I can only talk after reading other people's research, but paper for speaker cones was discarded in the late 60's by BBC designs because then it seems, it was too variable from batch to batch for their purpose. Today, nothing like the same issue as other fibres can be added to the gloop ;)
That was a very big issue for the LS5/1 speakers variability between bass drivers lead to the LS5/5 design then the LS5/8
Aye, consistency tended to be the issue with pulp based cones in the '60s & '70s. At least in terms of the base material[s].
The JBL D130 or one of it's later brethren (E130, E140 or E150) might be an interesting proposition
While not common, they can be found in the UK.
http://www.lansingheritage.org/html/...omp/d130-2.htm
Thank you for the info will check out one of the E seriesQuote:
Originally Posted by BTH K10A
Simon :)