Home Speaker Asylum

General speaker questions for audio and home theater.

But the Best Ones Do

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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