The characteristics of open-air audio selection and sound system design are very wide. According to the different places of the open-air audio and the difference in environment, it is advisable to use the temporary installation mobile type. Follow the principles of practicality and application, so that the purchased equipment is not idle, fully function and simple operation, etc., and the consistency of the performance of the equipment files should be maintained to avoid the phenomenon of “not matchingâ€. As an open-air audio, the selection also takes into account the stability and durability of the work in harsh environments.
As with other audio system designs, the open-air audio should master the configuration ratio when establishing the power configuration of the speakers and amplifiers. If the power "power" of the power amplifier is insufficient, it will not be able to cope with the sudden peak of the moment, resulting in a loud volume and a rough sound quality. If the instantaneous peak volume is 10dB of normal volume, a 100W amplifier is required to play back the average power of 10W. When the mixer pusher is too large or the microphone sound feedback causes self-excited howling, it is also easy to damage the speaker. For outdoor small sound systems, a strong power reserve is required. Generally, the outdoor sound field is increased by 3dB sound pressure level, and the power needs to be increased by 10 times. According to the sound pressure level = 20log (P/P0), the specific value of the sound field can be calculated. When the continuous undistorted power of the power amplifier is 1.2 to 1.5 times the rated power of the speaker, the equipment can be safely and stably operated.
Early-stage sound preparation is different from other fixed-type audio systems. The preparation of open-air audio is especially important, including familiarity with the site, power supply, and cable laying. When conditions permit, you should familiarize yourself with the geographical location of the venue one day in advance and establish the sound system layout points. On the day of the event, make preparations in advance to ensure that nothing is lost.
The sound system energy comes from the grid circuit, the power circuit is faulty, the lighter makes the system unable to make a sound, and the heavy one will destroy the audio equipment. Therefore, the power supply circuit should be guaranteed to work properly. For remote areas, temporary generators are not permitted if conditions permit, and should be protected by specialized personnel. Before adjusting the work, use a multimeter to measure the voltage of all power outlets, and establish a good grounding of the equipment and the same phase of the power supply wiring. Poor grounding or phase errors often cause interference and noise noise intrusion, resulting in deterioration of acoustic performance.
All kinds of cable laying must be accurately placed according to the layout position. Care should be taken when laying the wire. Try to make the mark as obvious. As the basis for finding the installation and repair, do not mess with the cable. At the same time, each cable should leave enough margin, and the connection of each equipment connector and plug connector is correct. When releasing the line, carefully check each line for damage or poor quality, and replace it as soon as possible. For the laid cables, especially the speaker lines, special personnel must be protected to avoid malfunctions caused by frequent disconnection and short circuit of the speaker wires due to frequent activities of the venue personnel, and even damage the power amplifier. Outdoor sound adjustment and precautions Outdoors, sound pressure will decrease with increasing distance. In order to overcome this problem, it is necessary to raise the position of the speaker, and it is possible to hoist the speaker. Shorten the distance between the front and the back. At the same time, it can also overcome the fact that the sound waves of the low-level speakers are absorbed by the front-view audience, which makes the high-end audio loss large and affects the rear audience. For speaker types, outdoor dedicated speakers or mid-high horn speakers are recommended.
After confirming that the speaker position, power supply, and cable are connected correctly, you can turn on the sound source (CD, VCD, MD, VCR), the mixer, and the rear amplifier (in reverse order), and then adjust the mixer.
(1) Adjust the amplifier volume control potentiometer to the maximum position; the mixer accompaniment music and microphone splitter putter is set to 0dB; the GAIN input gain of each branch is in the adjusted position; the mixer total putter is at the minimum position ; the mixer sound quality compensation knob is in the middle position;
(2) Debug the accompaniment channel, select the familiar track, pay attention to the moderate volume, and repeatedly adjust the GAIN gain and EQ sound quality compensation until the sound effect is satisfactory.
(3) Debug the microphone channel (the split of the microphone channel in the mixer must be fixed from left to right according to the venue). For the condenser microphone, the mixer should provide +48V power. When the microphone volume is adjusted, the splitter is at 0dB, the GAIN input gain is adjusted, and the PEAK (peak level indicator) occasionally flashes.
