Thanks for sharing your experiments and results.
However, It seems to me that the 5/8" thick under carpet felt used by Hartley was a significant component in his testing. This is very different from your fiber board which appears to give the results expected of an aperiodic speaker. If I am wrong then perhaps you could give a us a more detailed description of your fiberboard.
In an optimally designed "Boffle" would the impedance curve be completely flat? I don't think this was ever addressed by Hartley.
However, It seems to me that the 5/8" thick under carpet felt used by Hartley was a significant component in his testing. This is very different from your fiber board which appears to give the results expected of an aperiodic speaker. If I am wrong then perhaps you could give a us a more detailed description of your fiberboard.
In an optimally designed "Boffle" would the impedance curve be completely flat? I don't think this was ever addressed by Hartley.
Here is a closed box with and without a variovent :
http://www.troelsgravesen.dk/W1501_95_files/15W_8530_K01_9500_imp_closed_Variovent_D.gif
http://www.troelsgravesen.dk/W1501_95_files/15W_8530_K01_9500_imp_closed_Variovent_D.gif
Here Ted Jordan is describing his Axiom cabinet, a kind of variovent i think so the idea is not new :
http://www.ejjordan.co.uk/PDFs/A-Cabinet-of-Reduced-Size-with-Better-Low-Frequency-Performance.pdf
http://www.ejjordan.co.uk/PDFs/A-Cabinet-of-Reduced-Size-with-Better-Low-Frequency-Performance.pdf
Aperiodic can be good with the right driver, but is often a compromised versus simple sealed box, where a small enclosure size is the prime goal. This here boffle clearly has multiple tuning frequencies and lots of damping would make it aperiodic, but I'm not sure either we want that; it would not be a boffle anymore. Hard to say what would be best from this point without hearing it though.
IG
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