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gdmoore28
01-24-2016, 07:26 AM
Following is a post made at the Altec Users Forum:

After searching for a year to find the T/S parameters for my 416-8Zs, and finding none (and having no measuring equipment of my own), I've finally run across an Italian gent who actually measured a pair for his own project. For those who may have been seeking same, here arehis findings.


Altec 416-8Z

Fs..................25.098Hz
Vas................735.167 liter
Qts................0.334
Qms...............4.222
Qes................0.363
Le..................0.567mH
L1..................1.042mH
R1..................11.595 ohms
Re..................6.594 ohms


I've seen a number of people suggest that the 416Z has the same parameters as the 416B, but the author of this article notes the following differences:

Model : Xmax Re Fs Vas Qts Qms Qes
(inch) (cm) (ohms) (Hz) (cu. ft.) (litres)
416-8B Altec factory data 0.15 0.381 6.90 25.10 26.47 749.6 0.32 7.05 0.33
416-8Z Measured - - 6.59 25.1 735 0.33 4.22 0.36

(Sorry, could not get the above table to align properly once posted.)

If interested, you can read the whole story here: Audio Garage Gallery (http://digilander.libero.it/steveviso/audiogarage/viso485e.html#compo)

I've no interest in his cabinet design (for obvious reasons), but these figures can be valuable, especially if anybody can verify them.

GeeDeeEmm