The output power of Hi-Fi power amplifiers is affected by many factors. Firstly, this output power has a great relationship with the connected speakers. Secondly, it is related to the power quality of the power amplifier. Then there is the environment used, that is, the room. The volume of space is related.
The speaker has a parameter called sensitivity, and its unit is dB/m•W, which means the sound pressure (dB) generated when the speaker gets 1W of electric power from the speaker 1m away. If the sensitivity of a certain speaker is 90dB, then a sound pressure of 90dB at 1m requires 1W of power to push. To get 100dB of sound pressure, you need 10W of power to push it. But if the sensitivity of the speaker is 80dB (such as ATC's SCM-10), to achieve 100dB sound pressure, 100W of power is needed to drive. The sensitivity of most speakers is about 85dB-90dB. For these speakers, 10W-30W undistorted power can already have enough sound pressure.
The quality of the power amplifier itself has a great relationship with the output power that the power amplifier should have. One of the parameters of the power amplifier is called the damping coefficient, which is a parameter indicating the ability to control the speaker, but this parameter has a moderate range and is directly related to the specific speaker. In general, if the quality of a power amplifier is good, its performance parameters can be maintained at a certain level at 30 W output. Then there is no need to ask the amplifier to have a larger power output. However, if the quality of the power amplifier is not ideal, when the output power increases, it will cause deterioration of its performance parameters, then the output power of the power amplifier should have a certain margin to ensure that there are still some good parameters under the practical output power. . Under normal circumstances, when the power amplifier is a Class A output or a tube amp, there is no need to have excessive output power margin, and the output power of 20W-30W is sufficient. However, if it is a Class B power amplifier or a poor quality power amplifier, then the power output of the power amplifier should have a large margin. In addition, if the mated speakers are large-inverted, the amplifier should also have a large output power margin. When considering the output power of the power amplifier from the quality of the power amplifier itself, selecting the power margin to a larger size can actually improve the adaptation of the power amplifier and the speaker.
But here we still have to be clear, the main significance of choosing a power amplifier with a large output power is not because we need such a large sound pressure, but to improve the adaptability of the power amplifier to the speaker. If a power amplifier with a moderate output power is already able to control the speaker, then there is no need to put higher output power requirements on the amplifier.
The use environment, that is, the space volume of the room has a certain relationship with the power that the power amplifier should output. The output power we mentioned above is based on the space volume of the room below 40. If the space of the room is large, Then the output power of the amplifier should be increased.
Characteristics of the tube amplifier output stage There are three circuit types for the power output stage of the tube amplifier. One type is a push-pull output circuit with an output transformer. This type of output circuit accounts for the vast majority of tube amps. In the output transformer of the push-pull circuit, the DC component is small, and the second harmonic distortion is also small. The output power of such a circuit can be made relatively large, so the applicable range is relatively large. Generally speaking, audio enthusiasts who are interested in the sound of the amplifier are suitable for this type of output stage. However, the design and process of the output transformer of this type of power amplifier is very important. If there are deficiencies in the design and process of the output transformer, the frequency response and transient response of such a power amplifier are often not ideal. In addition, due to the constraints of the output transformer, the adaptation range of the mating speaker is small.
Another type of power output stage circuit type is a single-ended class A circuit. This type of circuit also has a transformer, but the output transformer of this type of circuit has a large DC component, and the requirements for the output transformer are higher than those of the push-pull output circuit. In addition, the requirements for the power supply are also relatively high. This type of output circuit is characterized by a relatively large number of second harmonic components. Although this is a kind of harmonic distortion, for the music signal, the second harmonic is a highly harmonious sound, so it sounds very good. This feature makes the function of this output circuit very special in the sound of the sound, especially when the power amplifier stage uses a triode, the human voice sounds very sweet, and the string music in the chamber music sounds very delicate, or, The sound of this type of amplifier is very flavorful. However, the output power of such amplifiers is not easy to make, so if the speakers used are less sensitive, they are more reluctant when delivering large orchestral music. This type of tube amp is very popular with some audio players. It is often equipped with a high-power transistor amplifier, and there is also one such amplifier. It is meant to complement each other in the tone, but this also shows that this type of amplifier The timbre characteristics are indeed touching.
