The low frequency is the basis of the music in the professional orchestra. The musicians agree that the low frequency is the basis of the music and the soul of the band. In HIFI sound, low frequency is a very important sound frequency band. No low frequency, or low frequency, the content of the music to be incomplete. In the spectrum of low-IF vocals and instrument sounds, there are low-frequency components, and the low-frequency has no or less. The low-IF sounds sound, and the bottom is not solid, and the sound is floating. At this time, the sound of low IF should be distorted.
Listening to the orchestra at close range or listening to the scene at the recording position, drums, bass, bass, bassoon and other bass instruments, the low-frequency sound will be very good, shape, texture, detail, aftertaste. The spatial positioning of the bass instrument is also very good. The drum and bass low frequency sounds can be separated. The sound of the bass instrument is almost modified after recording.
The software recorded by a good sound engineer and a good recording device, the low frequency band of the music will have the same distortion as the intermediate frequency and high frequency band. Why is there a big difference in the low-frequency sound from the fever? This should be discussed from the sound system to the change of the low-frequency control force of the speaker and the change of the sound.
Why is there a big difference in the low-frequency sound from the fever?
In the theory of audio wire design: "In any frequency band, the sound system controls the sound of the speaker. When the sound changes continuously from small to large, the sound will be sinuous, virtual, solid, tight, and hard. Continuously, the sound can be recorded in any frequency band. The software performs well, and the sound is in the middle of “real.†This phenomenon is caused by the characteristics of the speaker. This feature of the speaker is the difficulty of correct tuning of the sound, and also has the target of correct tuning of the sound.â€
At every frequency point of the full frequency, the sound is adjusted to the midpoint of the "real", which is the true balance of the sound system. In the frequency-frequency coordinates, the points are connected into a line, which is the frequency-frequency curve of the sound of the system. Different matching sound systems have different frequency "real" frequency curves. The sound system has a good performance on all of its own frequency-frequency curves. At this time, the difference in sound of different sound systems is only the difference in equipment grades. The audio equipment combination of different grades, the data is reasonably matched, and the full-frequency sound has the middle point of this "real".
The influence of audio equipment on audio voltage and current
This argument, enthusiasts can be different from the sound difference of different wire materials to experience, or to do experimental demonstration. The theory of audio wire design also puts forward an argument: "The audio equipment has the function of amplifying the audio voltage and current, and the actual power amplification. The analog audio equipment has a slight difference in the ratio of audio current and audio voltage amplification at different frequency points. Unbalanced. It is this slight difference and imbalance. In the sound performance of different audio equipment, it is the difference of sound. There are high frequency floating, sharp, medium frequency thick, thin, low frequency virtual, real, soft, hard, etc. Different evaluations. In this way, there is a requirement for the sound of audio equipment to complement each other.
The control of the sound system to the speaker is the control of the sound density. If the speaker receives the same audio power, the ratio of the audio current to the audio voltage is small, and the sound is loud and the sound density is small. As the ratio of the audio current to the audio voltage gradually increases, the volume gradually decreases and the sound density gradually increases. During this process, other auditory evaluation indicators also changed. Although this ratio is very small, it is very important to properly tuned the sound. The sound system is properly tuned, and the sound density should be an important control object. The balance of sound volume is the balance of sound density. This balance has two meanings. First, the soft and hard balance of sounds at various frequencies. Second, the balance of sound density at full frequency. Compared with audio cables, the wires are in the full range of sound. The current control capability is much larger than the voltage ratio and the dispersion of the imbalance. It seems that this is not a good thing. However, from another point of view, the design and production of the sound wire is carefully matched. The correct tuning of the sound plays a decisive role.
Understand the power cord from another angle
For the power cord, try to understand from another angle: Think of the audio equipment as a black box, not to consider the internal transformer, rectification, filtering and other aspects. Only the input, amplification, and output of the audio signal are analyzed. At different frequencies, different amounts of electrical energy are required, mainly supplied by the power line. In the valley of the AC 50HZ sine wave, the rectified and filtered electric energy complements.
The role of signal lines, speaker lines
The effect on the signal line and the speaker line is relatively easy to understand, and it is also a full-frequency, audio signal current of different frequencies and different amounts of energy, which plays a role of balance control.
Audio wires have different equivalent impedances and different control forces at different frequency points. If the audio wire has the same full-frequency current passing ability, for the speaker characteristics obtained above, there will be: no matter what wire, high frequency will not have a good sound. Then there will be a thousand lines.
From the perspective of the difference in the ratio of the control ratio of the audio wire to the audio voltage and the audio current, and the correct adjustment effect on the sound, in the audio system, the audio wire is a current control type device. Since the voice coil of the speaker unit has a back electromotive force, its influence can be refracted to each link wire, and the audio wire is difficult to analyze with Om's law.
