Looking for Speaker Builder '99 article - Navigating Speaker Design

percy · 10th June 2011, 12:40 AM

especially Part 3 where it talks about enclosure bracing. Anyone have a pdf or anything or can make a copy and mail it to me ?
Thanks.

AllenB · 02:04 AM

I have the magazine in front of me, but no scanner. If no-one else can help, ask and I could read it later tonight or tomorrow and give you the gist of it.

EDIT: I didn't read this but it looks like something by Mark Wheeler, the author of the Speaker Builder article. It is not the article but it does use the same illustration.Cabinet walls and Loudspeaker Energy Preservation - [English]

Ron E · 10th June 2011, 02:43 AM

Quote:

Originally Posted by percy

especially Part 3 where it talks about enclosure bracing. Anyone have a pdf or anything or can make a copy and mail it to me ?
Thanks.

Lengthwise bracing on panels is very effective, as are plywood ribs ~3x thickness, dadoed and glued into the panels.

percy · 10th June 2011, 02:59 AM

yes, what I am looking for is the part where they conclude that vertical bracing is better than horizontal, and two part epoxy is better than wood glue.

AllenB · 10th June 2011, 03:35 AM

OK, um... tests were listening tests with a bunch of people, differences were mainly clarity and the ability to differentiate different parts of the music. Mostly the material used for the brace was more important than the design of the brace or the way it was fixed. Hardwood was best, density was important. Vertical was much better than horizontal or circumferential (shelf). Mid-panel side to side or front to back was not good enough to be noticeable. Glue was almost as important as material. Hard setting adhesives were recommended, not wood glue or hot melt.

This article seems more like a discussion rather than a proof. Not that I disbelieve it, just that there isn't much data when you dig deep.

percy · 10th June 2011, 11:20 AM

interesting, so there arn't any objective test and results ?

Ron E · 10th June 2011, 11:27 AM

Quote:

Originally Posted by percy

yes, what I am looking for is the part where they conclude that vertical bracing is better than horizontal, and two part epoxy is better than wood glue.

I have tried vertical and horizontal, and vertical is way better. I have a friend who tried vertical ribs and that cabinet is quite stiff.

Two part epoxy - I doubt it's any better than wood glue. A good joint with wood glue is stronger than the wood. The reason they use epoxy in boat building is that it is waterproof.

Take a look at woodgears.ca - Matthias Wandel has a bunch of wood glue tests.

Regards,
Ron

AllenB · 10th June 2011, 11:37 AM

No, apart from a response plot showing thicker panels forced the fundamental resonance higher, and the harmonics reduced in level. He did mention also that softwood is virtually ineffective and that he liked some powdered formaldehyde based adhesive.

percy · 10th June 2011, 01:20 PM

Glue - looks like its more about the stiffness/hardness rather than the strength (just like when comparing hardwood v/s softwood).

10th June 2011, 12:40 AM	#1
percy diyAudio Member Join Date: Apr 2004 Location: MN	Looking for Speaker Builder '99 article - Navigating Speaker Design especially Part 3 where it talks about enclosure bracing. Anyone have a pdf or anything or can make a copy and mail it to me ? Thanks.

10th June 2011, 02:00 AM	#2
AllenB diyAudio Member Join Date: Oct 2008	I have the magazine in front of me, but no scanner. If no-one else can help, ask and I could read it later tonight or tomorrow and give you the gist of it. EDIT: I didn't read this but it looks like something by Mark Wheeler, the author of the Speaker Builder article. It is not the article but it does use the same illustration.Cabinet walls and Loudspeaker Energy Preservation - [English] Last edited by AllenB; 10th June 2011 at 02:04 AM.

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10th June 2011, 02:59 AM	#4
percy diyAudio Member Join Date: Apr 2004 Location: MN	yes, what I am looking for is the part where they conclude that vertical bracing is better than horizontal, and two part epoxy is better than wood glue.

10th June 2011, 03:35 AM	#5
AllenB diyAudio Member Join Date: Oct 2008	OK, um... tests were listening tests with a bunch of people, differences were mainly clarity and the ability to differentiate different parts of the music. Mostly the material used for the brace was more important than the design of the brace or the way it was fixed. Hardwood was best, density was important. Vertical was much better than horizontal or circumferential (shelf). Mid-panel side to side or front to back was not good enough to be noticeable. Glue was almost as important as material. Hard setting adhesives were recommended, not wood glue or hot melt. This article seems more like a discussion rather than a proof. Not that I disbelieve it, just that there isn't much data when you dig deep.

10th June 2011, 11:20 AM	#6
percy diyAudio Member Join Date: Apr 2004 Location: MN	interesting, so there arn't any objective test and results ?

10th June 2011, 11:37 AM	#8
AllenB diyAudio Member Join Date: Oct 2008	No, apart from a response plot showing thicker panels forced the fundamental resonance higher, and the harmonics reduced in level. He did mention also that softwood is virtually ineffective and that he liked some powdered formaldehyde based adhesive.

10th June 2011, 01:20 PM	#9
percy diyAudio Member Join Date: Apr 2004 Location: MN	Glue - looks like its more about the stiffness/hardness rather than the strength (just like when comparing hardwood v/s softwood).

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