Feedback / Microphone: Difference between revisions

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Here are some notes about feedback. Rather than sending you following links, I've just put things that seemed relevant below.

~~From the Bose Support Site~~

== My vocal microphone keeps encountering feedback. Is there anything I can do to stop it? ==

From the Official Product Troubleshooting Page <ref>[http://www.bose.com/controller?event=VIEW_STATIC_PAGE_EVENT&url=/musicians/support/troubleshooting.jsp&ck=0#feedback Official Product Troubleshooting Pages]</ref>.

~~'''~~My vocal microphone keeps encountering feedback. Is there anything I can do to stop it?~~'''~~

* Orient the microphone so that it is not pointing directly at your Cylindrical Radiator™ loudspeaker. It’s best when your system is not directly behind you- give greater than 5 feet distance between you and your system.

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== How do I control feedback that I may get when using microphones? ==

From the Official Product FAQs <ref>[http://www.bose.com/controller?event=VIEW_STATIC_PAGE_EVENT&url=/musicians/support/product_faqs.jsp&ck=0#question40 Official Product FAQs]</ref>.

Techniques that control feedback with a conventional system help with the Personalized Amplification System™ approach also.

* Get close to the microphone. No other technique has a big an impact on feedback. Each halving of distance is approximately another 6 dB of gain before feedback. This means that the difference between working a mic at 2 inches, and 1/4 inch is18dB!

* Use a directional microphone. Hypercardioid is better than cardioid, which is way better than omnidirectional. All sound waves impinging on the microphone from a direction other than the intended signal is "noise" and will lower the threshold of feedback.

* Use as few open microphones as possible. When a microphone is not in use, turn it off.

* When stand mounting a directional microphone, tilt the microphone up ten or twenty degrees off the horizon so that it is less sensitive to direct sound from the speakers.

* Use the HIGH tone control knob for the microphone channel carefully. Feedback could occur when this is set too high.

== Microphone on a Stand ==

Here's a sketch of setting up a microphone on stand.

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+<!-- TODO resolve and reconcile these so we have one note from the official pages and no conflicting advice -->
 Here are some notes about feedback. Rather than sending you following links, I've just put things that seemed relevant below.
-From the Bose Support Site
+== My vocal microphone keeps encountering feedback. Is there anything I can do to stop it? ==
+From  the Official Product Troubleshooting Page <ref>[http://www.bose.com/controller?event=VIEW_STATIC_PAGE_EVENT&url=/musicians/support/troubleshooting.jsp&ck=0#feedback  Official Product Troubleshooting Pages]</ref>.
-'''My vocal microphone keeps encountering feedback. Is there anything I can do to stop it?'''
 * Orient the microphone so that it is not pointing directly at your Cylindrical Radiator™ loudspeaker. It’s best when your system is not directly behind you- give greater than 5 feet distance between you and your system.
@@ Line 14: / Line 14: @@
+== How do I control feedback that I may get when using microphones? ==
+From  the Official Product FAQs <ref>[http://www.bose.com/controller?event=VIEW_STATIC_PAGE_EVENT&url=/musicians/support/product_faqs.jsp&ck=0#question40 Official Product FAQs]</ref>.
+Techniques that control feedback with a conventional system help with the Personalized Amplification System™ approach also.
+* Get close to the microphone. No other technique has a big an impact on feedback. Each halving of distance is approximately another 6 dB of gain before feedback. This means that the difference between working a mic at 2 inches, and 1/4 inch is18dB!
+* Use a directional microphone. Hypercardioid is better than cardioid, which is way better than omnidirectional. All sound waves impinging on the microphone from a direction other than the intended signal is "noise" and will lower the threshold of feedback.
+* Use as few open microphones as possible. When a microphone is not in use, turn it off.
+* When stand mounting a directional microphone, tilt the microphone up ten or twenty degrees off the horizon so that it is less sensitive to direct sound from the speakers.
+* Use the HIGH tone control knob for the microphone channel carefully. Feedback could occur when this is set too high.
+== Microphone on a Stand ==
 Here's a sketch of setting up a microphone on stand.