Outdoors, on-site noise and acoustic feedback (howling) must be taken seriously. For the former, a high-sensitivity microphone can be selected. When the noise of the breathing noise and the wind is obvious, a windshield should be added, and the GAIN knob should be adjusted to ensure that the gain is not reduced. Practice has proved that the sponge windshield does not hurt the sound, the high frequency has slipped, but can be corrected by the mixer EQ. There are many reasons for causing acoustic feedback, even high-density equipment is inevitable. In practice, as long as some measures are taken, they can still be suppressed.
(1) Keep the microphone away from the speaker, and the microphone position is not as far as possible in the radiation area of ​​the speaker sound.
(2) According to the scene, reduce the volume of the microphone channel appropriately. If there is ringing, reduce the volume in time. When the host or other personnel have to pass the front of the speaker, pay attention to the volume control.
(3) Compensate the sound quality through the mixer. When debugging the demonstration performance, increase the volume until the system just generates self-excitation, and then adjust the equalizer adjustment knob from the low frequency one by one to effectively eliminate the frequency of self-excited howling. According to experience, for the frequency at which self-excited resonance occurs, it can be pulled down by 3 to 5 dB at this frequency point. It is very difficult to eliminate acoustic feedback fundamentally. In addition to adding feedback suppressors, pressure limiters, and frequency shifters, you should also be proficient in the performance and accumulated experience of various equipments. The characteristics of open-air audio selection and sound system design are very wide. According to the different places of the open-air audio and the difference in environment, it is advisable to use the temporary installation mobile type. Follow the principles of practicality and application, so that the purchased equipment is not idle, fully function and simple operation, etc., and the consistency of the performance of the equipment files should be maintained to avoid the phenomenon of “not matchingâ€. As an open-air audio, the selection also takes into account the stability and durability of the work in harsh environments.
As with other audio system designs, the open-air audio should master the configuration ratio when establishing the power configuration of the speakers and amplifiers. If the power "power" of the power amplifier is insufficient, it will not be able to cope with the sudden peak of the moment, resulting in a loud volume and a rough sound quality. If the instantaneous peak volume is 10dB of normal volume, a 100W amplifier is required to play back the average power of 10W. When the mixer pusher is too large or the microphone sound feedback causes self-excited howling, it is also easy to damage the speaker. For outdoor small sound systems, a strong power reserve is required. Generally, the outdoor sound field is increased by 3dB sound pressure level, and the power needs to be increased by 10 times. According to the sound pressure level = 20log (P/P0), the specific value of the sound field can be calculated. When the continuous undistorted power of the power amplifier is 1.2 to 1.5 times the rated power of the speaker, the equipment can be safely and stably operated.
Early-stage sound preparation is different from other fixed-type audio systems. The preparation of open-air audio is especially important, including familiarity with the site, power supply, and cable laying. When conditions permit, you should familiarize yourself with the geographical location of the venue one day in advance and establish the sound system layout points. On the day of the event, make preparations in advance to ensure that nothing is lost.
The sound system energy comes from the grid circuit, the power circuit is faulty, the lighter makes the system unable to make a sound, and the heavy one will destroy the audio equipment. Therefore, the power supply circuit should be guaranteed to work properly. For remote areas, temporary generators are not permitted if conditions permit, and should be protected by specialized personnel. Before adjusting the work, use a multimeter to measure the voltage of all power outlets, and establish a good grounding of the equipment and the same phase of the power supply wiring. Poor grounding or phase errors often cause interference and noise noise intrusion, resulting in deterioration of acoustic performance.
