How to solve the current sound of audio equipment
Many situations will Causes the sound to have noise, such as the speaker is interfered, the interface or connecting line is in poor contact, the sound quality itself is poor, and so on.
Generally speaking, most speakers are active speakers, and there must be an amplifier inside, so noise is unavoidable. The noise of active speakers can be roughly divided into electromagnetic interference, mechanical noise and thermal noise according to the source. .
Speaker problems lead to:
1. Electromagnetic interference
Electromagnetic interference can be mainly divided into Power transformer interference and stray electromagnetic wave interference.
1. Power transformer interference
Due to the leakage of the power supply of the multimedia speaker, the effect of adding a shielding cover to the transformer if conditions permit It is very obvious that the magnetic flux leakage can be blocked to the greatest extent, and the shield can only be made of iron-type materials. We should try to choose products with big brands and solid materials. In addition, using an external transformer is also a good solution.
2. Stray electromagnetic interference
It is relatively common, and speaker wires, frequency dividers, wireless devices or computer hosts will all become sources of interference. Keep the main speakers as far away from the computer as possible, and reduce peripheral wireless devices.
Second, mechanical noise
Mechanical noise is unique to active speakers. During the working process of the power transformer, the vibration of the iron core caused by the alternating magnetic field will produce mechanical noise, which is very similar to the buzzing sound produced by the fluorescent lamp ballast. Choosing a good quality product is still the best way to prevent this noise. In addition, we can add a rubber damping layer between the transformer and the fixing plate.
Third, thermal noise
If the potentiometer is used for a long time, there will be problems such as dust accumulation and wear between the metal brush and the diaphragm If the contact is bad, noise will be generated when rotating. If the screw of the speaker is not tightened, the inverter tube is not handled properly, and mechanical noise will also be generated when playing large dynamic music.
This thermal noise can be dealt with by replacing low-noise components or reducing the workload of the components. In addition, reducing the operating temperature is also one of the effective methods.
In addition, some computer speakers can also make noise when the volume is turned up too high. This is because the output power of the power amplifier may be small, and the large dynamic peak signal at the moment of music cannot be avoided, or because there are many situations that can cause noise in the speaker, such as the speaker is interfered, the interface or cable is in poor contact, the speaker The quality itself is poor and so on.
Other problems cause:
1. The card is incorrectly inserted
The sound card is not the same as the motherboard expansion slot Strict separation, after visual inspection, it can be seen that the “gold finger” on the sound card is misplaced with the expansion slot reed. This phenomenon occurs on ISA cards or PCI cards. It is a common problem. If you find a way to make the sound card inserted correctly, you can solve the problem.
2. The active speaker input terminal is connected to the Speaker output terminal of the sound card
The active speaker should be connected to the Line-Out terminal of the sound card. The output signal is not amplified on the sound card, and the noise is much smaller. Some sound cards only have one output terminal. Whether it is Line-Out or Speaker depends on the jumper on the card. The default mode is usually Speaker, so if necessary, you have to unplug the sound card to adjust the jumper.
3. Sound card driver problem
You may be using the driver that comes with the system, or there is a problem with the driver. If so, you can replace it a sound card driver.
Q: How can I eliminate these current noises?
Answer: It is recommended to use the exclusion method:
1. First, connect the computer audio to the left and right channels (red and white lotus plugs) on the subwoofer and switch each other Plug it in, and then listen to the original speaker to see if there is any noise.
A. If there is no noise and the other speaker has noise, it means there is a problem with the audio cable. Solution: Replace the audio cable from the computer to the subwoofer.
B. If there is still noise, it means that the problem is not the audio cable. please watch the following part.
2. Swap the cables connecting the subwoofer to the two small speakers, and then listen to the original speaker to see if there is any noise.
A. If there is no noise and the other speaker has noise, it means that there is a problem with the internal circuit or circuit of your subwoofer. It is recommended to find someone to open the subwoofer and check whether the internal circuit and circuit are soldered. , whether the capacitor or a part is damaged.
B. If there is still noise, it means that there is a problem with the speaker cable, or there is a problem with the small speaker itself.
3. You can use earphones to hear if there is any noise. If there is only noise, it means that there is a problem with the computer’s sound card hardware or software, and you can
rule out the speaker problem.
If there is no noise with headphones, it can be determined that there is a problem with the external sound reinforcement equipment of the computer, that is, there is a problem from the audio connection cable to the place between the two small speakers. Don’t worry, use the elimination method to find the problem.
Additional instructions:
1. Do not put mobile phones, radio receivers, transmitters and other radiation interference devices near subwoofers and small speakers.
2. Do not use a plug-in strip for the power supply of the subwoofer and other high-power electrical power supplies at the same time, so as to avoid unstable voltage and insufficient current, which may interfere with and damage the work of the speaker.
For more audio speaker troubleshooting knowledge, please click to view [Audio Speaker Knowledge Lecture Hall>>]
