Acoustic theory answer

Q: I often hear people say that the volume knob is a reduction switch, which means that the sound cannot be amplified. What is the matter?
A: Actually it is very simple. From the structural point of view: the volume switch means VR. It is called a voltage divider on the circuit: What is a voltage divider? To put it simply, take out the required Y from an input voltage assumed to be X, and then import the unused Z into the ground. From the figure we can see that although the examples of Y and Z can be changed indefinitely, the sum of them must be equal to X. Do you say that 1:1 is not called amplification?
Q: I used an expansion machine before. When the volume is turned to 9 o'clock, the volume is very loud, but it is distorted after 9 o'clock. Now the amplifier I use increases the volume from 6 o'clock to 10 o'clock. At 12 o'clock, the volume is very good, and there is no distortion until 2 or 3 o'clock. Is this the difference between the expansion machine or the volume knob?
A: There are two possibilities for this phenomenon:
(1) The previous machine had lower power and higher gain, so it was overloaded without any two.
(2) If the power is the same and the gain is similar, there may be a difference in the volume switch. Since the human ear feels logarithmic to the volume, if the volume switch is linear with the B type, then There will be a little bit of noise when you open the sky and turn it on again. If you switch to type A, it is a logarithmic type: what the human ear feels is the increase or decrease of the volume.
Q: The volume knobs usually turn very smoothly, but there are also some gagka cards. What is the difference?
A: Generally speaking, the difference between the loud and the silent is only in the case of a small number of small marbles for positioning, and the other structures are exactly the same; however! The old horse (Mark Levinson) used on his cello (Cello) is a self-made 59-segment selector switch with a resistor as a volume switch, which is a volume switch in terms of price and quality, which is at the price and The quality is much different.
Q: Some amplifiers control the volume of the left and right channels separately. Is this good?
A: There are two benefits:
(1) Theoretically, crosstalk can be reduced.
(2) It can save the double price potentiometer and balance potentiometer with higher price.
Q: If the volume knob is a faucet, the water source is stored in it. The knob is just a switch and there is no amplification. So whether the 50 watt amplifier and the 200 watt amplifier have different volume specifications. What about the knob? And what about the K ohms on the switch?
A: From the first question, we can see that the volume switch changes only a relative ratio and has nothing to do with its value; the above K ohm is its value, which is the impedance matching between the two circuits before and after. The requirements are usually determined by higher than the impedance matching requirements between the secondary and secondary circuits, usually higher than the output impedance of the previous stage and lower than the input impedance of the latter stage.
Q: There used to be a pop slider volume control for a while, and the console of my studio was using a slider volume controller. Why should I use it for professional equipment? Is it better performance? Why not use a home machine?
A: There are two reasons why professional equipment uses a sliding controller:
(A) At a glance: you can know the location of each controller at a glance.
(2) Convenient control: When it is necessary to adjust several controllers at the same time, the two hands are enough, and it is not necessary to use both hands and feet. As for quality: the controller for advanced equipment is indeed better than the average! However, the general small console and home equipment are not the same thing, plus the sliding type is slightly higher than the rotary price and the mechanical strength is not good, recently, in addition to the graphic equalizer Rarely appeared.
Q: My volume knob sometimes has a click, why? I heard people say that it is ok to buy a bottle of water on Zhonghua Road. Is this correct?
A: There are two sources of volume noise:
(1) The output of the previous stage has DC.
(2) The resistor body is worn for a long time.
In the first case, even if the resurrection agent is sprayed, it is useless. If it is only slightly worn, the spray re-activator can be dragged for a while. The preferred method is to disintegrate and then wash with an organic solvent. Of course, it is better to replace it.
Q: I often hear people say that a good volume knob is worth a few yuan, and an ordinary one can be bought as long as the number of yuan is picked up. What is the difference between them?
A: There are several factors that determine the price of a controller:
(1) Noise: Generally speaking, the switch type murmur is the lowest, the metal film is the second, and the carbon film is the highest. As for the British PRG used by Mark-Levinson and Kreell, it is made of conductive rubber, and the noise is between switch type and membrane. between.
(2) Linkage error: The more balanced the channel is, the more expensive it is.
But is it expensive? not necessarily! Have you heard of Tokyo Light Sound? It’s advanced enough! It’s not cheap, what about the sound? "false fake"! How to say? Have you heard of a CD called Impact? There is a Starker cdllo inside, is it good? If you feel that the world is first class, please change your name to be a dog or go to sell books (three books and fifty-six). Peace of mind as an emperor enjoy "East Asian Co-Prosperity"! If you have enough evolution, please listen to Mercury's Starker! Free from the National Concert Hall, the deer is a joke. There is also a digression, in the 9th issue of a SP-9 improvement note: "Replace the ALPS carbon variable resistor with the same value.....", if you have a Data Book in your hand and understand (The important thing!) It is known that the so-called "carbon varistor" is a metal film varistor that is uncompromising!
