Use a desktop or notebook computer Speaker System Check is designed for a computer connected to the speaker system. A computer makes it easier to confirm the output connection, channel direction, and polarity without relying on the phone speaker or wireless routing. If your phone is connected to the correct external output, you can still continue.

Ready

Read the guide first. Then use the play buttons in this test.

Audio is not available

This browser does not support the Web Audio API.

Playing: {label}

This signal keeps playing until you change modes or press the stop button.

Listen for a small and clear point between the speakers. It should not spread wide or lean to one side.

Use this as a second check for wide-band mono balance after the center focus signal.

Playing: {side} channel

The automatic left and right check is running. The signal should alternate between the correct speakers.

This mode should usually sound the most focused and solid.

If this reversed mode sounds best, follow the guide below and run the test again.

Playing: normal mode

The automatic comparison is running through the normal mode and the two reversed modes.

Listen for the most focused center image and the strongest low-mid body.

Speaker Match

Playing: {side} speaker, {band} band

Change the band or speed during playback to locate level or tone differences.

The band changed during playback. Keep listening while the signal alternates left and right.

Selected band: {band}. Press the start button to compare left and right.

Speaker Match speed: {speed}

The left and right comparison continues with the new speed.

Speed set to {speed}. Press the start button to compare left and right.

Rattle & Buzz Check

Sweep speed set to {speed}.

Playing: low sweep

Use the hold button only when you need a continuous tone. Then use the frequency buttons to move around that frequency.

Holding frequency

Move up or down around this frequency, or press the release button to continue the sweep.

The sweep is moving again. Use the hold button when you hear a buzz or rattle.

Adjusted to {freq} Hz. Keep moving up or down to locate the noise.

Current mode: Select a mode

Current mode: {mode}

Start with the normal setting. Then try the two reversed settings. Use the most focused center image as the reference.

This setting sounds focused and solid. The two speakers are likely in correct relative polarity.

This reversed setting sounds best. Check the left speaker wiring first. Then run the normal test again.

This reversed setting sounds best. Check the right speaker wiring first. Then run the normal test again.

POLARITY · STEREO SETUP · MONO CENTER

Speaker System Check

Use these guided signals to check speaker polarity. You can also check the left and right channels, the sound in the center, speaker matching, and low-frequency rattles. Signal View shows the signal that the browser sends. It does not measure sound in your room.

Quick Troubleshooting Guide Read before testing
Channel & Mono CenterRun the channel test first. Then use the focus signal to check the center image.

The focus signal should appear as a small point between the speakers. Check level, distance, angle, and room symmetry if the image drifts or spreads wide.

PolarityUse the normal mode as the reference. It should sound solid and centered.

If a reversed mode sounds clearer or stronger, check the wiring and polarity settings for that side. Then run the test again.

Speaker Match & RattleCompare frequency bands first. Then run a low-frequency sweep to find buzzes or loose parts.

Use the band buttons to find the range where the speakers sound different. Hold the problem frequency and check grilles, screws, shelves, cables, and nearby objects.

Signal View

Channel Check

Signal: continuous pink noise · Output: selected channel
LEFT
LISTENER
RIGHT
L
R
631252505001k2k4k8k

This view shows the test signal being sent by the browser. It is not a microphone measurement of your speakers or room.

Volume25%
Ready Read the guide first. Then use the play buttons in this test.

Basic Wiring

Channel Check

Check that the left and right outputs are connected to the correct speakers before you run deeper tests.

Signal: continuous pink noise · selected channel
Auto
Manual

Steps

Start with the automatic left and right check. Use the manual buttons only when you need to confirm one side. The signal keeps playing until you change modes or press the stop button.

Expected sound

The left speaker should play when the left side is selected. The right speaker should play when the right side is selected.

If the result seems wrong

Check the signal routing if the channels are swapped, silent, or playing from both speakers at once. Do this before you use the polarity or center tests.

Check these items

Check the interface outputs and mixer main outputs. Also check speaker cables, operating system mono audio, Bluetooth routing, and any speaker management processor.

Free speaker system check for stereo setup and polarity

This browser tool helps you check a speaker system before rehearsal, recording, listening, or live sound work. It guides you through left and right channel routing, mono center image, speaker matching, relative polarity, and low-frequency rattle checks.

Channel and center imageUse the channel check and mono center check first. The center sound should stay clearly between the speakers when both sides are working together.
Polarity comparisonUse the normal mode as the reference. If a reversed mode sounds clearer or stronger, check wiring, polarity invert settings, crossover wiring, and speaker connections.
Speaker match and rattle checkCompare low, mid, and high bands. Then use the low-frequency sweep to find buzzes, loose parts, cabinet vibration, or nearby objects that rattle.

What should I test first?

Start with the channel check. Then use the mono center check. After that, run the polarity comparison and speaker match tests if the center image, level, or tone feels wrong.

Can headphones confirm speaker polarity?

No. Headphones can demonstrate the effect, but they cannot confirm speaker cable polarity or room center image. Use real speakers in the actual listening position for that check.

System settings to check when the result seems strange
Device settings

Check the audio settings in your operating system. Turn off mono audio and accessibility audio effects. Also turn off spatial audio, Dolby processing, and browser output device changes if they are enabled.

Signal path

Check the interface outputs, mixer pan, polarity invert buttons, DSP, speaker management, and crossover settings.

Bluetooth note

Bluetooth speakers may add delay, DSP, or automatic channel routing. A wired stereo system is more reliable for polarity and wiring checks.

Headphones note

Headphones can demonstrate the effect. They cannot confirm speaker cable polarity or the center image in your room.

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