Baffle 36mm thick, do i need to chamfer?

iampivot · 07:03 AM

I've just finished routing my baffles (2x18mm) for my ZRT 2.5 way sealed.

Should I do a 45" chamfer around the the woofer, or can I just use the same 1/2" rounding bit as i'll use on my baffle edges?

planet10 · 8th April 2012, 08:34 PM

I would suggest a big champher is necessary if you want to avoid cavity resonance from screwing up your mids.

dave

tvrgeek · 8th April 2012, 08:51 PM

Round vs. camber. Two issues, you pick. Camber will have a sharp edge that is libel to produce refraction. Round over a bit more restrictive so if you expect really large cone excursions, maybe an issue.

I camber, then hit it with a flapper disk and smooth everything out trying for a horn-like profile.

leadbelly · 8th April 2012, 08:53 PM

It's CHAMFER not camber, champher, or camfer!

planet10 · 8th April 2012, 09:09 PM

Quote:

Originally Posted by leadbelly

It's CHAMFER not camber, champher, or camfer!

Champher & camber are both correct, chamfer would be an americanization of champher.

dave

David Gatti · 8th April 2012, 10:18 PM

Once you chamfer the chamber you can clamber for some champagne, champ.

planet10 · 9th April 2012, 01:22 AM

awpagan · 9th April 2012, 06:22 AM

With the baffles, is there any minuses using 2x18mm mdf, instead of one piece 36mm?

I know it's hard to find large thickness mdf, the thickest I can find locally is 32mm.
But the suppliers can glue two thickness's together for me.

ps I did chamfer a 45 deg camber for woofer in a 25mm baffle

planet10 · 9th April 2012, 07:21 AM

2 layers of 18mm MDF are likely better than 1 x 36. 3x 12 would be better yet. 2 x 12mm of quality plywood even better.

dave

CCU · 9th April 2012, 07:53 AM

YES!

Troels gravesen did a big write up on the matter. I can't find it right now though

8th April 2012, 08:34 PM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 5	I would suggest a big champher is necessary if you want to avoid cavity resonance from screwing up your mids. dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

8th April 2012, 08:53 PM	#4
leadbelly diyAudio Member Join Date: Dec 2002 Location: Calgary, Alberta	It's CHAMFER not camber, champher, or camfer! __________________ Aerodynamics are for people who can't build engines. Enzo Ferrari

9th April 2012, 06:22 AM	#8
awpagan diyAudio Member Join Date: Nov 2004 Location: sydney	With the baffles, is there any minuses using 2x18mm mdf, instead of one piece 36mm? I know it's hard to find large thickness mdf, the thickest I can find locally is 32mm. But the suppliers can glue two thickness's together for me. ps I did chamfer a 45 deg camber for woofer in a 25mm baffle __________________ Indecision makes the world gone round. Maybe

9th April 2012, 07:21 AM	#9
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 5	2 layers of 18mm MDF are likely better than 1 x 36. 3x 12 would be better yet. 2 x 12mm of quality plywood even better. dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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8th April 2012, 08:51 PM	#3
tvrgeek diyAudio Member Join Date: Dec 2009 Location: Md	Round vs. camber. Two issues, you pick. Camber will have a sharp edge that is libel to produce refraction. Round over a bit more restrictive so if you expect really large cone excursions, maybe an issue. I camber, then hit it with a flapper disk and smooth everything out trying for a horn-like profile.

8th April 2012, 10:18 PM	#6
David Gatti diyAudio Member Join Date: Mar 2004 Location: Melbourne, Australia	Once you chamfer the chamber you can clamber for some champagne, champ.

9th April 2012, 01:22 AM	#7
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 5

9th April 2012, 07:53 AM	#10
CCU diyAudio Member Join Date: Apr 2007 Location: Kgs. Lyngby	YES! Troels gravesen did a big write up on the matter. I can't find it right now though

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