There is also a type of tube amplifier output stage circuit is an OTL circuit, the so-called OTL circuit is no output transformer circuit. Modern transistor amplifier output stages are almost entirely improved versions of OTL circuits or OTL circuits. The characteristic parameters of the tube and the transistor are different from the working state. The transistor power amplifier is easy to adapt to the speaker with the impedance of 4-8, and the tube amp needs to be replaced by the output transformer to adapt to the 4-8 speaker. Since the electronic tube OTL power amplifier has removed the output transformer, it has greatly improved the technical parameters compared with the two types of circuits mentioned above. The power amplifier sound of this type of output circuit is very characteristic, compared with the previous two types of output circuits. With magnificent momentum and wide sound field, its sound is warmer and more delicate than transistor amplifiers. These amplifiers can accommodate a wide range of speaker impedances because they do not have an output transformer. However, such output stage power amplifiers have low efficiency, and the design, process, and debugging are relatively complicated. At present, the power amplifiers of such output circuits are only found in some high-end models, and it is difficult to see low-cost popular models.
The output power of Hi-Fi power amplifiers is affected by many factors. Firstly, this output power has a great relationship with the connected speakers. Secondly, it is related to the power quality of the power amplifier. Then there is the environment used, that is, the room. The volume of space is related.
The speaker has a parameter called sensitivity, and its unit is dB/m•W, which means the sound pressure (dB) generated when the speaker gets 1W of electric power from the speaker 1m away. If the sensitivity of a certain speaker is 90dB, then a sound pressure of 90dB at 1m requires 1W of power to push. To get 100dB of sound pressure, you need 10W of power to push it. But if the sensitivity of the speaker is 80dB (such as ATC's SCM-10), to achieve 100dB sound pressure, 100W of power is needed to drive. The sensitivity of most speakers is about 85dB-90dB. For these speakers, 10W-30W undistorted power can already have enough sound pressure.
The quality of the power amplifier itself has a great relationship with the output power that the power amplifier should have. One of the parameters of the power amplifier is called the damping coefficient, which is a parameter indicating the ability to control the speaker, but this parameter has a moderate range and is directly related to the specific speaker. In general, if the quality of a power amplifier is good, its performance parameters can be maintained at a certain level at 30 W output. Then there is no need to ask the amplifier to have a larger power output. However, if the quality of the power amplifier is not ideal, when the output power increases, it will cause deterioration of its performance parameters, then the output power of the power amplifier should have a certain margin to ensure that there are still some good parameters under the practical output power. . Under normal circumstances, when the power amplifier is a Class A output or a tube amp, there is no need to have excessive output power margin, and the output power of 20W-30W is sufficient. However, if it is a Class B power amplifier or a poor quality power amplifier, then the power output of the power amplifier should have a large margin. In addition, if the mated speakers are large-inverted, the amplifier should also have a large output power margin. When considering the output power of the power amplifier from the quality of the power amplifier itself, selecting the power margin to a larger size can actually improve the adaptation of the power amplifier and the speaker.
But here we still have to be clear, the main significance of choosing a power amplifier with a large output power is not because we need such a large sound pressure, but to improve the adaptability of the power amplifier to the speaker. If a power amplifier with a moderate output power is already able to control the speaker, then there is no need to put higher output power requirements on the amplifier.
The use environment, that is, the space volume of the room has a certain relationship with the power that the power amplifier should output. The output power we mentioned above is based on the space volume of the room below 40. If the space of the room is large, Then the output power of the amplifier should be increased.
