Controlled signal
The tool generates the test inside your browser with a bounded app-level gain. Your operating-system and hardware volume remain separate.
Online Speaker Test
Use controlled tones to verify that both speakers are connected, placed correctly and playing cleanly. Confirm each observation so the diagnostic result reflects the room and hardware you actually hear.
Confirm selected signal
The spoken instruction is centered. The tone that follows is the directional test signal. Only your confirmation determines the result.
Local by default
Output tests do not upload audio. Microphone tools request permission only when started and explicitly state what stays in memory.
SCOPE / 01
What this test checks
This test routes a controlled signal to each browser audio channel. Your observations can confirm physical left-right placement, reveal obvious level differences and help locate a rattle that repeats at the same frequency.
- Setting up desktop speakers, studio monitors, a soundbar or a Bluetooth speaker.
- Sound is missing, reversed, unbalanced or distorted and you need a repeatable reference signal.
- Whether the physical speakers follow the browser's left and right routing.
- Whether both sides produce a centered signal at the same app level.
- Whether buzz, breakup or mechanical rattle repeats with a controlled tone.
- Acoustic frequency response or calibrated sound pressure in the room.
- Which component failed without changing one cable, source or speaker at a time.
PROCEDURE / 02
How to run this test
Keep the level moderate and change one thing at a time so the result remains useful.
- 01
Lower the system and speaker volume before starting.
- 02
Play left and right signals and identify the physical speaker.
- 03
Listen for equal level, buzz, rattling or breakup.
- 04
Run the bass check at moderate volume and retest after any fix.
INTERPRETATION / 03
What your result means
Match what you heard or saw, change one variable, then use the linked check to verify the result.
| Observation | Likely cause | Next step | Retest |
|---|---|---|---|
| 01Neither channel is audible although the test is running. | The browser may be muted or routed to a monitor, dock, disconnected Bluetooth device or inactive interface output. | Check the tab, app mixer, system output, speaker power and hardware mute before changing audio drivers. | Follow the no-sound checks |
| 02The left signal comes from the right speaker, and vice versa. | Physical placement, analog cables or an interface routing matrix is reversed. | Swap the speaker positions or correct the channel mapping, then run the directional test again. | Retest left and right |
| 03One speaker is silent or consistently quieter. | Balance settings, cabling, per-channel amplifier gain or a speaker fault can create a persistent difference. | Swap left and right connections at one point in the chain and see whether the fault moves with the cable or speaker. | Diagnose one side |
| 04A buzz or rattle appears at a repeatable pitch. | A cabinet, desk, port or nearby object may be resonating; heavy EQ or excessive level can also cause breakup. | Lower the level, bypass EQ and use a single-frequency tone to locate the narrowest repeatable range. | Locate the problem frequency |
VARIABLES / 04
Why results can vary
The generated signal stays controlled; the physical device, room and system path can still change what reaches you.
Listening position
Sitting closer to one speaker or away from the center line can make equal electrical levels sound unbalanced.
Room reflections
Walls, desks and corners reinforce or cancel different frequencies, especially through speakers rather than headphones.
Mechanical resonance
Loose cabinet parts and objects near the speaker can rattle even when the driver itself is working normally.
Output mapping
Docks, monitors, interfaces and Bluetooth devices can become the active output without changing the browser page.
LIMITS / 05
Browser limits and safety
Online Speaker Test questions
Why do both signals come from both speakers?
Mono mode, accessibility settings, an adapter or the speaker electronics may be combining the channels.
Can I test a Bluetooth speaker?
Yes. Select it as the operating-system output first, then compare delay and quality with a wired path if possible.
What volume should I use?
Start low, then raise volume only until the signal is comfortably audible and free from background noise.