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Free studio tool

Speaker test.
Left, right, phase.

Play pink noise or a sine wave to one side, both sides, or out of phase. Use it to confirm a stereo pair, catch a swapped cable, or hear whether your headphones are wired in polarity.

  • Free, no signup
  • Left / right / polarity
  • Sweep 20 Hz–20 kHz
  • Works on headphones

Speaker and polarity tester

Press a side to start. Audio stays off until you do.

Frequency—
Nearest note—
Output—

L left   R right   C both   Space stop

Signal
Sweep length
Volume −20 dB

How to use it

A five-minute speaker check

  1. Sit in the middle, or wear the headphones you actually mix on. Start quieter than you think.
  2. Play Left only, then Right only. The silent side should be silent. A faint bleed means the room, not a wiring fault, unless it is loud.
  3. Play Out of phase with pink noise or 80 Hz. Bass should hollow out. If it gets bigger, flip one speaker's polarity and test again.
  4. Run the sweep once and note any frequency that rattles a fitting or disappears. Those are the bands not to trust when you EQ.

This page generates the signals in your browser with the Web Audio API. Nothing is uploaded. The canonical page for a single pitch, with its note name and wavelength, lives under frequency reference.

StudioEars app icon
StudioEarsEar training for iPhone & iPad

Train the ears that judge the speakers.

A speaker test tells you the system is honest. StudioEars trains you to hear EQ, compression and pitch once it is.

Download on theApp Store

Free to start. 5 free training units every day plus built-in studio tools.

  • EQ & compressionDaily drills on drums, bass, guitars and full mixes.
  • Intervals & chordsPiano training that uses the same note names as these pages.
  • Studio toolsMetronome, tone generator and tap tempo live in the app too.

Explore the cluster

Tone generator Sine, square, saw, noise and sweeps from 20 Hz to 20 kHz. Open the generator → EQ frequency chart Hear where each instrument sits, then solo the band. Open the chart → 1 kHz reference A single 1,000 Hz tone with the nearest note and wavelength. Play 1 kHz →

FAQ

Speaker test questions

What does an out-of-phase test tell me?

When both speakers play the same tone with one side inverted, bass should thin out or almost disappear in the middle of the room. If the low end gets louder instead, one speaker or one headphone driver is already inverted.

Pink noise or a sine wave?

Pink noise shows level and tone differences between left and right quickly. A sine wave, especially a slow sweep, shows rattles, holes and the exact frequency where a speaker drops out.

How loud should I listen?

Keep the speaker test at a conversation level. These pages can generate steady tones and noise, which fatigue your ears faster than music. If anything rings or feels uncomfortable, stop and turn the volume down.