All kinds of cable laying must be accurately placed according to the layout position. Care should be taken when laying the wire. Try to make the mark as obvious. As the basis for finding the installation and repair, do not mess with the cable. At the same time, each cable should leave enough margin, and the connection of each equipment connector and plug connector is correct. When releasing the line, carefully check each line for damage or poor quality, and replace it as soon as possible. For the laid cables, especially the speaker lines, special personnel must be protected to avoid malfunctions caused by frequent disconnection and short circuit of the speaker wires due to frequent activities of the venue personnel, and even damage the power amplifier. Outdoor sound adjustment and precautions Outdoors, sound pressure will decrease with increasing distance. In order to overcome this problem, it is necessary to raise the position of the speaker, and it is possible to hoist the speaker. Shorten the distance between the front and the back. At the same time, it can also overcome the fact that the sound waves of the low-level speakers are absorbed by the front-view audience, which makes the high-end audio loss large and affects the rear audience. For speaker types, outdoor dedicated speakers or mid-high horn speakers are recommended.
After confirming that the speaker position, power supply, and cable are connected correctly, you can turn on the sound source (CD, VCD, MD, VCR), the mixer, and the rear amplifier (in reverse order), and then adjust the mixer.
(1) Adjust the amplifier volume control potentiometer to the maximum position; the mixer accompaniment music and microphone splitter putter is set to 0dB; the GAIN input gain of each branch is in the adjusted position; the mixer total putter is at the minimum position ; the mixer sound quality compensation knob is in the middle position;
(2) Debug the accompaniment channel, select the familiar track, pay attention to the moderate volume, and repeatedly adjust the GAIN gain and EQ sound quality compensation until the sound effect is satisfactory.
(3) Debug the microphone channel (the split of the microphone channel in the mixer must be fixed from left to right according to the venue). For the condenser microphone, the mixer should provide +48V power. When the microphone volume is adjusted, the splitter is at 0dB, the GAIN input gain is adjusted, and the PEAK (peak level indicator) occasionally flashes.
Outdoors, on-site noise and acoustic feedback (howling) must be taken seriously. For the former, a high-sensitivity microphone can be selected. When the noise of the breathing noise and the wind is obvious, a windshield should be added, and the GAIN knob should be adjusted to ensure that the gain is not reduced. Practice has proved that the sponge windshield does not hurt the sound, the high frequency has slipped, but can be corrected by the mixer EQ. There are many reasons for causing acoustic feedback, even high-density equipment is inevitable. In practice, as long as some measures are taken, they can still be suppressed.
(1) Keep the microphone away from the speaker, and the microphone position is not as far as possible in the radiation area of ​​the speaker sound.
(2) According to the scene, reduce the volume of the microphone channel appropriately. If there is ringing, reduce the volume in time. When the host or other personnel have to pass the front of the speaker, pay attention to the volume control.
(3) Compensate the sound quality through the mixer. When debugging the demonstration performance, increase the volume until the system just generates self-excitation, and then adjust the equalizer adjustment knob from the low frequency one by one to effectively eliminate the frequency of self-excited howling. According to experience, for the frequency at which self-excited resonance occurs, it can be pulled down by 3 to 5 dB at this frequency point. It is very difficult to eliminate acoustic feedback fundamentally. In addition to adding feedback suppressors, pressure limiters, and frequency shifters, you should also be proficient in the performance and accumulated experience of various equipments. The characteristics of open-air audio selection and sound system design are very wide. According to the different places of the open-air audio and the difference in environment, it is advisable to use the temporary installation mobile type. Follow the principles of practicality and application, so that the purchased equipment is not idle, fully function and simple operation, etc., and the consistency of the performance of the equipment files should be maintained to avoid the phenomenon of “not matchingâ€. As an open-air audio, the selection also takes into account the stability and durability of the work in harsh environments.
As with other audio system designs, the open-air audio should master the configuration ratio when establishing the power configuration of the speakers and amplifiers. If the power "power" of the power amplifier is insufficient, it will not be able to cope with the sudden peak of the moment, resulting in a loud volume and a rough sound quality. If the instantaneous peak volume is 10dB of normal volume, a 100W amplifier is required to play back the average power of 10W. When the mixer pusher is too large or the microphone sound feedback causes self-excited howling, it is also easy to damage the speaker. For outdoor small sound systems, a strong power reserve is required. Generally, the outdoor sound field is increased by 3dB sound pressure level, and the power needs to be increased by 10 times. According to the sound pressure level = 20log (P/P0), the specific value of the sound field can be calculated. When the continuous undistorted power of the power amplifier is 1.2 to 1.5 times the rated power of the speaker, the equipment can be safely and stably operated.
