Feedback / Microphone: Difference between revisions
Ken adding section on (non) relationship between microphone sensitivity and feedback; added Bose Reviewed |
Moving sensitivity item to end, adding figure |
||
| Line 8: | Line 8: | ||
== Gain Staging == | == What is feedback and how does it occur? == | ||
Feedback occurs when the sound from the loudspeaker (or loudspeakers if a microphone is connected to more than one) is louder at the microphone than the sound of the voice. | |||
This fundamental fact is shown in the figure below. | |||
[[Image:Feedback fig 1.jpg]] | |||
== Techniques For Reducing Feedback == | |||
=== Gain Staging === | |||
If you are having issues with feedback, check your gain staging. This is critical to getting sufficient [[Gain Before Feedback|gain before feedback]] in live performance applications. | If you are having issues with feedback, check your gain staging. This is critical to getting sufficient [[Gain Before Feedback|gain before feedback]] in live performance applications. | ||
| Line 17: | Line 25: | ||
* If you are using the {{T1}}, the principles are the same as shown on the video: simply substitute the [[T1_ToneMatch%C2%AE_Audio_Engine#Set_Input_Trim|trim]] on the {{T1r}} for the trim on the Classic or Model I. {{T1 icon}} | * If you are using the {{T1}}, the principles are the same as shown on the video: simply substitute the [[T1_ToneMatch%C2%AE_Audio_Engine#Set_Input_Trim|trim]] on the {{T1r}} for the trim on the Classic or Model I. {{T1 icon}} | ||
=== Close Microphone Technique === | === Close Microphone Technique === | ||
'''Get close to the microphone''' when you want to be loud. No other technique has a big an impact on feedback. Each halving of distance is approximately another 6 dB of [[Gain Before Feedback|gain before feedback]]. This relationship in physics is known as the [[Inverse Square Law]]. This means that the difference between working a microphone at 2 inches, and 1/4 inch is 18 dB, which is more than twice as loud. While good mic technique often involves "working" the microphone at different distances, singers must be mindful of the fact that small changes in distance from the mouth result in very dramatic changes in sound level. | '''Get close to the microphone''' when you want to be loud. No other technique has a big an impact on feedback. Each halving of distance is approximately another 6 dB of [[Gain Before Feedback|gain before feedback]]. This relationship in physics is known as the [[Inverse Square Law]]. This means that the difference between working a microphone at 2 inches, and 1/4 inch is 18 dB, which is more than twice as loud. While good mic technique often involves "working" the microphone at different distances, singers must be mindful of the fact that small changes in distance from the mouth result in very dramatic changes in sound level. | ||
| Line 45: | Line 49: | ||
=== Distance Between Microphones === | === Distance Between Microphones === | ||
Another (low priority) design guide-line could be to keep open microphones as far apart as possible. Neighboring systems with open microphones can mutually decrease [[Gain Before Feedback|gain before feedback]]. | Another (low priority) design guide-line could be to keep open microphones as far apart as possible. Neighboring systems with open microphones can mutually decrease [[Gain Before Feedback|gain before feedback]]. | ||
== Does Microphone Sensitivity Affect Feedback? == | |||
{{Microphone Sensitivity and Feedback}} | |||
== Techniques specific to the {{L1 family}} == | == Techniques specific to the {{L1 family}} == | ||