In Reply to: Most drivers offered for home audio do not use 4" voice coils posted by Edp on December 21, 2023 at 09:11:48:
I've just looked up my own bass drivers' voice coils. They are 4" but the latest version has coils of 6" (153 mm) on their 12" drivers. I don't know who Avantgarde source their drivers from or whether they manufacture them themselves, but AG certainly do the design work.The better modern drivers have large diameter voice coils as they can much better control the movement of the cone as a truly rigid piston. The cone is what agitates the air and allows us to hear the music. The less the cone "waves" as the centre is pushed in and out, the less distortion there will be.
I don't doubt that the Dynaco A25 was a great speaker in its day, nor that the new version is not a good driver for DIY projects, I'd suggest that it isn't a great driver.
The argument about its need or otherwise for protection from higher frequencies is not really relevant, as few drivers of that diameter will deliver high frequencies, so it's generally best to filter them out at the XO stage. Far more important of course is to protect the tweeter from bass frequencies.
Edits: 12/21/23
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Follow Ups
- But the Best Ones Do - cawson@onetel.com 12:06:49 12/21/23 (4)
- There are no 4 in voice coils offered by scanspeak, SEAS or Focal - Edp 13:30:05 12/21/23 (3)
- admittedly, not for 89 dollar loudspeakers, though! :) - mhardy6647 06:49:15 12/22/23 (2)
- Haven't been able to use my A-25s yet. One grille is broken. Do you - alaskahiatt 12:49:50 12/22/23 (0)
- 79 US smackers in 1973 = $570 in 2023 (by CPI) - mhardy6647 08:20:18 12/22/23 (0)