The situation when once pure sound turns into an unpleasant buzz or crackle is familiar to many music lovers and motorists. Suddenly appearing humming It can completely ruin the impression of listening to your favorite track. Most often, the problem lies in mechanical damage to moving parts or electrical failure of components.
In this article, we will discuss in detail the main causes of distortion in sound. You will learn to identify the source of the problem yourself, whether it is a burnt coil, a damaged suspension or problems with an amplifier. Proper and timely diagnosis This will prevent expensive repairs or purchase of new equipment.
Do not ignore the first signs of deterioration in the sound quality. If you notice that there is rattling at certain frequencies, and the bass has become “porridgeous”, this is a signal that you need to intervene. Let’s see what’s going on inside your column.
Mechanical damage to the dynamics
The most common reason why squeakyIt is the physical destruction of its elements. The suspension (swanger), which holds the diffuser and ensures its return to its original position, eventually dries up or tears. This is especially true for foam suspensions, which are subject to aging under the influence of moisture and temperature changes.
If the suspension is damaged, the diffuser begins to go with a distortion. This leads to the fact that sound-coil It's touching the core magnetic system. It is this metal-to-metal contact that creates the very unpleasant grinding or wheezing you hear. Visually, this is often not noticeable, but with a light press on the diffuser with your finger, you can hear the characteristic sound of friction.
⚠️ Attention: Do not force the diffuser inside if it has already jammed. You can permanently damage the coil winding or deform the frame.
Another mechanical defect is the separation of the coil from the frame or the diffuser itself. This occurs during extreme overloads or shocks. In this case, the coil can dangle inside the magnetic gap, creating chaotic sounds. Recovery of such a design requires professional rewinding or replacement of the speaker.
Electrical faults and overload
It's not just the mechanics who are to blame for the bad sound. Often the reason lies in the electrical part. Power overload - Enemy number one for acoustics. If you send a signal to the column, the power of which exceeds the nominal, the coil begins to overheat.
When the heat is over, the varnish that covers the winding melts. At best, this leads to a change in the parameters of the coil and the appearance of distortion. At worst, there is an interturn or a complete break. Burnt coil It often emits a burning smell, which can be felt by sniffing at the diffuser.
What's a clipping?
Clipping is a form of signal distortion where the wave amplitude is cut off due to a lack of amplifier power. This creates a “square” wave effect, which is equivalent to a direct current supply and instantly overheats the speaker coil.
It is also worth checking the integrity of the wires. If the speaker cable is interrupted or oxidized at the contact point, the resistance of the circuit changes. This can cause signal interruptions, perceived as clicks or wheezing. Pay special attention to the places of soldering of wires to the terminals of the speaker - thin veins are often broken off there.
Amplifier problems can also mimic column failure. If the amplifier's output cascade is faulty, it may produce a signal with a constant component. This causes the diffuser to shift from the center and operate in a nonlinear mode, causing severe distortions.
Problems of crossover and filters
In multiband acoustic systems, a crossover is responsible for the division of frequencies. This device consists of capacitors, inductors and resistors. Over time, capacitors may lose capacity or “dry out” especially if the system was operating in high temperatures.
A faulty capacitor in a high-frequency speaker (tweeter) circuit may miss low frequencies that are not intended for it. As a result, RF speaker It starts to wheez and can quickly burn from overload along the way. Verification of crossover components requires a multimeter and, preferably, a capacitor tester.
☑️ Diagnostics of the crossover
Another rare but possible problem is the rattling of components inside the crossover body. If the inductor coils are not securely secured, they can vibrate in bass beat, creating extraneous noise. In such cases, it helps to carefully fix the elements with thermal glue or paraffin.
Influence of the housing and fasteners
Sometimes the sound source is not in the dynamics itself, but in its surroundings. Weakened screws attaching the speaker to the body cause strong rattling. When working at high volume, the diffuser swings, and if it is not pressed tightly, the metal frame begins to vibrate against wood or plastic.
It is also worth checking the integrity of the body itself. Cracks in a wooden box or poor-quality gluing of panels in budget acoustics lead to the appearance of a “buzz” of the case. The sound becomes taunting and indistinct, the clarity of low frequencies is lost.
