Bose Portable PA Knowledge - User contributions [en]

Wiki Team

2007-03-27T03:46:53Z

1174966282:

<big>'''L1™ Wiki Project Team'''</big>

2006 08 23 Wednesday

Most of what you need to know about navigating the wiki is on the main page [[The Bose® L1™ Wiki]]. For some background on the project see [[The Bose L1™ Wiki Project]].

The plan is to incorporate this into our online community by linking into the wiki (this site) when people need reference material, and to continue to build up the knowledge as we go along.

To get back to this page, in the menu (at the left) click '''Wiki Team'''.

== How you can help ==
#[[Special:Userlogin|Create your account]] (when you get there click '''Create an account ''') (30 seconds max)
# After you create your account go to the top menu and click '''preferences''' [[Media:WikiInstructions.gif|Preview of what you will see]]

=== Take a look around ===
There are a couple of easy ways to find things.

The sort of expected navigation approach using the navigation links on the left side of the page
* go to the Users Guide OR
* type a key word into the Search box (also on the left side) OR
* click the link for a random page (You can do that as many times as you want for a fast flash around the wiki)

* You can find all the articles where you are mentioned by doing a search by your firstname or your forum ID.
* If you want to experiment with the editing process try the [[Sandbox]]

==== Any comments you have would be great ====
Add a comment by clicking the '''discussion tab''' at the top of any page. Then click the '''+''' tab that will appear to add a new comment.

Please sign your comments with four tilde symbols <nowiki>~~~~</nowiki> and the system will insert your name, date and time.

Let's use the discussion feature to do the same thing for the overall project - right here on this page.

=== Edits ===
* Fix anything you see that looks like it needs fixing.
* Hit the '''edit''' tab on any page that looks like it needs help, and give it a shot.

* Please use '''Summary''' and '''Show Preview''' before '''Save Page'''
It looks like this: [[Media:WikiSummary.gif|Please use Summary and Show Preview before Save Page]]

* '''Suggestion''' Save your work on your machine before you hit '''Save Page'''. We are on the web and sometimes there are temporary connection problems. I usually have a copy of Notepad running when I'm creating posts on the forum for this very reason. OK - so before you hit '''Save Page''' click in the editing window, use Ctrl-a (select all), Ctrl-c (copy to clipboard), paste it into Notepad. Then if anything bad happens, you still have your copy.

* If you want to experiment with the editing codes try the [[Sandbox]]

* PLEASE keep image uploads small. If you can link to them it would be much better as my server connection is not very fast. It is fine for text and images under 50k but it gets sluggish beyond that. If you have a large image you want to display here, for now - please drop me a note in the discussion page and I'll contact you.
- thanks [[User:ST|ST]] 04:38, 24 August 2006 (GMT-7)

=== New Articles ===

To add a new article, look at this list of [[Special:Allpages|all articles]] and you'll get an idea of the naming convention. Not hard wired, but I think you'll get the feel for it.

There are several ways to create a new article:
* Create a link in an existing page to your (as yet uncreated page) <nowiki>[[My New Article]]</nowiki>. This will appear in red like this:
[[Image:MyNewArticle.gif|''a link to a nonexistent page called My New Article''|center]]
Red links are for pages that do not yet exist. Follow a red link to create the article. This is a good way to make sure that there is at least one article that links to yours.

* Type the name of your new article in the "search" box in the left margin, then click "Go". If there is not already an article with that name there will be a link in red, near the top of the page called "create this page".
[[Image:CreateThisPage.gif|''red link creates a new page''|center]]

Click the red link and a new editing window will appear. That's it, you are creating your new article.

* You can use the form below (replace "My New Article" with the name of your article)

{|align="center" style="border:1px solid black" width="100px"
|
<inputbox>
default=My New Article
type=create
width=45
</inputbox>
|}

=== Templates for L1™ components ===
When referring to components of the L1™ System please use these templates <nowiki>{{{ some code }}} </nowiki>. The templates will be automatically expanded in the text with a link to a page defining the term.

