TQWT (again?) help

[Zen Mod]

Anyone willing to solve this case ?
I need measures for tall (not folded) TQWT
I know that overall dimensions are not critical,but vent certainly is;

This is what I measure ,using procedure from JBL Speaker Shop.
Unfortunately,I don't have way to measure Xmax,if needed

TIA

old Scan Speak Alnico driver

21W38

Fs=64Hz
Qms=3.054
Qmc=3.308
vas=20.6L
Cms=0.2508mm/N
Mms=24.66gr
Rms=3.246kg/s
Sd=240.52cm^2
Qes=1.155
Re=3.7E
Bl=5.6537
Qts=0.83
Eff=0.4509%
Spl=88.74db

[hlj]

Hi seems only live tqwt thread, I am in the process of building a peer of ml-tqwt's, and I was wondering if it makes any difference to mount the driver on the opposite side to the port, i.e. port on back of enclosure?

Thanks

[GM]

Greets!

Have you tried MJK's Classic TL designer? It does a pretty good job, certainly far better than any of the old rules-of-thumb that folks have traditionally used: http://www.quarter-wave.com/Theory/Alignment_Tables.pdf They can be a little confusing if you're math challenged, so there's some insight in this recent thread if you need it: please help with MJK's alignment tables

WRT Xmax, I don't know about the SS drivers, but with underhung AlNiCo motors, the highest I've ever seen published is on a 15" at ~4.6 mm, so being a ~8", I imagine it's <3 mm.

GM

[GM]

Originally posted by hlj
Hi seems only live tqwt thread, I am in the process of building a peer of ml-tqwt's, and I was wondering if it makes any difference to mount the driver on the opposite side to the port, i.e. port on back of enclosure?

Thanks

Greets!

So? Why 'hijack' his thread instead of starting your own? Anyway, it matters, but normally in a positive way to vent out the rear, with best being downfiring, to help attenuate undesirable higher order vent output.

GM

[hlj]

Thanks GM

So? Why 'hijack' his thread instead of starting your own?

Sorry mistook as a general help thread for tqwt info. i will also check out the link you provided.