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Soft baffles - surely these will help?
Soft baffles - surely these will help?
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Old 6th July 2019, 08:41 AM   #1
zerokelvin99 is offline zerokelvin99  United Kingdom
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Location: Bristol, UK
Question Soft baffles - surely these will help?

I have a pair of wall mounted 5.5" tops, and was thinking of using some excess rockwool RW3 (60Kg/m3) to create a soft baffle increase, in the hope of reducing both boundary interference and also baffle diffraction.

I was originally hoping to mount as below, but still would keep the baffle diffraction issues:

Click the image to open in full size.

Hence, moving to a "pyramid" type scheme as as below. This would be quite a pain to make.. Do you feel it would be worth it?

Click the image to open in full size.

Worth it or shall I put my efforts elsewhere??

Thanks
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Old 6th July 2019, 08:53 AM   #2
Bill Coltrane is offline Bill Coltrane  Netherlands
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Diffraction occurs when there's a change of acoustic impedance.

So to minimize it, limit the impedance change.


An option I would consider is to use wood instead of rockwool at 45 degrees angle or less and make a pyramid.
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Old 6th July 2019, 08:57 AM   #3
zerokelvin99 is offline zerokelvin99  United Kingdom
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Quick reply, thanks!

I just have so much of the bloody rockwool left

Do you feel 45 degrees would suffice? Is it worth rounding the edge next to the speaker and keeping it tangential?

May try it in wood tomorrow if I get the chance,
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Old 6th July 2019, 09:08 AM   #4
Bill Coltrane is offline Bill Coltrane  Netherlands
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Less degrees is less impedance change, so less diffraction. I don't know what is optimal.

Then there is baffle step compensation to take into account. If you change the box, this must change to. So you probably need to change the crossover to.


But I think it is fun experimenting with this.
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Old 6th July 2019, 09:10 AM   #5
zerokelvin99 is offline zerokelvin99  United Kingdom
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Location: Bristol, UK
I run the speakers through a miniDSP, so not too worried about the baffle step compensation. If there is a simple passive filter I can compensate for it!

I think 45deg is the best starting point for WAF maybe.. I'll see how it goes from there!
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Old 6th July 2019, 09:21 AM   #6
Bill Coltrane is offline Bill Coltrane  Netherlands
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With minidsp you can compensate for baffle step.

Measure off axis to!
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