Speaker issue?

[Twincam]

Bit of an odd one ive just been cleaning a speaker and I decided to give the cone a little push as if testing the voice coil, and the cone moves very easy worryingly easy. Ive did this little test on all sorts of speakers and they have all given much more resistance. The speaker works perfectly.
This is the original Trace Elliot speaker in a 7215smc.

I'm just wondering why this is? I know there could be many many reasons im surprised still at its ease of cone travel.

Edited January 29, 2016 by Twincam

[Bill Fitzmaurice]

Not all drivers have the same suspension stiffness.