'deflection of the membrane' of a woofer/(loud)speaker ?. . .

Hi Daddy!
I wonder if there is an actual "Fachbegriff" for this in English. YOu're not sure, are you?

... ist doch nichts anderes als eine periodische Auslenkung.

http://www.patentstorm.us/patents/6628799/des...


It has been found out that in the woofer unit or full-range unit, ...... thus preventing any possible abnormal diaphragm vibrations, lowering the enclosure ...

Woah Helmi, did you read through the entire complicated text to find that?
I wonder which word is better...

Amplitude ist m.E. nicht die Auslenkung an sich, sondern der Abstand von der Nulllinie zum Maximum der Auslenkung...

Ich glaube, deflection ist richtig, auch wenn ich es genau nicht weiß; elongation könnte vielleicht noch passen...

excursion: The movement of the cone or diaphragm of a speaker. Higher volts or amps will increase excursion.

http://www.amazon.com/gp/feature.html?ie=UTF8...

...even though the speaker diaphragm may exhibit small excursions relative to diaphragm area...
http://www.wipo.int/pctdb/en/wo.jsp?IA=US1981...

I'd say, but Helmi's suggestion gets the idea across too. It depends how literal and technical the text needs to be...