Characteristics of the tube amplifier output stage There are three circuit types for the power output stage of the tube amplifier. One type is a push-pull output circuit with an output transformer. This type of output circuit accounts for the vast majority of tube amps. In the output transformer of the push-pull circuit, the DC component is small, and the second harmonic distortion is also small. The output power of such a circuit can be made relatively large, so the applicable range is relatively large. Generally speaking, audio enthusiasts who are interested in the sound of the amplifier are suitable for this type of output stage. However, the design and process of the output transformer of this type of power amplifier is very important. If there are deficiencies in the design and process of the output transformer, the frequency response and transient response of such a power amplifier are often not ideal. In addition, due to the constraints of the output transformer, the adaptation range of the mating speaker is small.
Another type of power output stage circuit type is a single-ended class A circuit. This type of circuit also has a transformer, but the output transformer of this type of circuit has a large DC component, and the requirements for the output transformer are higher than those of the push-pull output circuit. In addition, the requirements for the power supply are also relatively high. This type of output circuit is characterized by a relatively large number of second harmonic components. Although this is a kind of harmonic distortion, for the music signal, the second harmonic is a highly harmonious sound, so it sounds very good. This feature makes the function of this output circuit very special in the sound of the sound, especially when the power amplifier stage uses a triode, the human voice sounds very sweet, and the string music in the chamber music sounds very delicate, or, The sound of this type of amplifier is very flavorful. However, the output power of such amplifiers is not easy to make, so if the speakers used are less sensitive, they are more reluctant when delivering large orchestral music. This type of tube amp is very popular with some audio players. It is often equipped with a high-power transistor amplifier, and there is also one such amplifier. It is meant to complement each other in the tone, but this also shows that this type of amplifier The timbre characteristics are indeed touching.
There is also a type of tube amplifier output stage circuit is an OTL circuit, the so-called OTL circuit is no output transformer circuit. Modern transistor amplifier output stages are almost entirely improved versions of OTL circuits or OTL circuits. The characteristic parameters of the tube and the transistor are different from the working state. The transistor power amplifier is easy to adapt to the speaker with the impedance of 4-8, and the tube amp needs to be replaced by the output transformer to adapt to the 4-8 speaker. Since the electronic tube OTL power amplifier has removed the output transformer, it has greatly improved the technical parameters compared with the two types of circuits mentioned above. The power amplifier sound of this type of output circuit is very characteristic, compared with the previous two types of output circuits. With magnificent momentum and wide sound field, its sound is warmer and more delicate than transistor amplifiers. These amplifiers can accommodate a wide range of speaker impedances because they do not have an output transformer. However, such output stage power amplifiers have low efficiency, and the design, process, and debugging are relatively complicated. At present, the power amplifiers of such output circuits are only found in some high-end models, and it is difficult to see low-cost popular models.
The output power of Hi-Fi power amplifiers is affected by many factors. Firstly, this output power has a great relationship with the connected speakers. Secondly, it is related to the power quality of the power amplifier. Then there is the environment used, that is, the room. The volume of space is related.
The speaker has a parameter called sensitivity, and its unit is dB/m•W, which means the sound pressure (dB) generated when the speaker gets 1W of electric power from the speaker 1m away. If the sensitivity of a certain speaker is 90dB, then a sound pressure of 90dB at 1m requires 1W of power to push. To get 100dB of sound pressure, you need 10W of power to push it. But if the sensitivity of the speaker is 80dB (such as ATC's SCM-10), to achieve 100dB sound pressure, 100W of power is needed to drive. The sensitivity of most speakers is about 85dB-90dB. For these speakers, 10W-30W undistorted power can already have enough sound pressure.
