Right" to play sound in the right earcup. If sound plays from both sides during the Left test, your audio output is set to Mono instead of Stereo.
What should I do if one side of my headphones has no sound?
First, check the 3.5mm headphone jack or USB-C plug to make sure it is pushed completely into the socket. Next, check the "Stereo Balance" slider above to ensure balance is centered at 0. On Windows, check Settings > System > Sound and verify Left/Right balance is equal.
What is the Sub-Bass and Frequency Sweep test?
Human ears can typically hear sounds from 20 Hz (very deep bass) up to 20,000 Hz (high-pitched treble). Our Sub-Bass (60Hz) test checks if your speakers can deliver deep rumble without distortion or crackling. The Frequency Sweep smoothly sweeps from 40 Hz to 12,000 Hz to reveal any dips or distortion in your audio hardware.
Why does the sound play in both ears during the Left test?
This happens if "Mono Audio" is enabled in your operating system accessibility settings. On Windows, go to Settings > Accessibility > Audio > Turn off "Mono audio". On iPhone / iPad, go to Settings > Accessibility > Audio & Visual > Turn off "Mono Audio".
Can I test external Bluetooth speakers or soundbars?
Yes! Connect your Bluetooth speaker or soundbar to your device, select it as the active audio output in your system tray, and press the test buttons above.