Dead, Blown or Miswired: Diagnosing a Silent Speaker
When a speaker goes quiet, most people assume the worst and most expensive thing: the speaker inside has died and it's headed for the bin. Sometimes that's right. Just as often the speaker is perfectly healthy and the problem is a loose connector, a balance setting nudged to one side months ago, or a torn cone that buzzes on real music instead of staying silent the way a truly dead speaker would. Dead, blown and miswired can sound similar enough from your chair that guessing wrong means buying a replacement for a problem a five-minute cable swap would have found.
Three faults, one symptom
"No sound from that speaker" covers three different faults, and each needs a different fix. A dead speaker has a break somewhere between the amplifier and its voice coil, like a snapped internal wire, a corroded connector or a coil that has burned through, so no signal reaches the cone at all. A blown speaker is getting the signal and trying to move, but something in its moving parts is damaged. Most often that's a torn cone or surround, or a voice coil that rubs against the magnet after being knocked or overheated. A miswired speaker is perfectly healthy: it's getting a clean signal and its coil is fine, but something before it makes it sound wrong or silent anyway. That could be reversed wires, swapped channels, a balance setting or a mono switch left on. Only one of the three is actually broken hardware.
Swap it to find out which
Before opening a cabinet or reaching for a meter, move the problem instead of guessing. Connect the cable from the silent speaker to a channel you know works, or connect a speaker you know is good to the suspect channel. If the fault follows the speaker to the new channel, the speaker is the problem: dead or blown. If the channel stays silent with a good speaker on it, the cause is further back: the cable, the connector, the amplifier or a setting that mutes that side. This one swap tells you "speaker problem" from "everything else" before you touch a screwdriver, and it costs a few minutes.
The one tool that really helps: a multimeter
A cable swap tells you whether the fault moves with the speaker. A multimeter tells you whether the speaker itself has a break. Set the meter to resistance, disconnect the speaker from the amplifier, and touch the probes to its two terminals. The reading tells you which fault you're looking at. The meter only uses a tiny current from its own battery, nowhere near enough to move the cone the way connecting a battery directly would, so this check is safe on any speaker, tweeters included. It applies to ordinary dynamic speakers, the coil-and-magnet design in most laptops, phones, desktop speakers and headphones, and the figures below are two manufacturers' own numbers for that design.
| Multimeter reading | What it means |
|---|---|
| On a guitar or pro-audio cone driver, below the rated impedance but not by much — roughly 5-8 Ω on an 8 Ω driver, about double that on a 16 Ω one, per Celestion's own figures for its speakers | Healthy, for that kind of speaker. If it's still silent, the problem is further back, not in the speaker. |
| On a car-audio cone driver, a reading clearly under the rated figure — a 4 Ω-rated driver commonly reads about 3.4 Ω, per Kicker's own technical paper | Also healthy. Different maker, different market, same pattern: the rated figure is measured differently, and a meter reads lower. Not a fault on its own. |
| Infinite, or "OL" on the display | A break. The coil's circuit is broken, from a snapped internal wire or a burned-out coil. This is a dead speaker. |
| Roughly normal reading, but the speaker distorts or won't move smoothly by hand | The coil is fine; the fault is mechanical. This is a blown speaker, not a dead one. |
Neither maker measured a laptop, phone or earbud speaker, so treat the exact figures above as what an ordinary dynamic cone speaker does, not a universal number. Planar-magnetic and balanced-armature speakers, common in higher-end in-ear monitors, work differently and won't sit in these ranges at all. What does hold for every design is the pattern of the two real faults: a reading near zero, or one stuck at infinite or "OL", means a shorted or broken coil, whatever the speaker's rating.
Celestion's troubleshooting advice for its speakers adds a second check that needs no meter at all: a healthy cone "should move freely for a few millimetres" when you press it gently, and spring back without any scraping or grinding. If it grinds or scrapes as it moves, the coil is rubbing against the magnet. That's a mechanical fault a meter won't always catch, because a rubbing coil can still read close to normal until it finally shorts.
What a blown speaker actually sounds like
Total silence at every volume and every pitch is much more often a dead speaker or a dead channel than a blown one. A blown speaker usually hasn't stopped moving; it has stopped moving properly, and damaged speakers are rarely quiet about it. Celestion's repair notes describe a torn cone as something that "will lead to rapid failure", and it tends to show up first as buzzing, not silence: a small tear rattling against itself on certain notes, loudest where the cone moves the most. A rubbing voice coil adds a scratchy, grinding texture on top of the sound, again worst at the pitches and volumes that move the cone furthest. If a speaker sounds clean when it's quiet and only distorts, buzzes or crackles as you turn it up, that's the sign of a blown speaker, not a dead one.
Our speaker test is made for exactly this comparison. It plays the same steady tone into one side at a time, so you can listen for a clean tone, a distorted one or nothing at all with the sound itself kept the same. Music can't do that, because songs are mixed differently on each side, so one side can sound different even when both speakers are fine.
Rule out wiring and settings before blaming the hardware
A speaker that's neither dead nor blown can still seem broken. Settings are the quickest thing to check and the easiest to forget. A left/right balance slider nudged off-centre quietly favours one side until someone finds it. A "mono audio" accessibility switch, found in both Windows and macOS, mixes both sides into the same sound, which can hide a real channel fault or make it look like there's one when there isn't. Reversed polarity is a wiring fault, not a setting. Connect one speaker's wires backwards compared to its partner, and instead of silence you get a very particular sound: thin and hollow, with no solid centre, because the two speakers are now pushing air in opposite directions instead of together. None of this shows up on a meter, because nothing in the speaker is actually damaged.
Putting it all together
Start with the cable swap: it separates the speaker from everything else in under a minute. If the fault stays with the speaker, a multimeter across its terminals tells you dead (a break) from blown (a normal reading, but damaged movement) in one go, and a gentle press on the cone catches the rubbing coil a meter can miss. If the speaker reads fine and moves smoothly, look further back, at balance settings, a mono switch or reversed wires, before assuming anything is broken. If it's one side of a pair of earbuds or headphones rather than a room speaker, why is one earbud quieter covers a narrower, more common version of the same question. And once you know a speaker is healthy, speaker placement and room acoustics explains how a perfectly good speaker can still sound weak or hollow just because of where it sits in the room.
The resistance ranges above come from Celestion's troubleshooting guidance for its guitar and pro-audio speakers, and from a Kicker (Stillwater Designs) technical paper on its car-audio speakers. Both are linked at the figure they support, and each applies to the products it measured.