Altec 604 E reconing options.

[charly1944]

Thanks GM for all this valuable information.
I am giving myself 2 months before i go to the GPA brand new solution.I am using this time to try to listen to them here in Paris.Meanwhile, i am looking actively for either a good pair of 604E in mint condition,with original cones and diaphrams ,to be sent to GPA for remag or in average condition,but at a low price ,to be reconed and restored by GPA. They are difficult to find .I see much more 604 C and D,some of them in pretty good shape,but i cannot find any specs about them.I understand that the C and D are pretty similar and read that their Fs is around 50 hz.This looks pretty high to me.That is why i am more interested in the E .Any solution, apart from a sub,to get some bass out of such drivers.Is a reconing of an old 604 D with 604 E diaphragms going to mitigate the problem or is it only an insult to collector without any added value in terms of bass extension.