[sdiy] Dynamics and speakers, was:Advice

[Czech Martin]

I guess that the surface of the arc is very small.
So the radiation resistance is almost 0 at low frequencies.

If you want any audible sound at ~30 Hz you need a large membrane,
be it magnetically driven or electrostatic.

Plasma speakers are only tweeters.


m.c.

> -----Original Message-----
> From: owner-synth-diy at dropmix.xs4all.nl
> [mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of Dave Krooshof
> Sent: Mittwoch, 4. Februar 2004 17:22
> To: synth-diy at dropmix.xs4all.nl
> Subject: RE: [sdiy] Dynamics and speakers, was:Advice
> 
> 
> Ideally it's that same with speakers as with microphones.
> You want them to be point sources. Any surface bigger
> then the wavelength is hard to control.
> There's a sound to your speaker just because it has a size.
> 
> Then reverbs are a problem. You want your speaker to point
> at you, and not hit the walls, in order to recreate an acoustic
> reproduction of another space in your room.
> You do not want the characteristic of your room to resonate,
> so do not bang on the walls with your sound!
> 
> To make a tiny omni directrional speaker with hardly any
> mass is "easy". Make a tesla-coil, tune it to 44100Hz or
> double. Then do AM on that wave with the output of
> your cdplayer/computer/synth. Bigger or smaller sparks
> will produce airwaves. This is allready done, and it doesn't
> sound that bad at all. Beautiful transients!
> Pity about the ozone though.
> 
> For a bi-directional (figure 8) speaker I was thinking
> of a fairly big spark, on a constant rate, a multiple of
> 44100 to avoid moire-effect...
> Then move this spark back and forth with a magnetic field
> driven by your synth.
> 
> It might not be that efficient, but it will look hella-cool.
> 
> andah... actually... I am serious about the point source bit.
> Well, I am serious about the tesla speaker too, but for
> different reasons. I'm not trying to be funny, here.
> -- 
> --
> 
> groets,
> 
> _          >^v<        _
> 
> website http://www.dendriet.nl
>