<nowiki>{{A1}}</nowiki> displays as {{A1}}

<nowiki>{{A1 EB}}</nowiki> becomes {{A1 EB}}

<nowiki>{{B1}}</nowiki> displays as {{B1}}

<nowiki>{{L1}}</nowiki> displays as {{L1}}

<nowiki>{{L1 CR}}</nowiki> displays as {{L1 CR}}

<nowiki>{{PAS}}</nowiki> displays as {{PAS}}

<nowiki>{{PS1}}</nowiki> displays as {{PS1}}

=== Templates for other things ===

<nowiki>{{Bose}}</nowiki> becomes {{Bose}}

<nowiki>{{forum}}</nowiki> becomes {{forum}}

=== Categories ===

Categories are optional, but extremely powerful and easy to use. They allow us to tie related pages together.

As you create or edit a page, you can add any number of [[Special:Categories|categories]]. For example if you are creating a page about a microphone technique you would add this.

<nowiki>[[category:Microphone]]</nowiki>

=== Uploading Files ===
Hint: I find it easier to write the article first and add the images after.

# Put the '''<nowiki>[[Image:MyImageName.jpg]]</nowiki> ''' tag in the article first.
# Save the article
# There will be a link to the 'nonexistent' image.
# Click the link and the wiki will take you to the image upload page with the 'Destination filename' already filled in with the name you specified in the tag. (Where it says "Please put a name here e.g. Plane-wave.jpg in the image below).
# Browse to the file on your local hard drive
# Add some notes about the image (so we can find it with Search later
# Upload the file.

[[Image:UploadingImages.gif]]

== It's Live ==

Please remember that the site is basically live and public now so for any really goofy stuff, try to do that in the Sandbox page and I'll clean it up later.

== Create Your Account ==
(30 seconds max)

Look for '''Create account / login''' at the top right of the screen.

After you create your account go to the top menu and click '''preferences'''

[[Image:WikiInstructions.gif|frame|left]]

[[category:Wiki Team]]
[[category:The Bose L1™ Wiki Project]]

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Feedback / Microphone

2007-03-27T03:46:25Z

1174966282:

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

== 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>.

* 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.
* Try using a “close-miking” technique to increase the gain at the microphone and to reduce unwanted stage sound.
* Use the HIGH tone control knob for the microphone channel carefully. Feedback could occur when this is set too high.
* Upgrade your power stand to newer software that offer a high gain preset. see: Software Upgrading (This covers firmware update and Version 2.0 [[Presets]])
* If using a vocal effects processor, make sure that it is not contributing to the feedback problem.
* If 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.
* Try a different microphone such as a directional mic. Hypercardioid microphones work well with the system.

== 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.

[[Image:MicGoodBad.gif]]

=== Other general notes ===

* All players should be playing / singing through the Bose System closest to them
* Every doubling of distance between the microphone and the singer reduces gain-before-feedback by a factor of 4. The difference between 1/2 inch and an inch can be significant.
* Wherever possible "acoustic" instruments should use pickups instead of microphones. This is important because many players find it a struggle to keep a consistant and close distance between the microphone and their instrument. Also, an instrument can be a source of feedback as it resonates with the amplified sound.
* Another (low prority) design guide-line could be to keep open mics as far apart as possible. Neighboring systems with open mics can mututally decrease gain-before-feedback

==== Handling the Microphone ====
shure.com notes <ref>[http://www.shure.com/shurenotes/how_june2004/default.asp Miking Live Vocals - from shure.com]</ref>

Seems like a pretty natural thing, doesn't it? But how your vocalists handle the mic has a major effect on the resulting sound. It may look great, but your tech team won't get the sound they want when your soloist holds a microphone an arm's length from her mouth.

=== Why? ===

The first reason is the inverse square law. If you hold your mic a half-inch from your lips it receives a given amount of sound energy from your voice. Move it twice as far-one inch-and it receives one-fourth as much energy. That extra half -inch takes away three-quarters of the efficiency of your sound system. While good mic technique involves "working" the microphone, singers that fully extend their arms when reaching for that climax, are usually doing it for dramatic effect. Small changes in distance from the mouth can result in very dramatic changes in sound level.

