T/S parameters equations

[rayback]

I'm looking for a website that has all t/s parameters equations for finding different parameters.
How do I find Qes?

Thanks
Ray

[antiresonant]

Originally posted by rayback
I'm looking for a website that has all t/s parameters equations for finding different parameters.
How do I find Qes?

Thanks
Ray

Speaker "Qes" (I.E.: electrical component of "Qts") is proportional to Re/BL². But, in reality the "Re" includes the "Rg". Thereby:

Qes = ß ×( Re + Rg )/ BL²

where: ß = Sqrt[Mms/Cms] ... I provide for purposes of completion. However, since they're constant thereby irrelevant in this example, we'll just through it into a single arbitrary constant for clarity.
Now, if we plug "Qes" into "Qts" (I.E.: total speaker Q which is analogous to acoustic "Qh") which also includes "Qms" (I.E.: mechanical component).

Qts = Qms × Qes /( Qes + Qms ) = Qms /( 1 + Qms/Qes )

Br.

Vidar

[antiresonant]

Sorry, I forgot something:

Assuming an ideal driver or one that that has conjugate/Zobel filters such that the driver's effective impedance is "Re". We know the efficiency is cut because of "Rg" (resistance of everything between the amp and the woofer including your amplifier's output impedance (I.E.:"Zo"), cable impedance, L-pads, & RDC of inductor coils) by:

SPL = 20 × Log[Re/(Rg+Re)]

Br.

Vidar

[rayback]

Thanks for the reply.
Where did you get the formula from? do you have a website or something?

thanks
Ray

[jahonen]

Rayback,

have a look at the DPC documentation:
http://home10.inet.tele.dk/cfuttrup/. Claus has written nice documents for DPC. FORMULAS.TXT is the file you are probably after.

Regards,
Janne