Early-stage sound preparation is different from other fixed-type audio systems. The preparation of open-air audio is especially important, including familiarity with the site, power supply, and cable laying. When conditions permit, you should familiarize yourself with the geographical location of the venue one day in advance and establish the sound system layout points. On the day of the event, make preparations in advance to ensure that nothing is lost.
The sound system energy comes from the grid circuit, the power circuit is faulty, the lighter makes the system unable to make a sound, and the heavy one will destroy the audio equipment. Therefore, the power supply circuit should be guaranteed to work properly. For remote areas, temporary generators are not permitted if conditions permit, and should be protected by specialized personnel. Before adjusting the work, use a multimeter to measure the voltage of all power outlets, and establish a good grounding of the equipment and the same phase of the power supply wiring. Poor grounding or phase errors often cause interference and noise noise intrusion, resulting in deterioration of acoustic performance.
All kinds of cable laying must be accurately placed according to the layout position. Care should be taken when laying the wire. Try to make the mark as obvious. As the basis for finding the installation and repair, do not mess with the cable. At the same time, each cable should leave enough margin, and the connection of each equipment connector and plug connector is correct. When releasing the line, carefully check each line for damage or poor quality, and replace it as soon as possible. For the laid cables, especially the speaker lines, special personnel must be protected to avoid malfunctions caused by frequent disconnection and short circuit of the speaker wires due to frequent activities of the venue personnel, and even damage the power amplifier. Outdoor sound adjustment and precautions Outdoors, sound pressure will decrease with increasing distance. In order to overcome this problem, it is necessary to raise the position of the speaker, and it is possible to hoist the speaker. Shorten the distance between the front and the back. At the same time, it can also overcome the fact that the sound waves of the low-level speakers are absorbed by the front-view audience, which makes the high-end audio loss large and affects the rear audience. For speaker types, outdoor dedicated speakers or mid-high horn speakers are recommended.
After confirming that the speaker position, power supply, and cable are connected correctly, you can turn on the sound source (CD, VCD, MD, VCR), the mixer, and the rear amplifier (in reverse order), and then adjust the mixer.
(1) Adjust the amplifier volume control potentiometer to the maximum position; the mixer accompaniment music and microphone splitter putter is set to 0dB; the GAIN input gain of each branch is in the adjusted position; the mixer total putter is at the minimum position ; the mixer sound quality compensation knob is in the middle position;
(2) Debug the accompaniment channel, select the familiar track, pay attention to the moderate volume, and repeatedly adjust the GAIN gain and EQ sound quality compensation until the sound effect is satisfactory.
(3) Debug the microphone channel (the split of the microphone channel in the mixer must be fixed from left to right according to the venue). For the condenser microphone, the mixer should provide +48V power. When the microphone volume is adjusted, the splitter is at 0dB, the GAIN input gain is adjusted, and the PEAK (peak level indicator) occasionally flashes.
Outdoors, on-site noise and acoustic feedback (howling) must be taken seriously. For the former, a high-sensitivity microphone can be selected. When the noise of the breathing noise and the wind is obvious, a windshield should be added, and the GAIN knob should be adjusted to ensure that the gain is not reduced. Practice has proved that the sponge windshield does not hurt the sound, the high frequency has slipped, but can be corrected by the mixer EQ. There are many reasons for causing acoustic feedback, even high-density equipment is inevitable. In practice, as long as some measures are taken, they can still be suppressed.
(1) Keep the microphone away from the speaker, and the microphone position is not as far as possible in the radiation area of ​​the speaker sound.
(2) According to the scene, reduce the volume of the microphone channel appropriately. If there is ringing, reduce the volume in time. When the host or other personnel have to pass the front of the speaker, pay attention to the volume control.
(3) Compensate the sound quality through the mixer. When debugging the demonstration performance, increase the volume until the system just generates self-excitation, and then adjust the equalizer adjustment knob from the low frequency one by one to effectively eliminate the frequency of self-excited howling. According to experience, for the frequency at which self-excited resonance occurs, it can be pulled down by 3 to 5 dB at this frequency point. It is very difficult to eliminate acoustic feedback fundamentally. In addition to adding feedback suppressors, pressure limiters, and frequency shifters, you should also be proficient in the performance and accumulated experience of various equipments.