Pay attention to the sealing pads. If there is no tightness between the speaker and the body (phase inverter ring or foam tape), an acoustic short circuit occurs. It's not always wheezing, but the sound becomes flat and devoid of volume.
Use rubber washers or pads under the hats of the speaker mounting screws. This will help eliminate the micro-vibrations of metal against metal, which are often mistaken for wheezing dynamics.
Diagnosis: How to find the culprit
To determine exactly why squeakIt is necessary to conduct a consistent diagnosis. First, you need to eliminate external factors. Try reconnecting the signal source, replacing the cable, or connecting the column to another amplifier. If the wheezing was gone, the problem was not acoustics.
If the speaker is connected to the stereo, change the channels. If the wheezing “moved” along with the column to another channel, then it is precisely in it. If the wheezing remains in the same channel, the amplifier or head unit is defective.
For a deeper check, you can carefully remove the speaker from the body (unscrewing the screws, but not unplugging the wires) and apply a low-volume test signal to it. A light press on the diffuser at different points will help to identify the distortion of the coil. If there is no wheezing in the center when pressed, and when it moves to the side it appears - the coil is deformed or skewed.
| Symptom | Probable cause | Method of elimination |
| :--- | :--- | :--- |
| Bass crack | Breaking suspension or hitting the coil | Replacement suspension or speaker |
| Hissing on high | Twitter or crossover malfunction | HF head repair or capacitor replacement |
| Periodic wheezing | Bad contact in wires | Overploughing or cable replacement |
| Boom bubbling | Weakened fasteners | Screw lift, sealing |
| Wheezing at high volume | Coil overheating (clipping) | Volume down, speaker replacement |
The most reliable method of diagnosis is the method of exclusion. Change the components of the chain (source, cable, amplifier, columns) to localize the faulty node.
Prevention and proper selection of power
To the question “why the column wheezes” does not arise before you regularly, it is important to follow the rules of operation. The main one is the coordination of the power of the amplifier and acoustics. Do not try to squeeze the sound of a powerful system out of budget acoustics, twisting the volume regulator to zero.
Use it. power-rule: The amplifier should have a power margin (about 20-30%) relative to the nominal speakers, but you should not use this margin constantly at maximum volume. This will ensure that the work in linear mode without distortion.
Regularly wipe the dust from the diffusers and check the condition of the terminals. Contact oxidation is the silent killer of quality sound. If you use the system in the car, watch for humidity in the cabin, as condensate is harmful to paper diffusers and foam hangers.
How to prolong the life of a pore suspension?
There are special compositions for the restoration of the foam, but it is best to simply avoid direct sunlight on the speakers. Ultraviolet destroys the structure of the material most quickly.
Remember that high-quality acoustics require careful attitude. Timely maintenance and understanding of the physical processes involved in sound reproduction will help you enjoy a clean and deep sound for years to come. Don’t ignore the first “bells” in the form of slight distortions – repairs at an early stage are always cheaper than replacement.
Can I repair the torn suspension myself?
Yes, you can. To do this, you will need to buy a repair kit (rubber or foam suspension in diameter speaker), special glue and, possibly, new centering washers. The process requires accuracy: you need to completely remove the old glue, perfectly center the coil and glue a new suspension. However, without experience, the risk of overmowing the coil is high, so for expensive acoustics it is better to contact the master.
Why does it only wheez at low frequencies?
Wheezing at low frequencies (bass) most often indicates that the diffuser stroke is too large. This can be caused either by excessive volume (overloading along the way), or wear of the centering washer, which ceased to hold the coil strictly in the center. Also, the cause may be depressurization of the body or phase inverter.
Does the quality of the cable affect wheezing?
The cable itself rarely causes wheezing unless it is physically damaged. However, if the cable is too thin for a powerful system, it can have high resistance, resulting in loss of damping and control over the speaker. But more often, the “wheezing” from the cable is a consequence of poor contact in the connectors or oxidation of the veins.
What to do if the speaker wheezes after washing the car?
Most likely, moisture got inside the speaker or on the terminals. It is necessary to allow the system to dry completely in a warm dry room for 24-48 hours. Do not try to dry the speaker with a hairdryer in hot air - this can deform the glue and suspension. If the wheezing remained after drying, it is possible that the water caused corrosion or detachment of the coil.