Altec 414-8B T/S parameters ?

[shacard]

Hi,

I'm looking for the Thiel-Small parameters for an Altec 414-8B.

All i have found is from www.thielesmall.com database :
Vas [Liters] 379,62
Qts 0,254
Fs [Hz] 29
Max Power [W] 50

S.