The quality of the power amplifier itself has a great relationship with the output power that the power amplifier should have. One of the parameters of the power amplifier is called the damping coefficient, which is a parameter indicating the ability to control the speaker, but this parameter has a moderate range and is directly related to the specific speaker. In general, if the quality of a power amplifier is good, its performance parameters can be maintained at a certain level at 30 W output. Then there is no need to ask the amplifier to have a larger power output. However, if the quality of the power amplifier is not ideal, when the output power increases, it will cause deterioration of its performance parameters, then the output power of the power amplifier should have a certain margin to ensure that there are still some good parameters under the practical output power. . Under normal circumstances, when the power amplifier is a Class A output or a tube amp, there is no need to have excessive output power margin, and the output power of 20W-30W is sufficient. However, if it is a Class B power amplifier or a poor quality power amplifier, then the power output of the power amplifier should have a large margin. In addition, if the mated speakers are large-inverted, the amplifier should also have a large output power margin. When considering the output power of the power amplifier from the quality of the power amplifier itself, selecting the power margin to a larger size can actually improve the adaptation of the power amplifier and the speaker.
But here we still have to be clear, the main significance of choosing a power amplifier with a large output power is not because we need such a large sound pressure, but to improve the adaptability of the power amplifier to the speaker. If a power amplifier with a moderate output power is already able to control the speaker, then there is no need to put higher output power requirements on the amplifier.
The use environment, that is, the space volume of the room has a certain relationship with the power that the power amplifier should output. The output power we mentioned above is based on the space volume of the room below 40. If the space of the room is large, Then the output power of the amplifier should be increased.
Characteristics of the tube amplifier output stage There are three circuit types for the power output stage of the tube amplifier. One type is a push-pull output circuit with an output transformer. This type of output circuit accounts for the vast majority of tube amps. In the output transformer of the push-pull circuit, the DC component is small, and the second harmonic distortion is also small. The output power of such a circuit can be made relatively large, so the applicable range is relatively large. Generally speaking, audio enthusiasts who are interested in the sound of the amplifier are suitable for this type of output stage. However, the design and process of the output transformer of this type of power amplifier is very important. If there are deficiencies in the design and process of the output transformer, the frequency response and transient response of such a power amplifier are often not ideal. In addition, due to the constraints of the output transformer, the adaptation range of the mating speaker is small.
Another type of power output stage circuit type is a single-ended class A circuit. This type of circuit also has a transformer, but the output transformer of this type of circuit has a large DC component, and the requirements for the output transformer are higher than those of the push-pull output circuit. In addition, the requirements for the power supply are also relatively high. This type of output circuit is characterized by a relatively large number of second harmonic components. Although this is a kind of harmonic distortion, for the music signal, the second harmonic is a highly harmonious sound, so it sounds very good. This feature makes the function of this output circuit very special in the sound of the sound, especially when the power amplifier stage uses a triode, the human voice sounds very sweet, and the string music in the chamber music sounds very delicate, or, The sound of this type of amplifier is very flavorful. However, the output power of such amplifiers is not easy to make, so if the speakers used are less sensitive, they are more reluctant when delivering large orchestral music. This type of tube amp is very popular with some audio players. It is often equipped with a high-power transistor amplifier, and there is also one such amplifier. It is meant to complement each other in the tone, but this also shows that this type of amplifier The timbre characteristics are indeed touching.
There is also a type of tube amplifier output stage circuit is an OTL circuit, the so-called OTL circuit is no output transformer circuit. Modern transistor amplifier output stages are almost entirely improved versions of OTL circuits or OTL circuits. The characteristic parameters of the tube and the transistor are different from the working state. The transistor power amplifier is easy to adapt to the speaker with the impedance of 4-8, and the tube amp needs to be replaced by the output transformer to adapt to the 4-8 speaker. Since the electronic tube OTL power amplifier has removed the output transformer, it has greatly improved the technical parameters compared with the two types of circuits mentioned above. The power amplifier sound of this type of output circuit is very characteristic, compared with the previous two types of output circuits. With magnificent momentum and wide sound field, its sound is warmer and more delicate than transistor amplifiers. These amplifiers can accommodate a wide range of speaker impedances because they do not have an output transformer. However, such output stage power amplifiers have low efficiency, and the design, process, and debugging are relatively complicated. At present, the power amplifiers of such output circuits are only found in some high-end models, and it is difficult to see low-cost popular models.
