Sorry of this has been discussed, searching for TSL and LTD isn't exactly concise.
I was considering making a box for the Dayton Epique E180HE
https://www.daytonaudio.com/product...-mmag-extended-range-subwoofer-4-ohm-per-coil
when I noticed over in Audioxpress that there is a huge difference in LEAP's TSL and LTD measurements of the Qts,
https://audioxpress.com/article/tes...e-subwoofer-from-the-dayton-audio-epique-line
and most people go with the LTD measurements, and the box difference is quite a lot, a 35L box compared to a 185L box (sealed, Qtc 0.5).
As I said it's hard to search the definitions of these terms, so I don't know what they mean, but I do notice that many people prefer the LTD measurements over the TSL, what are they?
I was considering making a box for the Dayton Epique E180HE
https://www.daytonaudio.com/product...-mmag-extended-range-subwoofer-4-ohm-per-coil
when I noticed over in Audioxpress that there is a huge difference in LEAP's TSL and LTD measurements of the Qts,
https://audioxpress.com/article/tes...e-subwoofer-from-the-dayton-audio-epique-line
and most people go with the LTD measurements, and the box difference is quite a lot, a 35L box compared to a 185L box (sealed, Qtc 0.5).
As I said it's hard to search the definitions of these terms, so I don't know what they mean, but I do notice that many people prefer the LTD measurements over the TSL, what are they?
I would focus on the linear parameters unless you’re going to run nonlinear simulations (which I kind of doubt since you’re asking about this). I looked it up because I was curious, and found this link here, where pages 4 and 5 cover the difference. TSL are linear parameters and LTD takes nonlinearities into account. The reason is that Q, Fs, BL, Kms, impedance all vary with drive level / excursion, linear models treat these as single values. Unless you’re a LEAP user I wouldn’t worry about the various LEAP models too much (it’s old unsupported SW). Klippel’s LSI is the modern standard for measuring and characterizing nonlinear loudspeaker behavior, with LSI data and graphs are provided in the article. It would have been helpful to explain the difference in Qts if Vance had also shared the Klippel Qts(x) plot.