No, if you look at the formula, the width of the slots (or distance between the slats) equates in the center frequency of the resonator.and Rod in his book on page 179 says they need to be within 1/16th of each other /quote Does this read that the measurement used as the space between slats should be consistent to within a 16th of an inch? Or is one 16th of an inch the actual dimension suggested?
ceiling for a slat resonater?
Originally posted at johnlsayers.com, topic 10346.
So, I'm going to try and clear a few things up in my mind here. Say I have a 18 ft long slat resonator straddling a corner. Now lets say I divided up the 18ft into 4 different cavities (A,B,C,D). Are you saying that in cavity A I should have a different slat width and slot width from cavity B, or are you saying that within cavity A the slats and slots should be of varying widths? Also, I'm curious about the varying depth issue. Is Rod actually saying in his book that within a slat resonator like mine if the depth of cavity A is different than the depth of cavity B there is a broadband effect? That would jive with you and andre are saying also. I took what Rod said to mean that if the depth varied within a single cavity (like my example straddling a corner) that there would be a broadband effect. this does not jive with what you guys are saying. thanks again on the help clarifying this.you want to vary the cavity, slats, slots, etc. to create a number of highly efficient slat resonators covering a wide a range as possible and position them to if they're sitting on mode locations etc that they are effective for that range of frequencies as well. Andre was right (even if he's been grumpy lately ;-))
I do not have his book but purely wanted clarification on this one line. A 1/16th of an inch slot and a 1/16th of an inch tolerance are two different things so I am still uncertain as to which you refer :) ?
But since I have no need for slats or slots I'll simply go away ;)
Thanks.
It depends on what frequency range(s) you are trying to absorb. There is a Helmholtz resonator calculation spreadsheet in this website here. When doing calculations, bear in mind that around 20% open area and greater there is no resonance effect. There is the effect of the slats acting as a low pass (reflecting highs) filter. AndreSay I have a 18 ft long slat resonator straddling a corner. Now lets say I divided up the 18ft into 4 different cavities (A,B,C,D). Are you saying that in cavity A I should have a different slat width and slot width from cavity B, or are you saying that within cavity A the slats and slots should be of varying widths?