Ring & a Half Mode: Before and After Bracing

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Ring & a Half Mode: Before and After Bracing

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Darryl Young

Post subject: Ring & a Half Mode: Before and After Bracing

Posted: Thu Aug 27, 2009 9:25 pm

Contributing Member

Joined: Wed Oct 22, 2008 9:31 pm
Posts: 1877
First name: Darryl
Last Name: Young
State: AR
Country: USA
Focus: Build
Status: Amateur

I was curious how the bracing would change the ring & a half mode on my soundboard both in shape and in pitch. I have the braces glued on now so I did a quick test. The "after" photo is after bracing but before I've started voicing. The frequency of this mode raised exactly 100Hz after bracing.....wasn't trying for this and didn't realize this was the case till making this post.

The bracing is Red Spruce and the top is Carpathian. The bracing is traditional Martin X bracing glued with fish glue and the body is an OM. Be interesting to see how the pattern changes and lowers pitch as I shave the braces.

Before bracing, 163Hz:

Attachment:

163Hz1.JPG

After bracing, 263 Hz:

Attachment:

263 Hz After Bracing Before Voicing No Flash.JPG

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Formerly known as Adaboy.......

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truckjohn

Post subject: Re: Ring & a Half Mode: Before and After Bracing

Posted: Thu Aug 27, 2009 9:43 pm

Brazilian Rosewood

Joined: Thu Feb 12, 2009 10:27 pm
Posts: 2109
Location: South Carolina
First name: John
Last Name: Cox
Focus: Build
Status: Amateur

Daryl,

What sort of hardware/software are you using?

Thanks

John

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Darryl Young

Post subject: Re: Ring & a Half Mode: Before and After Bracing

Posted: Thu Aug 27, 2009 10:13 pm

Contributing Member

Joined: Wed Oct 22, 2008 9:31 pm
Posts: 1877
First name: Darryl
Last Name: Young
State: AR
Country: USA
Focus: Build
Status: Amateur

Just an old Dell computer speaker for an amplifier (a cheap one with volume control on the front). I'm using a 4" speaker from an old set of speakers I had in the garage. The frequency generator software I downloaded from the web called PAS (Programmable Analysis Software) for free.

Now that I'm looking at the pics, I sure wish I had rotated the picture 180 degrees before uploading.

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Burton LeGeyt

Post subject: Re: Ring & a Half Mode: Before and After Bracing

Posted: Thu Aug 27, 2009 11:21 pm

Koa

Joined: Sat Aug 19, 2006 1:29 am
Posts: 1384
Location: United States

Cool! I would love to see how it changes as you start shaping the braces. Thanks for posting the photos!

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Burton
http://www.legeytinstruments.com
Brookline, MA.

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Darryl Young

Post subject: Re: Ring & a Half Mode: Before and After Bracing

Posted: Fri Aug 28, 2009 1:27 pm

Contributing Member

Joined: Wed Oct 22, 2008 9:31 pm
Posts: 1877
First name: Darryl
Last Name: Young
State: AR
Country: USA
Focus: Build
Status: Amateur

As soon as I get the chainsaw blade shapened I'll have at it........

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