Hey Guys,
Has anyone seen an egg shell used or should I say glued to the centre of a late 30's radios speaker ? I have a 12" electro mag that has a shell perfectly glued onto the centre of the cone perhaps sued as d ust cover ! I was told by a collector that he has seen this method some time back, any idea's ? How do I load photo's please Rob to show this ?

Mort

G'day Mort,

You can e-mail photos to me and I will upload them to the server for you. My e-mail address is on my profile page.

My father told me many years ago of that trick of using an egg shell glued to the speaker's center. Early form of "wizzer" cone, meant to increase the treble response of the speaker.

Would this work in a similar way to double-cone speakers, the ones with a small cone glued in front of a much larger one? AWA did this with some of their speakers back in the 1950s but the trend seemed to disappear quickly to be revived in the 1980s with the boom in HiFi gear.

Ahhh... but which way is the egg shell? Does it hatch an interesting discussion, or cause a fowl sound?

"Would this work in a similar way to double-cone speakers, the ones with a small cone glued in front of a much larger one? AWA did this with some of their speakers back in the 1950s"

That's essentially it, though I doubt any manufacturer used egg shells in production. Think only hobbyists and DIYers used egg shells. Just raid the kitchen garbage after fried eggs were made...

That's essentially it, though I doubt any manufacturer used egg shells in production.

That's about the size of it. AWA and indeed other manufacturers used a smaller cone made of harder paper, about the size of a medicine glass. Unfortunately I no longer own the speakers that had these extra cones but if I find an image of a similar speaker I will add it here.