Q: I often hear people say that the volume knob is a reduction switch, which means that the sound cannot be amplified. What is the matter?
A: Actually it is very simple. From the structural point of view: the volume switch means VR. It is called a voltage divider on the circuit: What is a voltage divider? To put it simply, take out the required Y from an input voltage assumed to be X, and then import the unused Z into the ground. From the figure we can see that although the examples of Y and Z can be changed indefinitely, the sum of them must be equal to X. Do you say that 1:1 is not called amplification?
Q: I used an expansion machine before. When the volume is turned to 9 o'clock, the volume is very loud, but it is distorted after 9 o'clock. Now the amplifier I use increases the volume from 6 o'clock to 10 o'clock. At 12 o'clock, the volume is very good, and there is no distortion until 2 or 3 o'clock. Is this the difference between the expansion machine or the volume knob?
A: There are two possibilities for this phenomenon:
(1) The previous machine had lower power and higher gain, so it was overloaded without any two.
(2) If the power is the same and the gain is similar, there may be a difference in the volume switch. Since the human ear feels logarithmic to the volume, if the volume switch is linear with the B type, then There will be a little bit of noise when you open the sky and turn it on again. If you switch to type A, it is a logarithmic type: what the human ear feels is the increase or decrease of the volume.
Q: The volume knobs usually turn very smoothly, but there are also some gagka cards. What is the difference?
A: Generally speaking, the difference between the loud and the silent is only in the case of a small number of small marbles for positioning, and the other structures are exactly the same; however! The old horse (Mark Levinson) used on his cello (Cello) is a self-made 59-segment selector switch with a resistor as a volume switch, which is a volume switch in terms of price and quality, which is at the price and The quality is much different.
Q: Some amplifiers control the volume of the left and right channels separately. Is this good?
A: There are two benefits:
(1) Theoretically, crosstalk can be reduced.
(2) It can save the double price potentiometer and balance potentiometer with higher price.
Q: If the volume knob is a faucet, the water source is stored in it. The knob is just a switch and there is no amplification. So whether the 50 watt amplifier and the 200 watt amplifier have different volume specifications. What about the knob? And what about the K ohms on the switch?
A: From the first question, we can see that the volume switch changes only a relative ratio and has nothing to do with its value; the above K ohm is its value, which is the impedance matching between the two circuits before and after. The requirements are usually determined by higher than the impedance matching requirements between the secondary and secondary circuits, usually higher than the output impedance of the previous stage and lower than the input impedance of the latter stage.
Q: There used to be a pop slider volume control for a while, and the console of my studio was using a slider volume controller. Why should I use it for professional equipment? Is it better performance? Why not use a home machine?
A: There are two reasons why professional equipment uses a sliding controller:
(A) At a glance: you can know the location of each controller at a glance.
(2) Convenient control: When it is necessary to adjust several controllers at the same time, the two hands are enough, and it is not necessary to use both hands and feet. As for quality: the controller for advanced equipment is indeed better than the average! However, the general small console and home equipment are not the same thing, plus the sliding type is slightly higher than the rotary price and the mechanical strength is not good, recently, in addition to the graphic equalizer Rarely appeared.
Q: My volume knob sometimes has a click, why? I heard people say that it is ok to buy a bottle of water on Zhonghua Road. Is this correct?
A: There are two sources of volume noise:
(1) The output of the previous stage has DC.
(2) The resistor body is worn for a long time.
In the first case, even if the resurrection agent is sprayed, it is useless. If it is only slightly worn, the spray re-activator can be dragged for a while. The preferred method is to disintegrate and then wash with an organic solvent. Of course, it is better to replace it.
Q: I often hear people say that a good volume knob is worth a few yuan, and an ordinary one can be bought as long as the number of yuan is picked up. What is the difference between them?
A: There are several factors that determine the price of a controller:
(1) Noise: Generally speaking, the switch type murmur is the lowest, the metal film is the second, and the carbon film is the highest. As for the British PRG used by Mark-Levinson and Kreell, it is made of conductive rubber, and the noise is between switch type and membrane. between.
(2) Linkage error: The more balanced the channel is, the more expensive it is.
But is it expensive? not necessarily! Have you heard of Tokyo Light Sound? It’s advanced enough! It’s not cheap, what about the sound? "false fake"! How to say? Have you heard of a CD called Impact? There is a Starker cdllo inside, is it good? If you feel that the world is first class, please change your name to be a dog or go to sell books (three books and fifty-six). Peace of mind as an emperor enjoy "East Asian Co-Prosperity"! If you have enough evolution, please listen to Mercury's Starker! Free from the National Concert Hall, the deer is a joke. There is also a digression, in the 9th issue of a SP-9 improvement note: "Replace the ALPS carbon variable resistor with the same value.....", if you have a Data Book in your hand and understand (The important thing!) It is known that the so-called "carbon varistor" is a metal film varistor that is uncompromising!
