Speaker test and volume guide
Check left, right and stereo output with test tones and a frequency sweep, then use the real settings that make a phone speaker louder.
Start with your device volume low. Test tones can be loud on headphones.
Press Left, Right or Both to play a tone.
How to read the speaker test
- Left should play only from the left speaker or earbud, Right only from the right. If they are swapped, check cables or the balance setting.
- If Left and Right both come from both sides, Mono Audio is on (iPhone: Settings › Accessibility › Audio & Visual › Mono Audio) or the speaker is mono. Phone speakers sit close together, so the stereo effect on a phone is subtle.
- Sweep glides from 20 Hz to 20 kHz over 12 seconds. Listen for rattles or buzzing at one point, which usually means a loose part, debris in the grille, or something touching the speaker. Small phone speakers do not reproduce deep bass, and many adults cannot hear above 15 kHz, so silence at the very ends is normal.
- This is a listening check. A web page cannot measure loudness at your ears or prove a speaker is undamaged.
How to make your iPhone louder
- Press volume up while the sound plays, or use the slider in Control Center. Media volume and ringer volume are separate unless Settings › Sounds & Haptics › Change with Buttons is on.
- For Apple Music, Settings › Music › EQ › Late Night (Settings › Apps › Music on iOS 18 and later) compresses the quiet and loud parts so speech and soft passages sound louder at the same volume.
- Sound Check (in the same Music settings) evens out loudness between songs. It can turn loud tracks down, so try switching it off if music seems quieter than expected.
- For headphones, Settings › Sounds & Haptics › Headphone Safety › Reduce Loud Audio caps the level. It protects hearing, so raise the limit only if you need to.
- Clean the speaker grilles with a soft, dry brush. Do not use liquids, pins or compressed air. Make sure a case is not covering the bottom grille.
- Hold the phone in landscape and don't cover either end. Placing it on a hard surface or in a bowl reflects sound towards you.
- On older iOS versions, Settings › Music may have a Volume Limit set; turn it off.
How to make an Android phone louder
- Raise media volume, not ringtone volume: press a volume key, then open the full volume panel.
- Samsung: Settings › Sounds and vibration › Volume › Media volume limiter (turn off), and Sound quality and effects for Dolby Atmos and the equalizer.
- If a Bluetooth speaker is quiet, raise the speaker's own volume too. Some phones have “Disable absolute volume” in Developer options, which keeps phone and speaker volume separate.
About “volume booster” apps
No app or web page can push a phone speaker past its hardware maximum. Boosters add digital gain, which makes quiet recordings louder but clips loud audio into distortion and can damage small speakers. The reliable way to get much louder sound is a bigger speaker: connect a Bluetooth, AirPlay or wired speaker.
Questions
How do I test left and right speakers?
Press Left, then Right. Each tone should come only from that side. If both sides play, Mono Audio is on or the speaker is mono; if they are reversed, the channels are swapped.
Why can I not hear anything on my iPhone?
Turn the volume up. iPhone Safari can mute web audio while silent mode is on; this page asks Safari to play anyway where the browser allows it, otherwise switch silent mode off with the ring/silent switch or Action button.
Can a website boost my speaker volume beyond 100%?
No. A page can add digital gain to its own audio, but it cannot raise the hardware limit. Extra gain on loud audio only adds distortion.
What does the frequency sweep show?
It plays every pitch from 20 Hz to 20 kHz. A buzz or rattle at one pitch points to a loose part or debris. Phone speakers naturally drop out at the deep bass end.
Does this test use my microphone?
No. The tones are generated in your browser and played to your output. Nothing is recorded or uploaded.
From the same developer
- Mic to Speaker: route your iPhone microphone to a speaker in real time.
- Online mic test: check the input side of the same setup.