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In the Forum: Audio Discussions
In the Thread: Romy The Cat's new Listening Room
Post Subject: Tuning Helmholtz ResonencePosted by Albert on: 5/10/2010
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 Romy the Cat wrote:
After a few hours of moving the right channel (digital crossover was not used) this is what I was able to come – right channel bass section with no filtration. This is the very best among the worse and as you can see it is very unusable. What I am thinking from here is to cut at ~50Hz with 3rd-4th order and rise gain for 5-6dB.


Romy,

If you could tune the resonence of the Helmholtz resonator, moving the middle of the resonence up or down. it looks like it is at 63hz. Moving it down to 47hz or up to 75 or even 112 would smooth things out and help to avoid high order x/o. The question is how to tune it?

http://www.phys.unsw.edu.au/jw/Helmholtz.html

I think it is then a function of mass of air in opening vs mass of air in the chamber. So in your case, the area x thickness of the opening to rotunda and the volume rotunda. In your pictures i do not see a clearly defined neck to rotunda (as in bottle example) so has me question is rotunda as Helmhertz source of 60hz peak?

If it is, then reduce volume of opening to rotunda and force the resonence up.

Many variables here and i question if efforts would pay off...

How certin are you that it is Helmhertz of rotunda?
Rotunda Helmhertz.JPG

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