If you think you have a blown or a damaged subwoofer, you can test the subwoofer using a multimeter, which is the most efficient way. You can do it yourself by following the steps in this article.
Find more bonus ways mentioned below to check if your subwoofer is blown or not!
- 🔌 How To Check a Subwoofer With a Multimeter: Step-By-Step
- 🔊 How To Test A Subwoofer Without An Amp: The Simple Way!
- 🎯 Other Ways Of Testing Subwoofer
- 😷 Common Symptoms Of A Blown Subwoofer
- 💡 How To Test A Subwoofer FAQs
🔌 How To Check a Subwoofer With a Multimeter: Step-By-Step
Follow these steps to check your subwoofer with a multimeter.
1. If you have a reading of 1 ohm or higher, the subwoofer is in perfect condition.
2. If there is no resistance to reading at all, the voice coils are damaged. Which could mean you have a blown-out subwoofer.
3. The worst-case scenario is if the readings change abruptly or keep varying a lot, which means the subwoofer voice coils are completely blown away.
🔊 How To Test A Subwoofer Without An Amp: The Simple Way!
If you have a passive subwoofer that does not have a built-in amplifier or works with an external amplifier, here is how to test it.
But before proceeding, make sure you have the following items available with you:
Now, follow these steps to test your subwoofer:
STEP 1Disconnect the subwoofer with the power supply.
STEP 2Uncover the coil of the subwoofer.
STEP 3Connect and hold the battery’s positive terminal to the positive of the coil, and the negative to the negative terminal of the voice coil.
STEP 4You want to observe if the cone rises up and down or back and forth, and you might hear a noise. If you do, the subwoofer is fine. If the cone does not move, it is probably damaged.
🎯 Other Ways Of Testing Subwoofer
1️⃣ Testing the coil
The coil is an integral part of the subwoofer, which transmits electronic signals.
Here’s how to test your subwoofer coil:
STEP 1Disassemble the subwoofer carefully without damaging any connections.
STEP 2Locate the voice coils of the subwoofer, which are on the rear part of the subwoofer.
STEP 3Now, try to tug gently at the bonded wire of the coil. If you can’t seem to move it, it is stuck in place and is most likely fine. If there is a lot of movement, the subwoofer has a blown-out voice coil.
👉 Alternate method
Follow STEPS 1 and 2 from the above method. Then grab your multimeter and connect the voice coil terminals and that of the multimeter, respectively.
If the readings are above 1 ohm, the coil is in good condition. If it is less, then it is probably damaged. If there are no readings, then the coil is blown.
2️⃣ Testing the cone
The cone is what drives the production of low-end frequencies. Subwoofers feature cones built with suspension structures that allow their back and forth movement, creating a low-end sound.
Check the quality of your cone by following these steps:
STEP 1Uncover the subwoofer.
STEP 2Take a look at the cone, and if you see any scratches or signs of wearing, the cone may need replacement.
STEP 3Gently press on the sides of the cone and press to check the movement.
STEP 4If the cone rises up perfectly and there is no looseness or rigidity in the movement, the cone is good to go.
STEP 5Next, try listening to the cone’s movement while you play music. If there feels like a rustling or a scraping sound, the suspension could be deteriorating.
3️⃣ Testing the sound
Testing the sound is a very straightforward and a sure-shot way of knowing if your subwoofer has blown or not.
4️⃣ Voltage check
Follow these steps for a voltage check to determine a blown-out subwoofer:
STEP 1Get a multimeter to check the voltage reading.
STEP 2Connect alligator clips on the two speaker amplifier terminals. It will allow you to measure the voltage running through the amplifier without contacting any connections.
STEP 3Check the readings. If the voltage reading is absent or negligible, the subwoofer is likely blown.
😷 Common Symptoms Of A Blown Subwoofer
There are quite a few ways to tell whether a subwoofer is blown. The most obvious way to know is via the sound output, so here are a few signs of a blown subwoofer:
💡 How To Test A Subwoofer FAQs
1) Is it possible for anyone to fix a blown subwoofer?
Yes, it is possible to fix a blown subwoofer. It can be difficult or easy to fix a blown subwoofer, depending on the type of the problem. Some issues like a damaged voice coil might demand a complete replacement of the subwoofer.
It would be best to consider the pros and cons of getting a new subwoofer or fixing your current one. It is advisable to consider a new purchase over fixing a blown subwoofer. Or, if you intend to fix it, consult an expert to try and help you.
2) Why does my subwoofer keep blowing?
One of the most common reasons for a subwoofer blowing is an excessive signal supply to the amplifier. Too much power can also make the subwoofer operate beyond its thresholds and result in excessive stress on the subwoofer build.
Also, pushing the subwoofer to its limit while playing music might cause distortion, clipping, and subsequent blowing up of the sub.
3) What is a multimeter, and what are its uses?
A multimeter is an electronic measurement device used to measure electrical values. It is used almost everywhere there is electricity. You can either use a digital multimeter or an analog multimeter.
Checking conductivity, testing the continuity of a circuit, measuring voltage levels across a car battery, and measuring resistance are some instances where a multimeter is used.
4) How do I know if I blew my subwoofers?
If your subwoofer output starts to sound odd and has a feeble bass response that sounds thin and unclear, your subwoofer may have blown.
Another telltale sign is unusual distortion and clipping even while playing music at normal volume. And if there is no sound at all, it is most likely blown.
5) What Things To Check Before Buying A Subwoofer?
Some things to look out for before purchasing a subwoofer:
1. The sound quality of the subwoofer.
2. Size of the cabinet.
3. Size of the driver.
4. Power rating.
5. Type (Sealed or Ported).
7. Frequency range and output volume.
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