The speaker bass hum has a resonance, what is the reason for the speaker subwoofer hum

This can be caused by cable connection issues with the speaker and can be ruled out by trying to reconnect or change the cable more depending on the power of the speaker.

Internal control system – a constant optimum state and a computer-controlled volume eliminates this problem.

It is also possible that the left and right channels are connected incorrectly, find a song that is obvious on the left and right to test to see if it is installed in the wrong position, and if it is installed incorrectly, you can reinstall it.

In addition, the biggest reason is that any set of audio currently produced has a zizilala sound of electric current, which is a real audiophile.

The pursuit of a lifetime is the sound of Zizila without current, which is due to the principle of power amplifier work. So there is also a certain possibility that your amplifier is not very good, - it is recommended not to turn the amplifier volume to the maximum for a long time.

It's normal for the sound to be distorted if you turn it on too much, unless it's the top quality speaker, so just turn the volume down a little bit.

The speaker bass has resonance, and the volume of the bass can be appropriately reduced through the sound source or EQ adjustment, and the bass resonance can also be effectively eliminated by reinforcing the cabinet, adding sound-absorbing cotton in the cabinet, and placing the speaker away from the wall.

The speaker bass has resonance and is prone to mechanical noise, because the bass frequency coincides with the reflected frequency of the speaker, and the resonance oscillation is generated. Solution: Attach a layer of sound-absorbing cotton inside the speaker.

The sound subwoofer has a humming sound that can be eliminated by:

1. Check the hum **: turn off the volume potentiometer, there is still a hum at this time, which is the reason for the power supply, measure whether the four rectifier diodes are intact (the rectifier diode and the filter capacitor in the red circle), and then check whether the filter capacitor is normal, and see if the filter capacitor is invalid and in poor contact. The power supply circuit is shown in the figure

2. The humming sound changes with the volume, check whether the grounding end of the audio cable falls off or has poor contact, and twist the audio cable twice.

3. When the sound source and audio cable are well connected, and the hum increases with the volume adjustment, it means that the voltage amplification circuit of the front stage of the power amplifier is faulty, and it needs to be eliminated by professionals.

The hum of the subwoofer can be controlled by the bass adjustment potentiometer, and the bass power amplifier TDA2030 is preliminarily judged to be normal.

The fault range should be in the pre-amplification or low-pass filtering part, the most likely is the noise caused by the poor performance of the pre-chip RC4558, after (the ratio of R17 R18) about 6 times amplification, into the subwoofer power amplifier, restored to the nasty hum noise. Replacing the op amp chip can solve the problem.

The role of the subwoofer is to highlight the sound of low frequency when ****. It can't reflect the melody of **, it can only accentuate the rhythm of **, that is, the sound that comes out of it is just"Knock knock"Heavy bass. It is a manifestation of strength and hardness, which can reflect a strong impact and vibration, and rock and disco ** mainly rely on it to express that kind of heavy force.

If the subwoofer is broken, it can be selected separately, a good set of sound actually has a good bass, but with the subwoofer, it is easier to get the kind of intoxicating sound you want. A broken subwoofer is generally not easy to repair. , you can consult the dealer who purchased it.

<>1. Because the clutter filter of the transformer output power supply in your subwoofer is not clean, the horn produces a humming sound, which is the so-called "AC sound". If you have strong hands-on ability, you can get better results by connecting a larger capacitor in parallel at the place where the transformer output has been rectified (pay attention to the polarity and withstand voltage value).

2. If the above methods can't solve the problem, it means that the magnetic flux leakage of your transformer is more serious, and the electric field caused by the alternating magnetic field produces a humming sound in the horn. You can use a thin copper sheet to carefully wrap the core of the transformer, and it's OK, or you can use aluminum foil, but the effect is not as good as copper foil.

3. Take a look at your input socket, if the grounding position (the metal outside the lotus socket) is not open and soldered, you can find a small porcelain capacitor and connect it between the input (the middle of the lotus socket) and the grounding.

4. As soon as the active speaker is turned on, the subwoofer emits a huge "buzzing" sound, which is due to the fact that this is a problem with the audio circuit, and there is no circuit in the audio to filter out the pop-noise generated by the boot.

At the moment when the speaker is turned on, there is a large DC current through the speaker to produce a loud noise. There should also be noise in the two small speakers, but the reason for the frequency attenuation is very small. Here's how to fix it:

Replace it with a better speaker, or plug in a voltage regulator for the speaker.

