Effect of mounting driver on the inside of a baffle? - diyAudio
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Old 30th October 2009, 02:44 AM   #1
Theli is offline Theli  Canada
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Default Effect of mounting driver on the inside of a baffle?

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.
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Old 30th October 2009, 03:01 AM   #2
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Depends on the passband for that driver.
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Old 30th October 2009, 03:26 AM   #3
Theli is offline Theli  Canada
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hmm, more if higher frequency, less for lower frequency? And probably how much it is recessed, yes?
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Old 30th October 2009, 03:36 AM   #4
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Whenever we do that we do a 45 degree champher

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Old 30th October 2009, 04:01 PM   #5
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Right-oh! No problem for a woofer, but not great for a tweeter.
Dave runs fullrange, so both of the above apply. =)
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Old 30th October 2009, 04:15 PM   #6
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I wonder if there is a noticeable difference between a chamfer and a radius?
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Old 30th October 2009, 05:02 PM   #7
badman is offline badman  United States
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Quote:
Originally Posted by Cal Weldon View Post
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.
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Old 30th October 2009, 05:15 PM   #8
rdf is offline rdf  Canada
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Maybe a search on the classic LS3/5a will turn up something. Rear mounting is an integral part of its design.
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Old 30th October 2009, 06:04 PM   #9
tinitus is offline tinitus  Europe
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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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Old 30th October 2009, 11:48 PM   #10
gedlee is offline gedlee  United States
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Originally Posted by Theli View Post
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.
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