[CW] Resonant speaker

[Henry Meils]

True there are modern super-effective electronic selectivity methods but 
there's fun in experimenting with different approaches and I found it 
amusing to be resonatng audio wavelenghts rather than radio wavelengths --  
makes you speculate about the analgous behaviour of Maxwellian described 
waves (electromagnetism) and Newtonian-mechanics defined waves (aucustics)--  
in fact I also built an LC circuit resonant at audio freqs., tuned with a 
ganged bc-band  variable air capacitor - just for the fun of it - this was 
based on a CQ article using a tuned AF amplifier. I also found it amusing to 
tune a LC circuit to peak AF response.

Henry, OZ1UF, Copen.

----- Original Message ----- 
From: "Ken Brown" <ken.d.brown at hawaiiantel.net>
To: "CW Reflector" <cw at mailman.qth.net>
Sent: Monday, August 31, 2009 9:03 AM
Subject: Re: [CW] Resonant speaker


>
>> I understand that at one point, the Germans produced headphones where
>> the diaphragm spacing/tension could be adjusted to peak at a
>> particular frequency.
>>
>>
> Some older communications headphones have very non-flat frequency
> response. I can understand how it could be helpful with an old receiver
> that does not have sharp IF filters and very little in the way of audio
> filtering. What I do not understand is how it can be much help with a
> modern receiver with really good narrow IF filtering and low pass audio
> filtering. The resonance in a speaker or headset would seem redundant.
>
> Ken N6KB
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