As with other audio system designs, the open-air audio should master the configuration ratio when establishing the power configuration of the speakers and amplifiers. If the power "power" of the power amplifier is insufficient, it will not be able to cope with the sudden peak of the moment, resulting in a loud volume and a rough sound quality. If the instantaneous peak volume is 10dB of normal volume, a 100W amplifier is required to play back the average power of 10W. When the mixer pusher is too large or the microphone sound feedback causes self-excited howling, it is also easy to damage the speaker. For outdoor small sound systems, a strong power reserve is required. Generally, the outdoor sound field is increased by 3dB sound pressure level, and the power needs to be increased by 10 times. According to the sound pressure level = 20log (P/P0), the specific value of the sound field can be calculated. When the continuous undistorted power of the power amplifier is 1.2 to 1.5 times the rated power of the speaker, the equipment can be safely and stably operated.
Early-stage sound preparation is different from other fixed-type audio systems. The preparation of open-air audio is especially important, including familiarity with the site, power supply, and cable laying. When conditions permit, you should familiarize yourself with the geographical location of the venue one day in advance and establish the sound system layout points. On the day of the event, make preparations in advance to ensure that nothing is lost.
The sound system energy comes from the grid circuit, the power circuit is faulty, the lighter makes the system unable to make a sound, and the heavy one will destroy the audio equipment. Therefore, the power supply circuit should be guaranteed to work properly. For remote areas, temporary generators are not permitted if conditions permit, and should be protected by specialized personnel. Before adjusting the work, use a multimeter to measure the voltage of all power outlets, and establish a good grounding of the equipment and the same phase of the power supply wiring. Poor grounding or phase errors often cause interference and noise noise intrusion, resulting in deterioration of acoustic performance.
All kinds of cable laying must be accurately placed according to the layout position. Care should be taken when laying the wire. Try to make the mark as obvious. As the basis for finding the installation and repair, do not mess with the cable. At the same time, each cable should leave enough margin, and the connection of each equipment connector and plug connector is correct. When releasing the line, carefully check each line for damage or poor quality, and replace it as soon as possible. For the laid cables, especially the speaker lines, special personnel must be protected to avoid malfunctions caused by frequent disconnection and short circuit of the speaker wires due to frequent activities of the venue personnel, and even damage the power amplifier. Outdoor sound adjustment and precautions Outdoors, sound pressure will decrease with increasing distance. In order to overcome this problem, it is necessary to raise the position of the speaker, and it is possible to hoist the speaker. Shorten the distance between the front and the back. At the same time, it can also overcome the fact that the sound waves of the low-level speakers are absorbed by the front-view audience, which makes the high-end audio loss large and affects the rear audience. For speaker types, outdoor dedicated speakers or mid-high horn speakers are recommended.
After confirming that the speaker position, power supply, and cable are connected correctly, you can turn on the sound source (CD, VCD, MD, VCR), the mixer, and the rear amplifier (in reverse order), and then adjust the mixer.
(1) Adjust the amplifier volume control potentiometer to the maximum position; the mixer accompaniment music and microphone splitter putter is set to 0dB; the GAIN input gain of each branch is in the adjusted position; the mixer total putter is at the minimum position ; the mixer sound quality compensation knob is in the middle position;
(2) Debug the accompaniment channel, select the familiar track, pay attention to the moderate volume, and repeatedly adjust the GAIN gain and EQ sound quality compensation until the sound effect is satisfactory.
(3) Debug the microphone channel (the split of the microphone channel in the mixer must be fixed from left to right according to the venue). For the condenser microphone, the mixer should provide +48V power. When the microphone volume is adjusted, the splitter is at 0dB, the GAIN input gain is adjusted, and the PEAK (peak level indicator) occasionally flashes.
