[CW] Resonant speaker

[Henry Meils]

Hi

I experimented with resonant speakers back in the mid 70's. The results were encouraging and made me interested in loudspeaker theory.

My starting point was an article  "Adding audio selectivity by mechanical Means" in the ARRL's "Hints and Kinks" -- volume 5 (1954 issue), page 26, written by William Bruce Cameron. I don't have a scanner so I can't send it to you. You might get hold of it through the ARRL or by googling the author.

I understand that at one point, the Germans produced headphones where the diaphragm spacing/tension could be adjusted to peak at a particular frequency. 

Regards,
Henry, OZ1UF-Copen.

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