Church sound system solutions and Microphone sensitivity

[Mentholatum101]

Would different microphones have different size for the "bubble" when adjusted to the identical gain?

What about turning the mixer low but the amplifier high?

Thanks for the illustration!

[TheBlackxism]

surely gave me a better idea and a very clear concept!! may GOD bless you!

[MrOllie86]

When a particular frequency comes out of the speakers and back in the mic again, louder than it was initially sounded, you have yourself a feedback loop, at a particular frequency or in a band of freequencies, sometime the frequencies 'take off' simultaneously i.e. 1.6kHz and 3.15kHz may feedback at a similar level of gain but you would hear two distinct tones at different pitch.

[MrOllie86]

Also worth a note, this bubble differs depending on frequency, i.e. mid and hf is more directional. the lower the frequency, the more omnidirectional it is. Also microphones have a polar plot which is also frequency specific i.e. it will pick up 70Hz from the rear, but possibly not so much 7kHz.

Feedback occurs at a particular frequency but may be at many frequencies at the same time, you will be hearing sine waves, at different frequencies.

[imagepictures]

@MrOllie86 Thank you for your comments and detailed explanation. Please realize I train volunteers at churches who want a basic understanding of sound.

[amplivoxsound]

Even as a member of the professional sound community, the illustration in this video helped me get feedback and sensitivity more.

A while back I included this video in a blog. Keep up the good work!

[imagepictures]

@amplivoxsound Thank you for your comment and including it in your blog, Thank You.

[MrBassdog]

Very nice illustration !

[imagepictures]

@MrBassdog Thank You for your comment

[imagepictures]

Thank You for the comment

[tboris]

...finally a great visual to understand feedback problems.