I'd like to get the rules how the engineers calculated their speaker enclosures.
Nowadays they use Thiele-Small parameters. Taking a look on old brocjures from Altec, JBL, Jensen, RCA .... there are no Thiele-Small-parameters listed because this was the age before - some call it the golden age of audio.
What parameters did they use and how they calculated the enclosures?
Does anyone can deliver / give me parameters from
RCA MI1444
RCA MI9449 (CX)
Jensen G610
Jensen H530
or from some old Fieldcoil drivers of this generation?
Thank you for your help and passion.
Joao