Outdoors, on-site noise and acoustic feedback (howling) must be taken seriously. For the former, a high-sensitivity microphone can be selected. When the noise of the breathing noise and the wind is obvious, a windshield should be added, and the GAIN knob should be adjusted to ensure that the gain is not reduced. Practice has proved that the sponge windshield does not hurt the sound, the high frequency has slipped, but can be corrected by the mixer EQ. There are many reasons for causing acoustic feedback, even high-density equipment is inevitable. In practice, as long as some measures are taken, they can still be suppressed.
(1) Keep the microphone away from the speaker, and the microphone position is not as far as possible in the radiation area of ​​the speaker sound.
(2) According to the scene, reduce the volume of the microphone channel appropriately. If there is ringing, reduce the volume in time. When the host or other personnel have to pass the front of the speaker, pay attention to the volume control.
(3) Compensate the sound quality through the mixer. When debugging the demonstration performance, increase the volume until the system just generates self-excitation, and then adjust the equalizer adjustment knob from the low frequency one by one to effectively eliminate the frequency of self-excited howling. According to experience, for the frequency at which self-excited resonance occurs, it can be pulled down by 3 to 5 dB at this frequency point. It is very difficult to eliminate acoustic feedback fundamentally. In addition to adding feedback suppressors, pressure limiters, and frequency shifters, you should also be proficient in the performance and accumulated experience of various equipments. The characteristics of open-air audio selection and sound system design are very wide. According to the different places of the open-air audio and the difference in environment, it is advisable to use the temporary installation mobile type. Follow the principles of practicality and application, so that the purchased equipment is not idle, fully function and simple operation, etc., and the consistency of the performance of the equipment files should be maintained to avoid the phenomenon of “not matchingâ€. As an open-air audio, the selection also takes into account the stability and durability of the work in harsh environments.
As with other audio system designs, the open-air audio should master the configuration ratio when establishing the power configuration of the speakers and amplifiers. If the power "power" of the power amplifier is insufficient, it will not be able to cope with the sudden peak of the moment, resulting in a loud volume and a rough sound quality. If the instantaneous peak volume is 10dB of normal volume, a 100W amplifier is required to play back the average power of 10W. When the mixer pusher is too large or the microphone sound feedback causes self-excited howling, it is also easy to damage the speaker. For outdoor small sound systems, a strong power reserve is required. Generally, the outdoor sound field is increased by 3dB sound pressure level, and the power needs to be increased by 10 times. According to the sound pressure level = 20log (P/P0), the specific value of the sound field can be calculated. When the continuous undistorted power of the power amplifier is 1.2 to 1.5 times the rated power of the speaker, the equipment can be safely and stably operated.
Early-stage sound preparation is different from other fixed-type audio systems. The preparation of open-air audio is especially important, including familiarity with the site, power supply, and cable laying. When conditions permit, you should familiarize yourself with the geographical location of the venue one day in advance and establish the sound system layout points. On the day of the event, make preparations in advance to ensure that nothing is lost.
The sound system energy comes from the grid circuit, the power circuit is faulty, the lighter makes the system unable to make a sound, and the heavy one will destroy the audio equipment. Therefore, the power supply circuit should be guaranteed to work properly. For remote areas, temporary generators are not permitted if conditions permit, and should be protected by specialized personnel. Before adjusting the work, use a multimeter to measure the voltage of all power outlets, and establish a good grounding of the equipment and the same phase of the power supply wiring. Poor grounding or phase errors often cause interference and noise noise intrusion, resulting in deterioration of acoustic performance.
All kinds of cable laying must be accurately placed according to the layout position. Care should be taken when laying the wire. Try to make the mark as obvious. As the basis for finding the installation and repair, do not mess with the cable. At the same time, each cable should leave enough margin, and the connection of each equipment connector and plug connector is correct. When releasing the line, carefully check each line for damage or poor quality, and replace it as soon as possible. For the laid cables, especially the speaker lines, special personnel must be protected to avoid malfunctions caused by frequent disconnection and short circuit of the speaker wires due to frequent activities of the venue personnel, and even damage the power amplifier. Outdoor sound adjustment and precautions Outdoors, sound pressure will decrease with increasing distance. In order to overcome this problem, it is necessary to raise the position of the speaker, and it is possible to hoist the speaker. Shorten the distance between the front and the back. At the same time, it can also overcome the fact that the sound waves of the low-level speakers are absorbed by the front-view audience, which makes the high-end audio loss large and affects the rear audience. For speaker types, outdoor dedicated speakers or mid-high horn speakers are recommended.