About the instrument frequency
The orchestra's performance of any music, in most cases, the sound is less than 30HZ, almost no. The ballroom's very strong "low frequency" is between 60-80HZ. The first drum of Yanhuang and the sound of the seven-sided drum are between 40-55HZ. The bass minimum frequency is 38.4hz, and in the accompaniment and solo of all the music, the bass minimum frequency sound is almost useless. Of course, the organ and piano have a minimum frequency of 30 Hz or less and are rarely used. Hugo has a sine wave frequency test disc with 25HZ, which is not heard by most people. Some enthusiasts said that there is a clear voice, I heard it, everyone in the room heard it! That's right, this is the multiplier after the nonlinear modulation of the system, 50HZ.
The speaker has a low frequency lower limit of 35HZ or lower and a negative 3dB, which can better reproduce the low frequency of all recording software. The lower limit of the low frequency of the amplifier, CD player, and decoder is much lower than that of the speaker. In this way, the acoustic low-frequency sound should be well reproduced, and the low-frequency integrated control of the acoustic wire plays a decisive role.
Said: Audio wire tuning is subtraction, there is a reduction to add. The basis is that the power amplifier must have enough power to add, subtract, and adjust.
The speaker has a good frequency, and there is a strict demand for the audio current and voltage ratio. For the output of the system, the wire combination requires reasonable passage of the audio current and reasonable attenuation. What to add less, what to reduce, this is the function of the audio wire and the correct tuning.
The two basic functions of the audio cable have two basic functions: First, the ability to truly balance the transmission of full-range audio. Second, there is a complement to each other to meet the sound of the speaker.
The sound of the sound is the same as that of the natural world. The energy carried by the low frequency is large and decreases with increasing frequency. When the power amplifier and speaker data are properly matched, the low-frequency sound of the speaker can be well reproduced. The condition is that the audio wire combination must have enough low-frequency audio current path, that is, low-frequency control force. The low-frequency sound energy is large, and the design and production of the low-frequency control force of the audio wire is a difficult and important part.
I have suggested that the inner wall of the wall should use seven strands of ten square millimeters or more of copper wire. The multi-strand line frequency-frequency curve should be flat. The copper wire of more than ten square millimeters should have ample energy supply. The basis of low-frequency tuning is better. Taiwanese enthusiasts pay special attention to the real reproduction of low-frequency audio. They believe that low-frequency sounds are reproduced in real life. For a good AC power supply, 20-square-mm multi-strand copper wire is required. It makes sense.
The sound system has a low control of the low frequency band of the speaker, and the speaker has a faint, faint low frequency, and the sound is awkward. When the control power of the low frequency band is increased, the low-frequency sound of the speaker becomes thicker, occupying a large space of the sound field. At this time, the low-frequency sound has no shape, no texture, no positioning, no direction, and the listening sound seems to be lower than the actual pitch. Feel the low frequency sound coming from the bottom of the speaker. At this time the voice is empty. When the system increases the control power of the low frequency band of the speaker, the thick sound begins to shrink, and there is density, tangible body, texture, and aftertaste, and accurate spatial positioning. At this time, the sound is real. When the system increases the control power of the low frequency band of the speaker, the low-frequency sound density increases, the shape further shrinks, and even the afterglow receives the sound shape. Feel the spatial separation is better, the listening frequency seems to be higher. But it doesn't sound very comfortable. The sound is tight at this time. Regardless of the sound, illusion, reality, and tightness, the frequency of the low-frequency sound does not change, but the subjective sense of hearing. Like the low frequency, when the mid-frequency vocal is not adjusted to the middle point of the sound "real", the sound is a bit thick, a bit fat, the mouth is bigger, a bit softer, the sound lacks density, no luster, lack of texture. There are many evaluations of the IF voice "thickness" and the female voice "爹", which is based on this.
About equipment
When the equipment is properly matched, the sound is correctly tuned, which is done by the sound wire. When the power output of the power amplifier is less than the rated power of the speaker, the sound can also be properly tuned, which is also done by the audio wire. At this time, the acoustic sound has two defects. When the volume is large, the low and medium frequency sounds become larger and the sound density becomes smaller. In the case of large dynamics, the sound will have severe cut-off distortion. Listening at a small volume, the full-range sound will perform well. This cut-off distortion, analysis of the characteristic curve of the power amplifier tube, will be very clear.
Summarize the points:
First, the key to correct tuning of the sound system is the correct combination of audio cables, and the balance control capability of full-frequency audio current.
Second, the audio wire and equipment should be able to adjust the density of the speaker's full-range sound to the middle point of "real".
Third, the adjusted sound, the listening evaluation index of the full-frequency sound has a good performance. The shape and texture of the low-frequency sound are also very good, with accurate spatial positioning.
Many audio cables have low frequency control. It is not a problem for audio wire manufacturers, but there are difficulties in the design and production of wire low frequency. It is no wonder that there are two opinions from big fevermakers: First, the sound of low-frequency sound has no directionality. Second, it is recommended that enthusiasts give the sound with a subwoofer.
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