Diffraction/Rounded Baffle

Vikash · 11th July 2003, 02:03 PM

On the Curve Sided Loudspeaker page posted a short time ago, the transverse lamination examples have flat baffles...

I want to incorporate this lamination method into my design but was wandering why the enclosures shown have stopped short of going for a full rounded baffle - which would have helped further reduce diffraction effects. Or is this incorrect?

7V · 11th July 2003, 02:42 PM

Quote:

Originally posted by Vikash
I want to incorporate this lamination method into my design but was wandering why the enclosures shown have stopped short of going for a full rounded baffle - which would have helped further reduce diffraction effects. Or is this incorrect?

Personally, I went as far as I could with the rounding. Just couldn't get round the fact that you need a flat surface to mount the drive-units to.

Other than that, you have to juggle height, depth, width and wall thickness to end up with the right volume.

Good luck with your Translams, Vikash. Post us any drawings or photos when you have them.

Steve

Vikash · 12th July 2003, 01:56 AM

Hello Steve,

Quote:

...need a flat surface to mount the drive-units

Just thought i'd bounce an idea of you...

The driver would only be flush on part of the baffle. Don't know if i'm gaining something or losing something. Certainly looks cool

7V · 12th July 2003, 02:22 AM

And is that an egg shape inside?

I love it.

Vikash · 12th July 2003, 02:31 AM

Still awake and on the forum like a true fanatic i see

It's egg all the way! Outside for diffraction, inside for standing waves.

7V · 12th July 2003, 02:45 AM

Stunning. What's the driver?

Vikash · 12th July 2003, 02:53 AM

I've decided on the Seas W22EX002. Tweeter yet to be decided. Choices are reduced due to the low cut off required for the mid range. And it doesn't help that I have no crossover designing experience. Well, one thing at a time.

It's as much about the journey as the ending right...

Variac · 12th July 2003, 04:44 AM

The downside of course are the sharp edges in front of the driver.

I guess I would have a short cylinder extending out to the frontmost edge of the curved baffle so the top and bottom of the cylinder would extend the same as the baffle but the sides would be a couple of inches long. Then mount the driver in the end of the cylinder. Inside and outside eggs seem the way to go....

EC8010 · 12th July 2003, 05:16 AM

Heavily chamfer the front edges to the driver? Do that, and you won't have egg all over your face.

Nappylady · 12th July 2003, 07:06 AM

correct me if I'm wrong, but the sharp edges in front of the driver won't be *much* of a problem if the driver is crossed over fairly low...

though, if you're going for full-range, maybe that's not an option.

*shrug*

11th July 2003, 02:03 PM	#1
Vikash diyAudio Moderator Emeritus Join Date: May 2003 Location: UK	Diffraction/Rounded Baffle On the Curve Sided Loudspeaker page posted a short time ago, the transverse lamination examples have flat baffles... I want to incorporate this lamination method into my design but was wandering why the enclosures shown have stopped short of going for a full rounded baffle - which would have helped further reduce diffraction effects. Or is this incorrect?

12th July 2003, 04:44 AM	#8
Variac diyAudio Editor Join Date: Dec 2001 Location: San Francisco, USA	The downside of course are the sharp edges in front of the driver. I guess I would have a short cylinder extending out to the frontmost edge of the curved baffle so the top and bottom of the cylinder would extend the same as the baffle but the sides would be a couple of inches long. Then mount the driver in the end of the cylinder. Inside and outside eggs seem the way to go.... __________________ Burning Amp Festival Sunday, October 28th, 2012 in S.F. We need Volunteers & sign-up's for what you're bringing!

12th July 2003, 05:16 AM	#9
EC8010 diyAudio Moderator Join Date: Jan 2003 Location: Near London. UK	Heavily chamfer the front edges to the driver? Do that, and you won't have egg all over your face. __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

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12th July 2003, 02:22 AM	#4
7V diyAudio Member Join Date: Feb 2003 Location: North London	And is that an egg shape inside? I love it.

12th July 2003, 02:31 AM	#5
Vikash diyAudio Moderator Emeritus Join Date: May 2003 Location: UK	Still awake and on the forum like a true fanatic i see It's egg all the way! Outside for diffraction, inside for standing waves.

12th July 2003, 02:45 AM	#6
7V diyAudio Member Join Date: Feb 2003 Location: North London	Stunning. What's the driver?

12th July 2003, 02:53 AM	#7
Vikash diyAudio Moderator Emeritus Join Date: May 2003 Location: UK	I've decided on the Seas W22EX002. Tweeter yet to be decided. Choices are reduced due to the low cut off required for the mid range. And it doesn't help that I have no crossover designing experience. Well, one thing at a time. It's as much about the journey as the ending right...

12th July 2003, 07:06 AM	#10
Nappylady diyAudio Member Join Date: Feb 2003 Location: Salt Lake City	correct me if I'm wrong, but the sharp edges in front of the driver won't be much of a problem if the driver is crossed over fairly low... though, if you're going for full-range, maybe that's not an option. shrug

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