Audio · speaker test
Speaker Test: Left/Right Channels, Bass and Phase
This speaker test plays sound to the left and right speaker separately to check they're connected the right way round, steps through bass tones from 20 Hz to 200 Hz to show how low your speakers really go, and runs an A/B phase check that catches a speaker wired backwards (+ and − swapped). Each part ends with a verdict and the fix. It works with desktop speakers, soundbars, laptop and phone speakers, starts at a safe volume, and runs in your browser.
How the speaker test works
- Step 1
Set a safe volume
Turn your system volume down, then raise the test-volume slider until the beeps are clear.
- Step 2
Channels, bass, phase
Play left and right separately, step up through the bass tones, then compare samples A and B.
- Step 3
Fix what's wrong
Swapped or silent channels, weak bass and reversed wiring each come with a specific fix.
How low should your speakers go?
| Lowest tone you can hear | Bass | Typical for |
|---|---|---|
| 35 Hz or lower | Deep bass | Subwoofers, good over-ear headphones and in-ear monitors with a seal |
| 36–60 Hz | Good bass | Bookshelf speakers, most decent headphones and earbuds |
| 61–100 Hz | Typical small-speaker bass | Small desktop speakers, soundbars without a sub, loose-fitting earbuds |
| Above 100 Hz, or none | Limited bass | Laptop and phone speakers, monitor speakers |
Left and right channel results
| Result | What happened | Fix |
|---|---|---|
| Left and right are correct | Each channel played only from its own side. | Nothing to fix. |
| Left and right are swapped | Sound meant for the left came out on the right, and vice versa. | Check you're wearing headphones the right way round (look for L/R marks). For speakers, swap the cables. Also check Windows/macOS sound settings for a swap or balance option. |
| Left channel is silent | Nothing (or the wrong side) played when only the left channel was sent. | Check the balance slider in your system sound settings, reseat the plug or cable, and try another device. If one earbud or speaker stays silent everywhere, it's likely a hardware fault. |
| Right channel is silent | Nothing (or the wrong side) played when only the right channel was sent. | Check the balance slider in your system sound settings, reseat the plug or cable, and try another device. If one earbud or speaker stays silent everywhere, it's likely a hardware fault. |
| Playing in mono | Both channels came out of both sides, so stereo separation is lost. | Turn off 'Mono audio' in accessibility settings (Windows: Settings › Accessibility › Audio; macOS: System Settings › Accessibility › Audio; iOS/Android have the same switch). Bluetooth headsets in hands-free/call mode are also mono. |
| No sound at all | Neither channel was heard. | Unmute and raise the volume, check the correct output device is selected, and make sure the browser tab isn't muted. |
What this test can and can't tell you
Reliable: Wiring and channel order. One channel at a time is a definitive check that left and right are connected correctly and both work.
Estimate: Bass depends on the room. Placement near walls and corners boosts bass, and the room adds peaks and dips. Your result describes your setup, not the speaker alone.
Limit: No measurements without a microphone. Frequency response and distortion need a measurement microphone; this test is a by-ear functional check.
Speaker Test — frequently asked questions
- How do I test my speakers' left and right channels?
- Play a sound to the left channel only, then to the right channel only, and check each comes from the matching speaker. If they're reversed, swap the speaker cables (or the L/R plugs); if one is silent, check the cable, the balance setting and the amplifier.
- How do I test speaker bass?
- Play pure tones from low to high — 20, 30, 40, 50 Hz and up — at a moderate volume and note the lowest one you clearly hear. Bookshelf speakers typically reach 40–60 Hz, small desktop speakers 70–100 Hz, and laptop speakers often nothing below 150 Hz. A subwoofer is what reaches 20–35 Hz.
- What does it mean if my speakers are out of phase?
- One speaker's + and − wires are swapped, so the two cones move in opposite directions. Bass cancels out and the sound loses its centre image. Check that the red (+) and black (−) wires match on both speakers and on the amplifier.
- Why does my speaker crackle on the low tones?
- Small speakers can't move enough air for deep bass, so at higher volume the cone hits its limits and buzzes. Lower the volume; if it crackles at moderate volume on tones it should handle, the driver may be damaged.
- Can I test laptop or phone speakers?
- Yes. Expect limited bass (often nothing below 150–200 Hz) and that many phones and laptops mix to mono or place both speakers close together, which makes the phase test hard to hear.
Sources
- StereoPannerNode — MDN Web Docs
- OscillatorNode — MDN Web Docs
Last reviewed .