What is Mt ?

[terryaaa]

I guess I'm to old school; (and so are T/S) I'm not familiar with this term.
The DIY search engine, nor Google, are finding me much either.
But I know it's been talked about in here. Just not getting a hit.
So I'll post it as a question for future searches.
Could someone also suggest a way to derive it from other Parameters.

Thanks
Terry

[glennb]

Big M, so its a Mass. Little t, test. A mass that is attached to a speaker cone to help measure the TS parameters, usually plasticine or blue tack.

[terryaaa]

Thanks Glenn;

That makes a lot of sense; here is the context in which I found "Mt"

Bl =sqrt(2*pi*Fs*Mt*Re/Qes) So I thought maybe it was Mms + ? =Mtotal

This was under the topic of deriving "Bl" from other Known values.