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I am trying to wrap my head around the different models of Altec 414. From the limited amount of information I have been able to get from the web, the primary differences lie in magnet type, impedance,frame construction, and magnet return pot.
This is my current understanding - please correct me where I am wrong:
1. 414A - 16 ohms, alnico magnet, welded pipe/plate magnet return pot, curved frame, decorative magnet cover.
2. 414Z - same as 414A with no magnet cover. Found in factory-built enclosures.
3. 414B - 8 ohm,alnico magnet, welded pipe/plate magnet return pot, angular cast frame, decorative magnet cover.
4. 414C - 8 or 16 ohm, alnico magnet, cast stepped magnet return pot, angular cast frame.
5, 414E - 8 or 16 ohm, ceramic magnet, angular cast frame.
6. GPA 414B - 8 or 16 ohms, alnico magnet, angular cast frame, cast stepped magnet return pot. This looks exactly like a 414C.
Does anyone have insight to the differences in cone construction, voice coil, or magnet strength between models, especially between the welded vs. cast return pots?
Follow Ups:
I think your best bet is to ask the people at Great Plains Audio
(call don't email). They should know some of that stuff. IMO, the cast return pot is superior to the welded pipe/end cap design.There are some specs listed on the "Altec Lansing unofficial" web site.
The 8C and 8E models specs.the same electro-acoustically, frame/
magnet style may differ.
Edits: 10/31/16 10/31/16 10/31/16 10/31/16
One particular area of difference that I have found between the 414A and 414C (aside from the magnet return pot construction) is the magnet strength. The 414A is listed as 10,000 gauss while the 414C is listed at 9,000 gauss. This may account for the stated 3 dB difference in efficiency between the two. I'm not sure if it would affect the extension on the top end.
Hi,The current GPA versions measure around ~94dB.. While the earlier 414A/Z have been measured to have a higher sensitivity.. It's ~98dB based on independent measurements from Bill Woods, a guy from England, and another one from Eastern Europe. I don't have the links to the latter, sorry. I can't remember where I saw them.
Edits: 11/18/16
The GPA 414B looks identical to the 414C, but has a lower Fs (25 vs. 30hz), which may imply a slightly heavier cone and consequently lower efficiency.
Edits: 11/18/16
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