The speaker has a parameter called sensitivity, and its unit is dB/m•W, which means the sound pressure (dB) generated when the speaker gets 1W of electric power from the speaker 1m away. If the sensitivity of a certain speaker is 90dB, then a sound pressure of 90dB at 1m requires 1W of power to push. To get 100dB of sound pressure, you need 10W of power to push it. But if the sensitivity of the speaker is 80dB (such as ATC's SCM-10), to achieve 100dB sound pressure, 100W of power is needed to drive. The sensitivity of most speakers is about 85dB-90dB. For these speakers, 10W-30W undistorted power can already have enough sound pressure.
The quality of the power amplifier itself has a great relationship with the output power that the power amplifier should have. One of the parameters of the power amplifier is called the damping coefficient, which is a parameter indicating the ability to control the speaker, but this parameter has a moderate range and is directly related to the specific speaker. In general, if the quality of a power amplifier is good, its performance parameters can be maintained at a certain level at 30 W output. Then there is no need to ask the amplifier to have a larger power output. However, if the quality of the power amplifier is not ideal, when the output power increases, it will cause deterioration of its performance parameters, then the output power of the power amplifier should have a certain margin to ensure that there are still some good parameters under the practical output power. . Under normal circumstances, when the power amplifier is a Class A output or a tube amp, there is no need to have excessive output power margin, and the output power of 20W-30W is sufficient. However, if it is a Class B power amplifier or a poor quality power amplifier, then the power output of the power amplifier should have a large margin. In addition, if the mated speakers are large-inverted, the amplifier should also have a large output power margin. When considering the output power of the power amplifier from the quality of the power amplifier itself, selecting the power margin to a larger size can actually improve the adaptation of the power amplifier and the speaker.
But here we still have to be clear, the main significance of choosing a power amplifier with a large output power is not because we need such a large sound pressure, but to improve the adaptability of the power amplifier to the speaker. If a power amplifier with a moderate output power is already able to control the speaker, then there is no need to put higher output power requirements on the amplifier.
The use environment, that is, the space volume of the room has a certain relationship with the power that the power amplifier should output. The output power we mentioned above is based on the space volume of the room below 40. If the space of the room is large, Then the output power of the amplifier should be increased.
Characteristics of the tube amplifier output stage There are three circuit types for the power output stage of the tube amplifier. One type is a push-pull output circuit with an output transformer. This type of output circuit accounts for the vast majority of tube amps. In the output transformer of the push-pull circuit, the DC component is small, and the second harmonic distortion is also small. The output power of such a circuit can be made relatively large, so the applicable range is relatively large. Generally speaking, audio enthusiasts who are interested in the sound of the amplifier are suitable for this type of output stage. However, the design and process of the output transformer of this type of power amplifier is very important. If there are deficiencies in the design and process of the output transformer, the frequency response and transient response of such a power amplifier are often not ideal. In addition, due to the constraints of the output transformer, the adaptation range of the mating speaker is small.
Another type of power output stage circuit type is a single-ended class A circuit. This type of circuit also has a transformer, but the output transformer of this type of circuit has a large DC component, and the requirements for the output transformer are higher than those of the push-pull output circuit. In addition, the requirements for the power supply are also relatively high. This type of output circuit is characterized by a relatively large number of second harmonic components. Although this is a kind of harmonic distortion, for the music signal, the second harmonic is a highly harmonious sound, so it sounds very good. This feature makes the function of this output circuit very special in the sound of the sound, especially when the power amplifier stage uses a triode, the human voice sounds very sweet, and the string music in the chamber music sounds very delicate, or, The sound of this type of amplifier is very flavorful. However, the output power of such amplifiers is not easy to make, so if the speakers used are less sensitive, they are more reluctant when delivering large orchestral music. This type of tube amp is very popular with some audio players. It is often equipped with a high-power transistor amplifier, and there is also one such amplifier. It is meant to complement each other in the tone, but this also shows that this type of amplifier The timbre characteristics are indeed touching.
