Now it makes sense...a 414 ceramic with a 417 kit in it.
Not really gonna sound like a 417 since ceramic instead of Alnico. But prolly close.
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Now it makes sense...a 414 ceramic with a 417 kit in it.
Not really gonna sound like a 417 since ceramic instead of Alnico. But prolly close.
This is very Un-Scientific...but, I have had about 9 Post 1972 White
Framed 417 frames reconed by Bill, and they all had tight Gaps...that is
if you gently checked with your hand .. thru-out the whole diamater
of the outer edge of the cone...I always found an area that sounded
like the cone would rub. Sometimes just a inch or less in one spot,
some times like a clock, @ the 3, 6, 9 o'clock positions. This never rubbed when used.
It is my opinion is that the Alnico Frames had tighter gaps than the later 917's. Tighter manufacturing tolerances on the old frames?
Maybe due to the Higher Gauss of the Ferrite magnet.
I also had a NOS OEM 417-D with Aluminum VC support
that was really tight, that Ted Weber was certain it was not a 417 Kit..It is.
No rub anywhere without a little extra movement.
I have had one set of light Black Ceramic frames re coned by Bill with his cones' and another set with 1 OEM NOS H kit and the other was a H-II kit.
None of these 4 kits show any sign of rubbing when pressure is exerted on them.
The 917, 1983 spec show that the SPL is 97...but the stats say 1W @ 5 cu'.
As always, I may be wrong but the 417's were tested @ 1 W @ 3 ft or
1 watt @ 1 Meter...quite a bit of difference.
So the 412, 414, 601 and all small Alnico driver 12'' frame, I believe could have 417's put in them and the 417 frame with it's larger mag could take the afforementioned models. Of course,
The aforementioned does not speak of under, over hung VC's, nor Gauss of smaller / larger Mags.
Now, if there were both, vented and unvented Dark Gray Framed 12'' Ceramic frames, I think they were of One VC Gap and one Ferrite sized magnet.
Sorry for my musing, postulating, rambling opinion.
As Always IMBW.
Jeff
I think I have read in Altec as well as JBL's literature, that he Alum DomeQuote:
Originally Posted by Altec19
besides being a type of heat sink...It also attached to the VC with Hard
adhesive to help extend the HF.
The aluminum dome will contribute some overtones. Altec did it early on some extended range speakers, by the 60's it had fallen out of favor except for MI speakers.