Soundking drivers?

[catorg]

I think of doing my own TQWT (folded), and was yesterday hunting for
the right driver. Now this is here, Bogotá-Columbia, not easy. There
are 3-4 brands (china? India?) presents on the market, RPsound,
supertone and Extreme sound. No clue, no spec, nothing in internet and
nothing to get from the numerous sellers, only diameter, wattage and
ohms.
There's a 4th with name AS-american sound. AS exists in the web,
selling mostly PA-speakers, and these have the same logo, but I am not
sure these are not imitation.
Is this possible, with a laptop, microphone and multimeter to find out
at least the resonnanz freq of a speaker?
The more serious brand is Soundking. There's at least a website
soundking.com with some specs of the drivers. I found a coaxial
driver.
here the specs:
http://www.soundking.com/html/Produc...Speaker___Driv
er/5/2011/0212/378.html
Coaxial 12'
8 ohm
250W
65-5000hz & 700-20000hz
fs 50 hz
84 liters Vas
Qts 0.34
Is this driver ok for a tqwt (if no, which load would be better for
this speaker)?
Would it deliver honest bass at 32hz, or till which freq more/less?
Thanks in advance