Online Sound Test: Check Your Speakers and Stereo Audio

Overview

The Sound Test plays a tone through your speakers or headphones so you can confirm both channels are working correctly. Pick Left, Right, or Both, set your volume and frequency (220Hz, 440Hz, or 880Hz), then press play and listen for a clean tone on the channel you selected. Use the free headphone sound test whenever you want a fast, repeatable way to confirm this.

Your speakers, headphones or earbuds can look connected and still play nothing, play one side only, or lose the bass. This stereo sound test sends short tones through each channel so you hear the answer in seconds, before a Zoom call, a game or a music session, with a clear yes or no on your audio path.

How the Online Sound Test Checks Your Speakers

Each button sends a short signal to one channel of your audio output. If that side plays it cleanly, every link works: page, browser, operating system, cable and cone. If it stays silent, the break sits somewhere along that path.

Run a Quick Sound Test First

Set your system volume to roughly 30%, then press left, right and center. A good result is a test tone that is clearly audible on the matching side only, with no buzz. Raise the level gradually rather than jumping to maximum. This sound tester stores nothing and needs no install.

What the Web Audio API Does in Your Browser

The tones are generated live by the Web Audio API, built into Chrome, Firefox, Safari and Edge. It renders at your device's sample rate, usually 44.1 or 48 kHz, and hands the samples to your sound card, so the result reflects your actual hardware, not a compressed recording.

Reading a Stereo Test: Left, Right and Center

Stereophonic sound uses two independent audio channels to place voices and instruments between your speakers. A center signal should seem to come from the middle; left and right signals only from their own side. When one channel is missing, the stereo image collapses to one side.

Left Speaker or Right Speaker?

If the left button plays from the right side, the channels are swapped. On color-coded connectors, red marks the right channel, so check that plug first, then the speaker connections and any audio cables in between. If one side is quieter, check the balance slider: stereo panning set off-center by accident ruins channel balance. On headphones, wiggle the 3.5mm jack during playback to spot a loose contact.

Relative Polarity and Phase

Both sides can play and still be wired wrong. Press center: if the signal seems diffuse and thin in the bass instead of sitting in the middle, one unit's plus and minus leads are probably reversed and the pair is out of phase. Swap one side's leads and press center again: correct polarity gives a firm, centered image.

Frequency Response in a Full Audio Check

A channel test tells you whether each side works; a full audio check tells you how well. Frequency response is how evenly your audio equipment reproduces deep bass through treble, measured in hertz (Hz). Full-bandwidth monitors stay fairly flat, while small cones roll off early.

Frequency Sweep From 20Hz to 20kHz

A frequency sweep glides one sweep tone from 20Hz to 20kHz, the nominal limits of the human hearing range, so you can note where your system starts and fades. That span covers about ten doublings, since each octave doubles the pitch. Keep a steady sound level and listen for distortion, rattling panels or dead spots. In our example, laptop speakers only became audible near 180Hz, a desk pair at 55Hz, and the pair with a subwoofer at 28Hz. Most adults lose the high frequencies first, so a top end that vanishes around 16kHz may be your ears.

Pink Noise, Peaks and Dips

Pink noise carries equal energy in every octave, so a flat sound system makes it hiss evenly; a band that booms or drops out points to resonances. If your sweep swells at one pitch, blame the listening room's axial modes:

$$f_n = \frac{n \times 343}{2L}$$

Here 343 is the speed of pressure waves in air (m/s), \(L\) is the dimension in meters and \(n\) is 1, 2 or 3. For a 4.6 × 3.4 × 2.5 m space:

Modes at 68.6 and 74.6, only 6Hz apart, stack into a bass bump near 70Hz, while the gap between 37.3 and 50.4 leaves thinner dips. If a sweep swells near 70Hz, move your seat or the subwoofer before reaching for an equalizer. Both test signals reveal it; the sweep pinpoints the pitch.

Chasing a Voice Boom in a Spare Bedroom With the Sound Tester

I am setting up a podcast edit desk in a 3.62 × 3.05 × 2.41 m spare bedroom, and one guest's voice keeps blooming on certain syllables. Is it the recording, the monitors or the space? It turns out to be the space, and exactly where my head sits in it: two modes at 142.1Hz and 142.3Hz both peak at my chair.

First, the channel check: left, right and center each land where they should, and reversing the leads on the left monitor makes the center image worse, so the wiring is correct. Next, a slow sweep at a fixed level. Between roughly 138 and 146Hz the level swells clearly, then settles. That band sits squarely inside a male speaking voice, which explains the bloom.

The sweep gives me the pitch; the axial-mode formula from above tells me why, using \(f_n = n \times 343 / 2L\):

• Length, 3rd mode: 3 × 343 ÷ 7.24 = 142.1Hz
• Height, 2nd mode: 2 × 343 ÷ 4.82 = 142.3Hz

The 2nd height mode is loudest at floor, ceiling and mid-height, 1.21 m, which is almost exactly my seated ear height. The 3rd length mode is loudest every 1.21 m from the front wall, and my chair is at 2.41 m. Both maxima stack on my ears, which is exactly what the sweep heard. Moving the chair changes only the length mode, so I check how far it falls off:

My decision: move the desk so the chair sits at 1.81 m, leaving only the height mode at my ears. Rerunning the sweep from there, the 138 to 146Hz swell shrinks to a mild lift, which is the height mode the table predicted would remain. Position is the input that matters most here; the monitors were never the problem, and new ones would boom at the same pitch. The caveat: a sweep only describes the seat you hear it from, so a result taken standing behind the desk can miss a boom that is obvious once you sit down. Always run the sweep from your real listening position.

No Sound? Fixing a Failed Speaker Test

Silence on both channels usually means the signal never reached the amplifier. Work from the simplest cause down.

Check the Playback Device and Volume

• Confirm the speakers are powered and plugged into the green jack, not the pink microphone input.
• In your operating system's settings, pick the correct playback device; HDMI monitors and Bluetooth headsets often take over as the default output device.
• Make sure neither the system mixer nor this browser tab is muted.

Update the Audio Driver

If every setting looks right and the tones still fail, reinstall the audio driver from the laptop or motherboard maker's support page and restart. Outdated drivers can also cause crackles that pass for a failing unit.

Which Audio Test to Run Next

Once both channels pass, pick a headphone test for over-ear and in-ear sets, or a hearing check if you suspect the limit is your ears.

Bass Test and Subwoofer Setup

A bass test plays low frequency tones one at a time to find the lowest note your audio system reproduces. Check any bass boost or equalizer preset, and turn the volume down first, because many test files are recorded at full scale. On a sub with a 0/180 switch, flip it while a tone plays and keep the louder setting.

Surround Sound in 5.1 and 7.1

Multichannel layouts add center, side, rear and LFE channels. Play each in turn and confirm it comes from the position named; swapped rear pairs are common.

Tone Generator and Hearing Test

A tone generator gives you a steady reference pitch, such as A4 at 440Hz, for tuning or hunting a rattle at one frequency. A spectrum analyzer uses FFT to show the frequencies present in real time, handy when a hum hides under music. A hearing test plays quiet tones band by band; treat it as a screening, not a diagnosis. Binaural beats need an over-ear or in-ear set, since each ear must hear a different pitch.