Tannoy Dual Concentric 12" - Small Cabinet

Signal Generator+Multimeter VS. SMD IM-SG ( multitool? )

Hello again
I´m starting to understand things, but still in a very simple / elementary way.

INFO:
I have now found a second site with different TS parameters located here:
http://www.hilberink.nl/tannoy/jpvanson/drivers.pdf

The second TS parameters differs from the first TS parameters I found; located here: Tannoy Monitor Thiele & Small Parameters

I want to do this right the first time.

QUESTIONS REGARDING IMPORTANCE OF CORRECT TS PARAMETERS:
1. How exact does these measurements have to be to get a good enough / proper result?
2. Will I hear the difference on speakers with TS parameters measured for exact driver / vs. / using one of the standard TS parameters for the Tannoy Gold 12" found on net?


WHAT IS THE EASIEST ( money is always a parameter here too ) WAY TO MEASURE TS PARAMETERS OF EXACT DRIVER:
It looks to me that this unit does it all: SMD IM-SG (Impedance Meter / Signal Generator) - including tuning of bass port.

I have a multimeter, I could probably get a signal generator / or / digital signal generator software + sound card for the same job: but I´m really considering the first option because of the simple interface...

What should I do?
 
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I decided to go with the Chevoit plans for my build. Extra braving and all in bamboo ply.
Sounds great. Tight bass control and clear highs. The Mods are the highlight though.


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Hi! I just purchased a pair of Tannoy Monitor Gold 12" drivers and am looking to build the same CHEVIT cabinet you made. Can you send me the plans for your cabinet please? Thank you! My email is renanj@outlook.com