Given the big Lii Audio driver is of a high Qtc of 0.79...and has a 8+mm of Xmax...and a very uncontrolled Qms value...The driver sims as wanting to be sealed, has a mid-twenties F3...the enclosure size is rather impractical....has anyone tried an aperiodic enclosure?
No, my cheap open-baffle days are long gone, and I "don't believe" the hype of baffle-less proponents.
The actual mathematical science of Aperiodics has not been put to paper & calculator as of yet.
Thoughts?
-------------------------------------------------------------------------Rick....
No, my cheap open-baffle days are long gone, and I "don't believe" the hype of baffle-less proponents.
The actual mathematical science of Aperiodics has not been put to paper & calculator as of yet.
Thoughts?
-------------------------------------------------------------------------Rick....
Other than Altec, et al prosound type alignments, the vast majority of my builds were with cheap components out of open back and/or bottom tube, early SS era radios, consoles, automobiles, i.e. weak motors, so all were ~aperiodic since I always reflex vented them and when 'critically' damping the vent didn't get rid of its 'hangover'/'boom' it became a stuff to 'taste' with cotton batting and/or FG insulation which was always in abundance for the asking/taking.
To me then, this driver is fundamentally no different, so would use the same measured Vas/1.44 tuned to measured Fs the pioneers taught me and use my ears for the rest if for myself or to its owner's.
If Vas is as large as published and size was an issue, then as big as I could, but still tuned to Fs.
After I learned about TLs and what we now call the various types of MLTLs, this became the norm and for the most part no longer adhered to the Vas/1.44 criteria or even T/S, which I didn't learn about till my waning years of active DIY in '81.
As for a mathematical solution, there's Ted Jordan's ARU: http://web.archive.org/web/20190108...ize-with-Better-Low-Frequency-Performance.pdf
A bit more recent one: https://vtechworks.lib.vt.edu/bitst...655.V855_1988.S432.pdf?sequence=1&isAllowed=y
Most recent AFAIK is Rick Shultz's Alpha & Omega based on George Augspurger's work [can't find the Omega doc, but it's basically a stuffed ~0.21 driver offset MLTL IIRC]: http://diyaudioprojects.com/Technical/Papers/Alpha-Transmission-Lines.pdf
To me then, this driver is fundamentally no different, so would use the same measured Vas/1.44 tuned to measured Fs the pioneers taught me and use my ears for the rest if for myself or to its owner's.
If Vas is as large as published and size was an issue, then as big as I could, but still tuned to Fs.
After I learned about TLs and what we now call the various types of MLTLs, this became the norm and for the most part no longer adhered to the Vas/1.44 criteria or even T/S, which I didn't learn about till my waning years of active DIY in '81.
As for a mathematical solution, there's Ted Jordan's ARU: http://web.archive.org/web/20190108...ize-with-Better-Low-Frequency-Performance.pdf
A bit more recent one: https://vtechworks.lib.vt.edu/bitst...655.V855_1988.S432.pdf?sequence=1&isAllowed=y
Most recent AFAIK is Rick Shultz's Alpha & Omega based on George Augspurger's work [can't find the Omega doc, but it's basically a stuffed ~0.21 driver offset MLTL IIRC]: http://diyaudioprojects.com/Technical/Papers/Alpha-Transmission-Lines.pdf