There is also a type of tube amplifier output stage circuit is an OTL circuit, the so-called OTL circuit is no output transformer circuit. Modern transistor amplifier output stages are almost entirely improved versions of OTL circuits or OTL circuits. The characteristic parameters of the tube and the transistor are different from the working state. The transistor power amplifier is easy to adapt to the speaker with the impedance of 4-8, and the tube amp needs to be replaced by the output transformer to adapt to the 4-8 speaker. Since the electronic tube OTL power amplifier has removed the output transformer, it has greatly improved the technical parameters compared with the two types of circuits mentioned above. The power amplifier sound of this type of output circuit is very characteristic, compared with the previous two types of output circuits. With magnificent momentum and wide sound field, its sound is warmer and more delicate than transistor amplifiers. These amplifiers can accommodate a wide range of speaker impedances because they do not have an output transformer. However, such output stage power amplifiers have low efficiency, and the design, process, and debugging are relatively complicated. At present, the power amplifiers of such output circuits are only found in some high-end models, and it is difficult to see low-cost popular models.
The output power of Hi-Fi power amplifiers is affected by many factors. Firstly, this output power has a great relationship with the connected speakers. Secondly, it is related to the power quality of the power amplifier. Then there is the environment used, that is, the room. The volume of space is related.
The speaker has a parameter called sensitivity, and its unit is dB/m•W, which means the sound pressure (dB) generated when the speaker gets 1W of electric power from the speaker 1m away. If the sensitivity of a certain speaker is 90dB, then a sound pressure of 90dB at 1m requires 1W of power to push. To get 100dB of sound pressure, you need 10W of power to push it. But if the sensitivity of the speaker is 80dB (such as ATC's SCM-10), to achieve 100dB sound pressure, 100W of power is needed to drive. The sensitivity of most speakers is about 85dB-90dB. For these speakers, 10W-30W undistorted power can already have enough sound pressure.
The quality of the power amplifier itself has a great relationship with the output power that the power amplifier should have. One of the parameters of the power amplifier is called the damping coefficient, which is a parameter indicating the ability to control the speaker, but this parameter has a moderate range and is directly related to the specific speaker. In general, if the quality of a power amplifier is good, its performance parameters can be maintained at a certain level at 30 W output. Then there is no need to ask the amplifier to have a larger power output. However, if the quality of the power amplifier is not ideal, when the output power increases, it will cause deterioration of its performance parameters, then the output power of the power amplifier should have a certain margin to ensure that there are still some good parameters under the practical output power. . Under normal circumstances, when the power amplifier is a Class A output or a tube amp, there is no need to have excessive output power margin, and the output power of 20W-30W is sufficient. However, if it is a Class B power amplifier or a poor quality power amplifier, then the power output of the power amplifier should have a large margin. In addition, if the mated speakers are large-inverted, the amplifier should also have a large output power margin. When considering the output power of the power amplifier from the quality of the power amplifier itself, selecting the power margin to a larger size can actually improve the adaptation of the power amplifier and the speaker.
But here we still have to be clear, the main significance of choosing a power amplifier with a large output power is not because we need such a large sound pressure, but to improve the adaptability of the power amplifier to the speaker. If a power amplifier with a moderate output power is already able to control the speaker, then there is no need to put higher output power requirements on the amplifier.
The use environment, that is, the space volume of the room has a certain relationship with the power that the power amplifier should output. The output power we mentioned above is based on the space volume of the room below 40. If the space of the room is large, Then the output power of the amplifier should be increased.
