The situation when you turn on your computer in the hope of working or relaxing with your favorite game, and instead of clear sound you hear an obsessive hum, is familiar to many. This low-frequency noise, often called “background,” can completely ruin the experience of any multimedia content. Constant hum It’s not just annoying, it makes it difficult to concentrate and enjoy quality audio.
The reasons for the occurrence of such interference can be completely different: from a banal bad contact in the connector to complex electromagnetic interference inside the system unit. In this article we will look in detail at why are the speakers making noise?, and we will draw up a step-by-step action plan to eliminate the problem.
Before you panic and take the equipment to a service center, it is worth conducting basic diagnostics. Often the problem is hidden on the surface and can be solved in a couple of minutes by correct switching or simple software settings. Hardware conflicts and software glitches are the two pillars on which most audio interference rests.
Physical damage and connection quality
The most common reason for the appearance of extraneous sounds lies in mechanical damage or poor quality of connecting cables. Cheap wires without proper shielding work like antennas, collecting electromagnetic interference from surrounding devices. If the cable is pinched, twisted or has microcracks in the insulation, the signal is distorted, generating a characteristic crackling or hum.
Particular attention should be paid to where the plug enters the connector. Over time, the contacts oxidize or become loose, resulting in an unstable connection. Poor contact in a 3.5mm (mini-jack) or RCA jack is often the culprit for intermittent sound. Try gently moving the wire at the base of the plug: if the nature of the noise changes, the problem is in the contact group.
To fix problems with cables, you don’t have to immediately buy expensive speakers. Sometimes it is enough to replace the wire or use adapters with ferrite filters. Ferrite rings on cables help cut off high-level interference, making the signal cleaner.
⚠️ Attention: Do not use excessively long cables without a signal booster. Too long an unshielded wire turns into an ideal antenna for catching radio interference.
Power and grounding problems
The second most common reason why are the speakers making noise?, is poor quality power supply. If your outlet does not have a reliable grounding, static potential may accumulate on the case of the system unit and audio equipment. This results in a low-frequency hum, the frequency of which often coincides with the mains frequency (50 Hz).
The situation is aggravated if the computer and active speakers (or amplifier) are connected to different outlets, especially if they are on different phases or are distant from each other. The potential difference between devices creates a so-called “ground loop”, which manifests itself in the form of a nasty background. Grounding - this is not just a formality, but a necessary condition for high-quality operation of audio equipment.
Try connecting the system unit and the speaker system into one surge protector. This often helps to equalize potentials and remove background hum without additional investment.
It is also worth checking the power supply of the computer itself. Old or low-quality power supplies can produce “dirty” current with ripples that penetrate the audio path, especially if a built-in sound card is used. In such cases, installing a high-quality surge protector or voltage stabilizer helps.
Impact of electromagnetic interference from PC components
Many processes occur inside the system unit, accompanied by powerful electromagnetic radiation. A graphics card running in 3D-accelerated mode, a processor under heavy load, and even a hard drive can cause interference. If the speaker system or its cable are located too close to the PC case or monitor, interference is inevitable.
Owners of active speakers with a magnetic system, which stand right on the table next to the system unit, suffer especially often. The magnetic field from the speakers can interact with the fields of other devices, and the wires lying on the power supply receive all the radiation. Electromagnetic compatibility components in a cramped PC case is a difficult engineering challenge.
The influence of mobile phones
The familiar clicking or crackling sound in your speakers when you receive an incoming call on your cell phone is a classic example of radio interference. Speakerphone or data transmission via 3G/4G creates powerful impulses, which cheap acoustics perceive as an audio signal.
To minimize the impact, try to keep sources of interference separate. Place the subwoofer under the table and move the system unit away from the speakers. Use double shielded cables, which better protect the desired signal from external influences.
Software conflicts and driver settings
Don't discount the software part either. Sometimes sound card drivers do not work correctly, causing digital distortion that is audibly perceived as hissing or crackling. An interrupt conflict or an incorrectly set sampling rate can lead to artifacts.
