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Started a new TM a few weeks ago with Rival R176CP woofers in a tapered TL and the (NLA) Vifa XT25BG60-04 in a Visaton waveguide.
Design is named after a magical monkey king from the Ramayana (Sugriva)
My normal method of modeling a TL is to run WinISD or Unibox models, and assume that bass performance will be similar in a TL alignment.
Here is the basic WinISD model:
25W power, 23Liter box, 2.5 inch port - 36Hz F3, 32Hz F6. 100.5 dB SPL passband