Characteristics of the tube amplifier output stage There are three circuit types for the power output stage of the tube amplifier. One type is a push-pull output circuit with an output transformer. This type of output circuit accounts for the vast majority of tube amps. In the output transformer of the push-pull circuit, the DC component is small, and the second harmonic distortion is also small. The output power of such a circuit can be made relatively large, so the applicable range is relatively large. Generally speaking, audio enthusiasts who are interested in the sound of the amplifier are suitable for this type of output stage. However, the design and process of the output transformer of this type of power amplifier is very important. If there are deficiencies in the design and process of the output transformer, the frequency response and transient response of such a power amplifier are often not ideal. In addition, due to the constraints of the output transformer, the adaptation range of the mating speaker is small.
Another type of power output stage circuit type is a single-ended class A circuit. This type of circuit also has a transformer, but the output transformer of this type of circuit has a large DC component, and the requirements for the output transformer are higher than those of the push-pull output circuit. In addition, the requirements for the power supply are also relatively high. This type of output circuit is characterized by a relatively large number of second harmonic components. Although this is a kind of harmonic distortion, for the music signal, the second harmonic is a highly harmonious sound, so it sounds very good. This feature makes the function of this output circuit very special in the sound of the sound, especially when the power amplifier stage uses a triode, the human voice sounds very sweet, and the string music in the chamber music sounds very delicate, or, The sound of this type of amplifier is very flavorful. However, the output power of such amplifiers is not easy to make, so if the speakers used are less sensitive, they are more reluctant when delivering large orchestral music. This type of tube amp is very popular with some audio players. It is often equipped with a high-power transistor amplifier, and there is also one such amplifier. It is meant to complement each other in the tone, but this also shows that this type of amplifier The timbre characteristics are indeed touching.
There is also a type of tube amplifier output stage circuit is an OTL circuit, the so-called OTL circuit is no output transformer circuit. Modern transistor amplifier output stages are almost entirely improved versions of OTL circuits or OTL circuits. The characteristic parameters of the tube and the transistor are different from the working state. The transistor power amplifier is easy to adapt to the speaker with the impedance of 4-8, and the tube amp needs to be replaced by the output transformer to adapt to the 4-8 speaker. Since the electronic tube OTL power amplifier has removed the output transformer, it has greatly improved the technical parameters compared with the two types of circuits mentioned above. The power amplifier sound of this type of output circuit is very characteristic, compared with the previous two types of output circuits. With magnificent momentum and wide sound field, its sound is warmer and more delicate than transistor amplifiers. These amplifiers can accommodate a wide range of speaker impedances because they do not have an output transformer. However, such output stage power amplifiers have low efficiency, and the design, process, and debugging are relatively complicated. At present, the power amplifiers of such output circuits are only found in some high-end models, and it is difficult to see low-cost popular models.
The output power of Hi-Fi power amplifiers is affected by many factors. Firstly, this output power has a great relationship with the connected speakers. Secondly, it is related to the power quality of the power amplifier. Then there is the environment used, that is, the room. The volume of space is related.
The speaker has a parameter called sensitivity, and its unit is dB/m•W, which means the sound pressure (dB) generated when the speaker gets 1W of electric power from the speaker 1m away. If the sensitivity of a certain speaker is 90dB, then a sound pressure of 90dB at 1m requires 1W of power to push. To get 100dB of sound pressure, you need 10W of power to push it. But if the sensitivity of the speaker is 80dB (such as ATC's SCM-10), to achieve 100dB sound pressure, 100W of power is needed to drive. The sensitivity of most speakers is about 85dB-90dB. For these speakers, 10W-30W undistorted power can already have enough sound pressure.
The quality of the power amplifier itself has a great relationship with the output power that the power amplifier should have. One of the parameters of the power amplifier is called the damping coefficient, which is a parameter indicating the ability to control the speaker, but this parameter has a moderate range and is directly related to the specific speaker. In general, if the quality of a power amplifier is good, its performance parameters can be maintained at a certain level at 30 W output. Then there is no need to ask the amplifier to have a larger power output. However, if the quality of the power amplifier is not ideal, when the output power increases, it will cause deterioration of its performance parameters, then the output power of the power amplifier should have a certain margin to ensure that there are still some good parameters under the practical output power. . Under normal circumstances, when the power amplifier is a Class A output or a tube amp, there is no need to have excessive output power margin, and the output power of 20W-30W is sufficient. However, if it is a Class B power amplifier or a poor quality power amplifier, then the power output of the power amplifier should have a large margin. In addition, if the mated speakers are large-inverted, the amplifier should also have a large output power margin. When considering the output power of the power amplifier from the quality of the power amplifier itself, selecting the power margin to a larger size can actually improve the adaptation of the power amplifier and the speaker.
