Thanks for implementing my suggestion to make your posts more readable.
Now to your first question:
With the static weight of your eBay cone kit being around 105 grams, the missing weight comes from the "airload" that will be anywhere from @ 16 - 20 grams ( dependent on various numbers related to the suspensions compliance ).
- Add that airload number to your own numbers and one gets an MMS for the 2234H that's correct.
If one studies the following link ( from the LoudSpeaker Database ) one can build up an understanding of "airload" by comparing the differential seen between the MMD & MMS numbers ( for various 15" woofers that I've preselected ).
PreSelected 15" Woofers at the LoudSpeaker Database for study
At the following link is an overly simple formula for deriving "AirLoad" from a manufacturers published MMS figures.
- Unfortunately the numbers derived are a few grams short due to the formula not fully taking into account the compliance of the kits suspension ( which the hidden formulas over at LoadSpeaker data base obviously do )
A Simplistic Formula for deriving "AirLoad" from a published MMS figure
Your comment of:
"i doubt that if i abuse it to death it will come down to the jbl advertised 22hz."
That's a little bit more concerning.
- I'm guessing that the maker of your aftermarket kit is using a spider that is one category too stiff.
Still, 30hz is a pretty good number to start off with. The Fs of Altec 416 woofers are mid to high 20's ( for some reference ).