Q: I often hear people say that the volume knob is a reduction switch, which means that the sound cannot be amplified. What is the matter?
A: Actually it is very simple. From the structural point of view: the volume switch means VR. It is called a voltage divider on the circuit: What is a voltage divider? To put it simply, take out the required Y from an input voltage assumed to be X, and then import the unused Z into the ground. From the figure we can see that although the examples of Y and Z can be changed indefinitely, the sum of them must be equal to X. Do you say that 1:1 is not called amplification?
Q: I used an expansion machine before. When the volume is turned to 9 o'clock, the volume is very loud, but it is distorted after 9 o'clock. Now the amplifier I use increases the volume from 6 o'clock to 10 o'clock. At 12 o'clock, the volume is very good, and there is no distortion until 2 or 3 o'clock. Is this the difference between the expansion machine or the volume knob?
A: There are two possibilities for this phenomenon:
(1) The previous machine had lower power and higher gain, so it was overloaded without any two.
(2) If the power is the same and the gain is similar, there may be a difference in the volume switch. Since the human ear feels logarithmic to the volume, if the volume switch is linear with the B type, then There will be a little bit of noise when you open the sky and turn it on again. If you switch to type A, it is a logarithmic type: what the human ear feels is the increase or decrease of the volume.
Q: The volume knobs usually turn very smoothly, but there are also some gagka cards. What is the difference?
A: Generally speaking, the difference between the loud and the silent is only in the case of a small number of small marbles for positioning, and the other structures are exactly the same; however! The old horse (Mark Levinson) used on his cello (Cello) is a self-made 59-segment selector switch with a resistor as a volume switch, which is a volume switch in terms of price and quality, which is at the price and The quality is much different.
Q: Some amplifiers control the volume of the left and right channels separately. Is this good?
A: There are two benefits:
(1) Theoretically, crosstalk can be reduced.
(2) It can save the double price potentiometer and balance potentiometer with higher price.
Q: If the volume knob is a faucet, the water source is stored in it. The knob is just a switch and there is no amplification. So whether the 50 watt amplifier and the 200 watt amplifier have different volume specifications. What about the knob? And what about the K ohms on the switch?
A: From the first question, we can see that the volume switch changes only a relative ratio and has nothing to do with its value; the above K ohm is its value, which is the impedance matching between the two circuits before and after. The requirements are usually determined by higher than the impedance matching requirements between the secondary and secondary circuits, usually higher than the output impedance of the previous stage and lower than the input impedance of the latter stage.
Q: There used to be a pop slider volume control for a while, and the console of my studio was using a slider volume controller. Why should I use it for professional equipment? Is it better performance? Why not use a home machine?
A: There are two reasons why professional equipment uses a sliding controller:
(A) At a glance: you can know the location of each controller at a glance.
(2) Convenient control: When it is necessary to adjust several controllers at the same time, the two hands are enough, and it is not necessary to use both hands and feet. As for quality: the controller for advanced equipment is indeed better than the average! However, the general small console and home equipment are not the same thing, plus the sliding type is slightly higher than the rotary price and the mechanical strength is not good, recently, in addition to the graphic equalizer Rarely appeared.
Q: My volume knob sometimes has a click, why? I heard people say that it is ok to buy a bottle of water on Zhonghua Road. Is this correct?
A: There are two sources of volume noise:
(1) The output of the previous stage has DC.
(2) The resistor body is worn for a long time.
In the first case, even if the resurrection agent is sprayed, it is useless. If it is only slightly worn, the spray re-activator can be dragged for a while. The preferred method is to disintegrate and then wash with an organic solvent. Of course, it is better to replace it.
Q: I often hear people say that a good volume knob is worth a few yuan, and an ordinary one can be bought as long as the number of yuan is picked up. What is the difference between them?
A: There are several factors that determine the price of a controller:
(1) Noise: Generally speaking, the switch type murmur is the lowest, the metal film is the second, and the carbon film is the highest. As for the British PRG used by Mark-Levinson and Kreell, it is made of conductive rubber, and the noise is between switch type and membrane. between.
(2) Linkage error: The more balanced the channel is, the more expensive it is.
But is it expensive? not necessarily! Have you heard of Tokyo Light Sound? It’s advanced enough! It’s not cheap, what about the sound? "false fake"! How to say? Have you heard of a CD called Impact? There is a Starker cdllo inside, is it good? If you feel that the world is first class, please change your name to be a dog or go to sell books (three books and fifty-six). Peace of mind as an emperor enjoy "East Asian Co-Prosperity"! If you have enough evolution, please listen to Mercury's Starker! Free from the National Concert Hall, the deer is a joke. There is also a digression, in the 9th issue of a SP-9 improvement note: "Replace the ALPS carbon variable resistor with the same value.....", if you have a Data Book in your hand and understand (The important thing!) It is known that the so-called "carbon varistor" is a metal film varistor that is uncompromising!

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