Guitar Cab transducer T/S parameters

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Dear All
I`m looking high and low for some Theile Small parameters for transducers used in Peavey,Marshall and others good guitar CABs preferably 12inch x 2 or x 4 .can anyone help in providing a link or some data?
I`m thinking of making these transducers my self and test them out.
Thanks in advance
 
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