Left, right and frequency checks
Check left and right channels, hear bass, voice and treble, and sweep 20 Hz to 20 kHz to find rattles or dead ranges.
Pick a test on the right. Start at medium volume.
Which speaker plays?
How does each range sound?
Listen for rattling, crackling or a range that drops out. Many phones have a single loudspeaker, so left and right may both come from the same place.
Listen for what changes between tests, not just whether you hear something.
A short beep on one channel at a time. On stereo phones the earpiece is usually the second speaker, so one side may sound thinner. Many phones have a single loudspeaker, and both sides play from it.
Small phone speakers barely reproduce deep bass, so a faint tone is normal. A buzz or rattle is not, and points to debris or a loose part.
The middle of the range, where speech lives. It should sound clean and steady. Muffling here usually means something is blocking the grille.
High notes suffer first when water or dust sits in the mesh. The 12 second sweep shows exactly where sound drops out or starts to rattle.
A few minutes of careful listening tells you whether to clean, change a setting or book a repair.
Take off the case and disconnect headphones and Bluetooth speakers so you test the built-in speakers only.
Play Both, then Left and Right. Note whether one side is silent or distorted.
Run the full sweep at about half volume and listen for buzzing, crackling or gaps.
If something sounds off, run a cleaning cycle and test again before deciding it’s damaged.
Dirt and water usually make sound duller and quieter, and they improve with a few cleaning cycles. Damage behaves differently:
If you see these, cleaning won’t fix it. A repair shop can replace the speaker, which is usually a small part.
Muffled but improving? Go back to the speaker cleaner and run another cycle.
Many phones have one loudspeaker, so both channels play from the same place. On stereo phones the earpiece acts as the second speaker, which makes one side sound thinner.
Phone speakers roll off at very high frequencies, and most adults can’t hear much above 15 to 17 kHz anyway. Silence near 20 kHz is normal.
Yes, at low volume. Put the headphones on only after lowering the volume, and start with Left and Right to check the channels aren’t swapped.
Short tests are fine, but run the sweep at medium volume. High-pitched tones at full volume are unpleasant and add needless strain.
All cleaning modes in one tool: water eject, dust shake, deep clean and more.
165 Hz pulses that push water out of a wet speaker.
Sweeping tones that shake loose lint and dust.
Steps and fixes for every iPhone with a bottom speaker.
Galaxy S, A, Z Fold and Flip, with vibration assist.
MacBook and Windows laptop speakers and grilles.
Rotating bass bursts for stubborn muffling.
Earpiece cleaning for quiet or muffled calls.
Any frequency from 20 Hz to 20 kHz, four waveforms.
Pixel, Xiaomi, OnePlus, Oppo, Realme, Vivo and more.
Safe hand cleaning plus a gentle tone option.
JBL, Bose, Sony and other portable speakers.