Effect of mounting driver on the inside of a baffle?

Theli · 30th October 2009, 02:44 AM

I'm wondering how the sound will be affected by mounting driver on the inside of a baffle with a radiused corner? I imagine it will get a slight waveguide effect but how much? Would there be enough change to have to redesign a existing crossover? Just speculating here.

454Casull · 30th October 2009, 03:01 AM

Depends on the passband for that driver.

Theli · 30th October 2009, 03:26 AM

hmm, more if higher frequency, less for lower frequency? And probably how much it is recessed, yes?

planet10 · 30th October 2009, 03:36 AM

Whenever we do that we do a 45 degree champher

dave

Pano · 30th October 2009, 04:01 PM

Right-oh! No problem for a woofer, but not great for a tweeter.
Dave runs fullrange, so both of the above apply. =)

Cal Weldon · 30th October 2009, 04:15 PM

I wonder if there is a noticeable difference between a chamfer and a radius?

badman · 30th October 2009, 05:02 PM

Quote:

Originally Posted by Cal Weldon

I wonder if there is a noticeable difference between a chamfer and a radius?

Dunno but the chamfer removes more obstacle. I did a chamfer on my last take on rear-mounting, and it did need some additional smoothing of the edges to not interfere with imaging (at least, not as much as it was before I softened the edges of the chamfer by sanding).

This was with a highly directional driver (8" JBL LE8T) for the frequencies of concern, so it's pretty important for anything playing high.

rdf · 30th October 2009, 05:15 PM

Maybe a search on the classic LS3/5a will turn up something. Rear mounting is an integral part of its design.

tinitus · 30th October 2009, 06:04 PM

On a small midrange backmounted ought to have good effect on giving it more space to breathe
And it makes phase allignment with woofer better, if that one is frontmounted
A tweeter should benefit as well
Much smoother surface, no screw edges and such

In the 3way I am building now, I will mount mid and tweet on the back of their own small removeable baffle
I might use 12mm plywood, but I guess 6-8mm alu plate would be fine too
Maybe I will consider double 12mm around tweeter, and make it into a small waveguide

gedlee · 30th October 2009, 11:48 PM

Quote:

Originally Posted by Theli

I'm wondering how the sound will be affected by mounting driver on the inside of a baffle with a radiused corner? I imagine it will get a slight waveguide effect but how much? Would there be enough change to have to redesign a existing crossover? Just speculating here.

I am going to redo my designs using the exact same approach - with a radius. There won't be much of a waveguide effect and with the radius there won't be much diffraction difference either. BUT, the driver is moving back - 3/4" in my case - and there will be a phase change in the far field, so I am anticipating a small crossover change to the woofer to compensate for this.

There will be a slight added acoustic mass at resonance, but for a closed box this is pretty benign. Ported, maybe not so.

30th October 2009, 03:01 AM	#2
454Casull diyAudio Member Join Date: Jan 2004 Location: Toronto, ON, Canada	Depends on the passband for that driver. __________________ Building a 2.1 system out of a 3/4"x4'x8' sheet

30th October 2009, 03:36 AM	#4
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	Whenever we do that we do a 45 degree champher dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

30th October 2009, 04:15 PM	#6
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	I wonder if there is a noticeable difference between a chamfer and a radius? __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

30th October 2009, 05:15 PM	#8
rdf diyAudio Member Join Date: Jun 2004 Location: big smoke	Maybe a search on the classic LS3/5a will turn up something. Rear mounting is an integral part of its design. __________________ Ears aren't microphones.

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30th October 2009, 03:26 AM	#3
Theli diyAudio Member Join Date: Jan 2004 Location: Saskatoon	hmm, more if higher frequency, less for lower frequency? And probably how much it is recessed, yes?

30th October 2009, 04:01 PM	#5
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	Right-oh! No problem for a woofer, but not great for a tweeter. Dave runs fullrange, so both of the above apply. =)

30th October 2009, 06:04 PM	#9
tinitus diyAudio Moderator Join Date: Nov 2005	On a small midrange backmounted ought to have good effect on giving it more space to breathe And it makes phase allignment with woofer better, if that one is frontmounted A tweeter should benefit as well Much smoother surface, no screw edges and such In the 3way I am building now, I will mount mid and tweet on the back of their own small removeable baffle I might use 12mm plywood, but I guess 6-8mm alu plate would be fine too Maybe I will consider double 12mm around tweeter, and make it into a small waveguide

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