After confirming that the speaker position, power supply, and cable are connected correctly, you can turn on the sound source (CD, VCD, MD, VCR), the mixer, and the rear amplifier (in reverse order), and then adjust the mixer.
(1) Adjust the amplifier volume control potentiometer to the maximum position; the mixer accompaniment music and microphone splitter putter is set to 0dB; the GAIN input gain of each branch is in the adjusted position; the mixer total putter is at the minimum position ; the mixer sound quality compensation knob is in the middle position;
(2) Debug the accompaniment channel, select the familiar track, pay attention to the moderate volume, and repeatedly adjust the GAIN gain and EQ sound quality compensation until the sound effect is satisfactory.
(3) Debug the microphone channel (the split of the microphone channel in the mixer must be fixed from left to right according to the venue). For the condenser microphone, the mixer should provide +48V power. When the microphone volume is adjusted, the splitter is at 0dB, the GAIN input gain is adjusted, and the PEAK (peak level indicator) occasionally flashes.
Outdoors, on-site noise and acoustic feedback (howling) must be taken seriously. For the former, a high-sensitivity microphone can be selected. When the noise of the breathing noise and the wind is obvious, a windshield should be added, and the GAIN knob should be adjusted to ensure that the gain is not reduced. Practice has proved that the sponge windshield does not hurt the sound, the high frequency has slipped, but can be corrected by the mixer EQ. There are many reasons for causing acoustic feedback, even high-density equipment is inevitable. In practice, as long as some measures are taken, they can still be suppressed.
(1) Keep the microphone away from the speaker, and the microphone position is not as far as possible in the radiation area of ​​the speaker sound.
(2) According to the scene, reduce the volume of the microphone channel appropriately. If there is ringing, reduce the volume in time. When the host or other personnel have to pass the front of the speaker, pay attention to the volume control.
(3) Compensate the sound quality through the mixer. When debugging the demonstration performance, increase the volume until the system just generates self-excitation, and then adjust the equalizer adjustment knob from the low frequency one by one to effectively eliminate the frequency of self-excited howling. According to experience, for the frequency at which self-excited resonance occurs, it can be pulled down by 3 to 5 dB at this frequency point. It is very difficult to eliminate acoustic feedback fundamentally. In addition to adding feedback suppressors, pressure limiters, and frequency shifters, you should also be proficient in the performance and accumulated experience of various equipments. The characteristics of open-air audio selection and sound system design are very wide. According to the different places of the open-air audio and the difference in environment, it is advisable to use the temporary installation mobile type. Follow the principles of practicality and application, so that the purchased equipment is not idle, fully function and simple operation, etc., and the consistency of the performance of the equipment files should be maintained to avoid the phenomenon of “not matchingâ€. As an open-air audio, the selection also takes into account the stability and durability of the work in harsh environments.
As with other audio system designs, the open-air audio should master the configuration ratio when establishing the power configuration of the speakers and amplifiers. If the power "power" of the power amplifier is insufficient, it will not be able to cope with the sudden peak of the moment, resulting in a loud volume and a rough sound quality. If the instantaneous peak volume is 10dB of normal volume, a 100W amplifier is required to play back the average power of 10W. When the mixer pusher is too large or the microphone sound feedback causes self-excited howling, it is also easy to damage the speaker. For outdoor small sound systems, a strong power reserve is required. Generally, the outdoor sound field is increased by 3dB sound pressure level, and the power needs to be increased by 10 times. According to the sound pressure level = 20log (P/P0), the specific value of the sound field can be calculated. When the continuous undistorted power of the power amplifier is 1.2 to 1.5 times the rated power of the speaker, the equipment can be safely and stably operated.
