Almost every phone made in the last several years has two speakers. The main one fires out of the bottom edge next to the charging port, and the earpiece slot above the screen does double duty as the second stereo channel. They sit in different places, they collect different amounts of dust, and they get wet independently of each other.
Which means the useful question is never “does my speaker work”. It is “which of my speakers is worse, and by how much”, and you cannot answer that by playing a song. Stereo audio is mixed to sound complete even when one channel is weak — that is what stereo is for. A song through one blocked speaker sounds like a slightly disappointing song, not like a fault.
Test a phone speaker
Check the top and bottom speakers on an iPhone or Android separately and work out whether one is blocked.
Take the case off and turn the volume up
Both matter. A case changes what you are measuring, and at low volume a partly blocked speaker sounds identical to a clear one — blockages show up at the top of the range, where the membrane is trying to move furthest.
Disconnect Bluetooth
The most common false result in the whole exercise: the phone is playing beautifully into a car, a soundbar or a pair of earbuds in a bag. Turn Bluetooth off entirely for the duration rather than trusting the little icon.
Play through the bottom speaker alone
Cup your hand over the earpiece slot at the top and play something with a wide range — a full song, not a voice note. Listen for whether the sound is full and open or thin and boxed in. Then cup your hand over the bottom edge and listen to the earpiece alone. CleanWave has this as two buttons so you do not have to improvise with your hands.
Compare them directly
Switch back and forth several times rather than trying to remember. Differences that are obvious side by side are almost impossible to hold in your head across a gap. What you are listening for is not volume alone — it is the top end. A blocked speaker loses treble first, so it sounds dull and distant rather than merely quieter.
Check the character of the sound, not just the level
Quiet and dull means blocked. Crackling, buzzing, rattling or cutting out means something else, and no amount of cleaning will change it. That distinction is the single most useful thing this test produces.
Clean, then test again
This is the step that turns a test into an answer. Run a cleaning cycle and repeat the comparison. If the weak speaker improves, it was blocked and you have found your problem. If it is identical, it was never a blockage and you can stop trying to clean it.
Where the speakers actually are
Reading the result
- Both fine, one slightly quieter
- Normal. The earpiece is physically smaller than the main speaker and is not supposed to match it. What matters is whether it is duller than it used to be, not whether it is as loud as the bottom one.
- One clearly dull and quiet
- A blockage, and the most likely outcome of this test. Run a cleaning cycle, brush the grille, test again. This is the case CleanWave is built for.
- One completely silent
- Either total blockage or a dead driver. Clean it first — a grille can pack solid enough to stop sound entirely — but if two cycles and a brush change nothing at all, it is a repair.
- Crackling or buzzing at volume
- A damaged or corroded driver, very often the aftermath of water that was left to dry. Cleaning does not help and running full-volume tones through it is not a good idea. Blocked or broken covers what to do.
- Both dull, in the same way
- Suspect something upstream rather than the hardware: an EQ setting, a volume cap, a case, or the phone being in a soft pocket. Why your speaker sounds muffled has the checklist.
Test before you clean, and again afterwards
Cleaning without testing is how people end up unsure whether anything happened. A speaker that improves is easy to hear in a direct A/B and surprisingly hard to judge from memory five minutes later, and the improvement from clearing a grille is real but rarely dramatic — it is the difference between dull and open, not between silent and loud.
Doing the before-and-after also tells you when to stop. If two cycles produce a clear improvement and a third produces none, you are done. If none of them produce anything, more cycles are not the answer and the phone is telling you something.