1. Turn the volume of the volume potentiometer to the lowest, that is, silent, there should be no sound at this time, if there is a humming sound, it is caused by the change of the capacity of the electrolytic capacitor in the filter circuit of the power amplifier, which is too small; If you turn on the loud sound, there is a big humming sound, which is caused by the poor shielding of the audio input of the power amplifier, check and eliminate the shielding fault.

2. The shell of each element must be grounded, and the audio input line must be shielded and well grounded.

3. The horn hisses, most of which is caused by poor overall shielding, or the primary stage of the power transformer winding is not isolated. The solution is actually very simple, that is, just turn the power plug around, if it doesn't work, connect two 4700p capacitors with a working voltage of 250V in series at the power input end (the power input end of the transformer), and the center tap is grounded, which can also reduce noise.

1.Speaker cable connection issues – reconnect or replace cables to rule out.

2.Internal control system – a constant optimum state, the volume is controlled by a computer and can be eliminated.

3.Left and right channel connection error - find a song that is obvious left and right and test it from a new connection to rule it out.

The 20hz-60hz section of the boost can give a powerful feeling and give people a very loud feeling, such as thunder. It is a strong and powerful feeling in **, if the volume of this frequency band is too small, the feeling of abundance and surging must not be there; In addition, it will lead to the prominence of mid and high frequencies, which will make the sound lose its balance and make it difficult to listen to for a long time. If the boost is too high, it will be cloudy and cause poor clarity, especially in audio equipment with poor low-frequency response and heavy low-frequency.

60Hz--250Hz is the low-frequency structure of **, which contains the basic tone of the rhythm part, including the main tone of the fundamental tone and the rhythm tone. Its ratio to the high midrange constitutes the balanced character of the timbre structure. Elevating this segment will make the sound fuller, and over-boosting it will make a rumbling sound.

Attenuating these two segments makes the sound thin. The 250Hz--2kHz section contains the low-frequency harmonics of most instruments, and if you boost it too much, it will sound like the sound in **. If you raise 600Hz and 1kHz too much, the sound will be like the sound of a horn.

If you raise 3kHz too much, it will mask the recognition of speech, i.e., slurred speech, and make it difficult to distinguish the labial sound "mbv". If you raise 1kHz and 3kHz too much, it will make the sound metallic. Since the human ear is sensitive to this frequency band, it usually does not adjust this segment, and raising this segment too much can cause auditory fatigue.

The frequency of 2kHz--4kHz belongs to the middle frequency, if it is raised too high, it will mask the recognition sound of speech, especially if 3kHz is raised too high, it will cause hearing fatigue. 4kHz--5kHzThis is a frequency band with a sense of presence, which affects the clarity of sounds such as speech and musical instruments. Increasing this frequency band makes the sound source appear slightly closer to the listener; If the attenuation is 5kHz, the distance perception of the sound will be farther away; If you raise 6dB at around 5kHz, you will increase the sound power of the entire mixed sound, and this frequency band controls the brightness, macro brightness, and clarity of the timbre.

Generally speaking, raising these segments makes the sound loud, but not clear, and is unlikely to cause excessive tooth sounds, and the sound becomes clear when attenuated, but the sound is not loud. When adjusting the equalizer, it is best to combine the isophonic curve with the frequency response curve of the headphones. For example, if the frequency response curve of the headphones is ideal, i.e., a straight line, then the equalizer can be adjusted to a graph of the isophonic curve similar to the corresponding sound pressure level, so that the loudness of the sound heard in each frequency band is basically balanced; In fact, there is no pair of earphones The frequency response curve of the earbuds is ideally straight, and it is also affected by the different wearing conditions of each person's ears, so it takes a while to adjust the equalizer to grasp the respective sound characteristics of the ** machine and the earphones in your ears.

The speaker has a low-frequency hum that is uncomfortable to listen to, and can be eliminated in the following ways:

1. Turn off the volume potentiometer to the minimum (silent state), and the low-frequency hum continues, which means that the filter capacitor in the power supply circuit is faulty. If the capacity fails after a long period of use, it is recommended to replace the capacitor of the same type.

2. The buzzing sound is loud as the volume is turned on. In this case, check whether the audio input cable connection is in poor contact.

3. Unplug the audio cable, if there is a continuous buzzing sound, it means that the pre-voltage amplification circuit of the power amplifier is faulty. It should be repaired by a maintenance master.