Early-stage sound preparation is different from other fixed-type audio systems. The preparation of open-air audio is especially important, including familiarity with the site, power supply, and cable laying. When conditions permit, you should familiarize yourself with the geographical location of the venue one day in advance and establish the sound system layout points. On the day of the event, make preparations in advance to ensure that nothing is lost.
The sound system energy comes from the grid circuit, the power circuit is faulty, the lighter makes the system unable to make a sound, and the heavy one will destroy the audio equipment. Therefore, the power supply circuit should be guaranteed to work properly. For remote areas, temporary generators are not permitted if conditions permit, and should be protected by specialized personnel. Before adjusting the work, use a multimeter to measure the voltage of all power outlets, and establish a good grounding of the equipment and the same phase of the power supply wiring. Poor grounding or phase errors often cause interference and noise noise intrusion, resulting in deterioration of acoustic performance.
All kinds of cable laying must be accurately placed according to the layout position. Care should be taken when laying the wire. Try to make the mark as obvious. As the basis for finding the installation and repair, do not mess with the cable. At the same time, each cable should leave enough margin, and the connection of each equipment connector and plug connector is correct. When releasing the line, carefully check each line for damage or poor quality, and replace it as soon as possible. For the laid cables, especially the speaker lines, special personnel must be protected to avoid malfunctions caused by frequent disconnection and short circuit of the speaker wires due to frequent activities of the venue personnel, and even damage the power amplifier. Outdoor sound adjustment and precautions Outdoors, sound pressure will decrease with increasing distance. In order to overcome this problem, it is necessary to raise the position of the speaker, and it is possible to hoist the speaker. Shorten the distance between the front and the back. At the same time, it can also overcome the fact that the sound waves of the low-level speakers are absorbed by the front-view audience, which makes the high-end audio loss large and affects the rear audience. For speaker types, outdoor dedicated speakers or mid-high horn speakers are recommended.
After confirming that the speaker position, power supply, and cable are connected correctly, you can turn on the sound source (CD, VCD, MD, VCR), the mixer, and the rear amplifier (in reverse order), and then adjust the mixer.
(1) Adjust the amplifier volume control potentiometer to the maximum position; the mixer accompaniment music and microphone splitter putter is set to 0dB; the GAIN input gain of each branch is in the adjusted position; the mixer total putter is at the minimum position ; the mixer sound quality compensation knob is in the middle position;
(2) Debug the accompaniment channel, select the familiar track, pay attention to the moderate volume, and repeatedly adjust the GAIN gain and EQ sound quality compensation until the sound effect is satisfactory.
(3) Debug the microphone channel (the split of the microphone channel in the mixer must be fixed from left to right according to the venue). For the condenser microphone, the mixer should provide +48V power. When the microphone volume is adjusted, the splitter is at 0dB, the GAIN input gain is adjusted, and the PEAK (peak level indicator) occasionally flashes.
Outdoors, on-site noise and acoustic feedback (howling) must be taken seriously. For the former, a high-sensitivity microphone can be selected. When the noise of the breathing noise and the wind is obvious, a windshield should be added, and the GAIN knob should be adjusted to ensure that the gain is not reduced. Practice has proved that the sponge windshield does not hurt the sound, the high frequency has slipped, but can be corrected by the mixer EQ. There are many reasons for causing acoustic feedback, even high-density equipment is inevitable. In practice, as long as some measures are taken, they can still be suppressed.
(1) Keep the microphone away from the speaker, and the microphone position is not as far as possible in the radiation area of ​​the speaker sound.
(2) According to the scene, reduce the volume of the microphone channel appropriately. If there is ringing, reduce the volume in time. When the host or other personnel have to pass the front of the speaker, pay attention to the volume control.
(3) Compensate the sound quality through the mixer. When debugging the demonstration performance, increase the volume until the system just generates self-excitation, and then adjust the equalizer adjustment knob from the low frequency one by one to effectively eliminate the frequency of self-excited howling. According to experience, for the frequency at which self-excited resonance occurs, it can be pulled down by 3 to 5 dB at this frequency point. It is very difficult to eliminate acoustic feedback fundamentally. In addition to adding feedback suppressors, pressure limiters, and frequency shifters, you should also be proficient in the performance and accumulated experience of various equipments.
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