Check the sound settings in your operating system. Go to the audio control panel and make sure that the microphone or line-in gain levels are not turned up to maximum unnecessarily. Microphone Gain (Microphone Boost) often adds the audio codec's own noise to the signal.
☑️ Driver diagnostics
It's also worth checking to see if any sound "enhancers" built into the drivers are enabled (for example, Dolby, DTS or proprietary utilities from Realtek). Sometimes their algorithms do not work correctly and introduce distortions. Try turning off all effects and check the sound clarity in standard mode.
Diagnostics of built-in and external sound cards
Built-in audio solutions integrated into the motherboard are extremely sensitive to interference inside the case. The signal passes through the entire board, collecting interference from the video card and power circuits. If you have the speakers are loud It is through the built-in output, this is a classic symptom of the low quality of the audio path on the motherboard.
The solution may be to purchase an external USB sound card. It takes digital-to-analog conversion out of the noisy computer case. Even inexpensive external solutions often sound clearer and have better noise immunity than built-in codecs.
| Connection type | Interference level | DAC quality | Recommendation |
|---|---|---|---|
| Built-in card (3.5 mm) | High | Basic | For office work |
| External USB card | Low | Medium/High | Optimal for home |
| Optical output (S/PDIF) | Minimum | Depends on DAC | For Hi-Fi systems |
| Bluetooth | Missing | Depends on codec | For wireless speakers |
When using an external DAC (digital-to-analog converter), cheap USB cards can “froze” on their own due to poor filtering of power from the USB port.
Impact of third-party equipment and peripherals
Sometimes completely unexpected devices become the source of the problem. Webcams connected to your PC, external hard drives, or even phone chargers lying nearby can contribute to the overall background noise. Signal interference - an insidious thing.
Try the elimination method: disconnect all unnecessary USB devices, leaving only the keyboard and mouse. If the background disappears, connect devices one at a time to find the culprit. Often, cheap Chinese gadgets do not have electromagnetic compatibility certification and make a lot of noise on the air.
⚠️ Caution: Do not connect audio cables in parallel with power cables or other high current wires. The intersection should be strictly at an angle of 90 degrees, if it is impossible to avoid laying nearby.
It is also worth checking if there is a Wi-Fi router next to the speakers. Wireless frequencies may resonate with speaker frequencies, causing a high-frequency squeak or crackling noise when data is being transmitted.
Final recommendations for eliminating noise
To summarize, dealing with background noise is a complex process. You should always start with the simplest thing: checking the cables and their location. Then you should move on to software settings and driver updates. If this does not help, you should think about upgrading your equipment or buying an external sound card.
Key takeaway: 90% of background noise problems can be resolved by replacing unshielded cables, proper grounding, or upgrading to an external USB sound card.
Do not ignore the problem, hoping that it will “go away on its own.” A constant hum is not only annoying, but can also indicate more serious faults in the electronics, which over time can lead to failure of the equipment. High quality sound It starts with proper organization of the workplace.
Why do my speakers make noise even when the sound is turned off?
If the system is muted but the hum remains, this indicates that the problem is hardware-based and not affected by software amplification. Most likely, the issue is poor grounding, interference from the 220V network, or a malfunction of the amplifier inside the speakers themselves. In this case, the software volume sliders do not affect the power circuit.
Can a virus cause audio interference?
Theoretically, yes, if the virus loads the processor or network adapter, causing drivers to malfunction. However, most often the “crackling” noise under high CPU load is associated with power-saving settings of USB ports or a lack of sound card buffer resources, and not with malicious code.
How to check if the speakers are humming due to the microphone?
Users often confuse background noise with acoustic feedback. If you hear an echo of your voice or noise from the room in the speakers, your microphone is listening. Go to the sound settings, the “Recording” tab, microphone properties and uncheck the “Listen from this device” checkbox.