But here we still have to be clear, the main significance of choosing a power amplifier with a large output power is not because we need such a large sound pressure, but to improve the adaptability of the power amplifier to the speaker. If a power amplifier with a moderate output power is already able to control the speaker, then there is no need to put higher output power requirements on the amplifier.
The use environment, that is, the space volume of the room has a certain relationship with the power that the power amplifier should output. The output power we mentioned above is based on the space volume of the room below 40. If the space of the room is large, Then the output power of the amplifier should be increased.
Characteristics of the tube amplifier output stage There are three circuit types for the power output stage of the tube amplifier. One type is a push-pull output circuit with an output transformer. This type of output circuit accounts for the vast majority of tube amps. In the output transformer of the push-pull circuit, the DC component is small, and the second harmonic distortion is also small. The output power of such a circuit can be made relatively large, so the applicable range is relatively large. Generally speaking, audio enthusiasts who are interested in the sound of the amplifier are suitable for this type of output stage. However, the design and process of the output transformer of this type of power amplifier is very important. If there are deficiencies in the design and process of the output transformer, the frequency response and transient response of such a power amplifier are often not ideal. In addition, due to the constraints of the output transformer, the adaptation range of the mating speaker is small.
Another type of power output stage circuit type is a single-ended class A circuit. This type of circuit also has a transformer, but the output transformer of this type of circuit has a large DC component, and the requirements for the output transformer are higher than those of the push-pull output circuit. In addition, the requirements for the power supply are also relatively high. This type of output circuit is characterized by a relatively large number of second harmonic components. Although this is a kind of harmonic distortion, for the music signal, the second harmonic is a highly harmonious sound, so it sounds very good. This feature makes the function of this output circuit very special in the sound of the sound, especially when the power amplifier stage uses a triode, the human voice sounds very sweet, and the string music in the chamber music sounds very delicate, or, The sound of this type of amplifier is very flavorful. However, the output power of such amplifiers is not easy to make, so if the speakers used are less sensitive, they are more reluctant when delivering large orchestral music. This type of tube amp is very popular with some audio players. It is often equipped with a high-power transistor amplifier, and there is also one such amplifier. It is meant to complement each other in the tone, but this also shows that this type of amplifier The timbre characteristics are indeed touching.
There is also a type of tube amplifier output stage circuit is an OTL circuit, the so-called OTL circuit is no output transformer circuit. Modern transistor amplifier output stages are almost entirely improved versions of OTL circuits or OTL circuits. The characteristic parameters of the tube and the transistor are different from the working state. The transistor power amplifier is easy to adapt to the speaker with the impedance of 4-8, and the tube amp needs to be replaced by the output transformer to adapt to the 4-8 speaker. Since the electronic tube OTL power amplifier has removed the output transformer, it has greatly improved the technical parameters compared with the two types of circuits mentioned above. The power amplifier sound of this type of output circuit is very characteristic, compared with the previous two types of output circuits. With magnificent momentum and wide sound field, its sound is warmer and more delicate than transistor amplifiers. These amplifiers can accommodate a wide range of speaker impedances because they do not have an output transformer. However, such output stage power amplifiers have low efficiency, and the design, process, and debugging are relatively complicated. At present, the power amplifiers of such output circuits are only found in some high-end models, and it is difficult to see low-cost popular models.
LED Downlights,LED Down Light,COB Downlight
LED Spotlight,LED Panel Light Co., Ltd. , http://www.cnledspotlight.com