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Hi,
No, it should be adapted to the new settings.

Stéphane

Hi,
The data for the speakers 414

http://www.greatplainsaudio.com/altec_thiele_small.html

Thiele-Small Parameters


Model Number: Gpa 212-8A
Free Air resonance (Fs): 51.2 Hz

Hi,
If the parameters of the GPA 212-8A are the same as those of the ALTEC 414, can have a try with "petite Onken"

http://www.asrr.org/biblioteca/Revue%20Audiophile/FICHIERS/25/ONKEN/ONKEN.html
...

Here, a commercial version

http://www.blumenstein-ultra-fi.com/index.php?page=amplifiers
http://www.pinkfishmedia.net/forum/showpost.php?p=1416990&postcount=79

Stéphane