Second: When you move the mic away from your lips, you must turn up the microphone level at the mixer to be heard, and more unwanted sound enters the mic. When sound from a monitor speaker enters the mic, it instantly becomes the earsplitting screech we know as feedback. Keeping the mic close to your mouth minimizes feedback.

See the whole article: [http://www.shure.com/shurenotes/how_june2004/default.asp Miking Live Vocals]

== Other References ==
* [http://www.shure.com/stellent/groups/public/@gms_gmi_web_ug/documents/web_resource/us_pro_mics_for_music_sound_ea.pdf Microphone Techniques for Live Sound Reinforcement] Shure Educational Publication 2006 39 pages - pdf format
- [http://bose.infopop.cc/eve/forums/a/ga/ul/5711082304/us_pro_mics_for_music_sound_ea.pdf alternate source for above]

[[User:ST|ST]] 15:46, 22 August 2006 (GMT-7)
----
<references/>

[[category:Feedback]]
[[category:Performance]]
[[category:Reference]]

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Instruments / Drums

2007-03-27T03:46:02Z

1174966282:

[[Image:GretchDrums.gif]][[Image:Percussion.gif]][[Image:TrapKat.gif]][[Image:VDrums.gif]]

== Out-of-Phase Overheads ==

Originally posted by Cliff-at-Bose: in Out of Phase Overheads <ref>[http://bose.infopop.cc/eve/forums/a/tpc/f/8566055944/m/4341033052/r/3781073052#3781073052 Cliff-at-Bose: in Out of Phase Overheads Original post in the Bose® Musicians Community Message Boards]</ref>
[[Image:Male2Female_XYThumb.gif|Two Female to Male XLR|right]]
These are not "overheads" but 57's placed below the cymbals and above the top heads of a small kit. The mics are wired out of phase, basically 2 and 3 reversed on an XLR. There's lots written about this on our forum. But the basic idea is that the pair will cancel onstage bass but pick up local instruments on the kit, in an effort to reduce rebroadcasting onstage bass from the drum mics. This way we get a stronger signal than typical overheads and cleaner bass onstage. To "mix" these, just move the mics closer to the instrument you want to emphasize. Typical setup is on either side of the snare facing the snare. Snare is everywhere and there is no need to put a mic directly on it. It's actually pretty easy to set up and adjust, moving the mics around for a good kit mix. With 3 mics and only 2 inputs on the PS1, we get a really nice amplified sound for our shows. I listened to the output of the pair recently (multitrack recordings of a recent show) and the cancelling thing really works great. Give it a try.

Hilmar-at-Bose talks about Wiring Two SM57s with a Y cord <ref>[http://bose.infopop.cc/eve/forums/a/tpc/f/3976055944/m/1441055631/r/1441055631 Hilmar-at-Bose talks about Wiring Two SM75s with a Y cord Original post in the Bose® Musicians Community Message Boards]</ref>

Here's the nerds view.

Wiring the the two mics out of phase creates essentially a "dipole". Everything that is in the middle (i.e. equal distance) between the two microphones will get equally but out-of-phase so it cancels when the two microphone signals are summed together. In essence it creates a "blind spot" for the microphones for whatever is right in the middle plane. For the drums, that's mainly the kick (as Larry pointed out) and also the drummer (when he/she is hemming and hawing, squeaking with the chair, yelling about or in general having a grand old time).

Another nice trick is to place the L1 that gets the mic signal somewhere the middle plane of the microphones. This drastically reduces potential for feedback and unwanted regeneration.
Sound sources that are significantly closer to any one of the microphones are not much affected by the whole procedure.

[http://bose.infopop.cc/eve/forums/a/tpc/f/3976055944/m/1441055631?r=1441055631#1441055631 the original discussion] ← is highly recommended.

[[category:Drums]]

[[category:Instruments]]

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