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Old 19th November 2008, 06:28 PM   #11
tmyr is offline tmyr  Greece
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hi there ..!!
take a look @ this old thread.. may be somewhat usefull..
happy building !!

..didn't know how they sound till i made me one..
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Old 20th November 2008, 11:34 AM   #12
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Quote:
Originally posted by arend-jan
[B]


At a large distance, a voltage driven ESL will have a rising response of 6db/octave with frequency. This is because the impedance is capacitive, hence current increases with frequency.

If you make a speaker (almost) has heigh as the living room then you speak of a line source. Sound waves can now only expand horizontally and not vertically. This changes the behaviour to a slope of +3db/oct for voltage drive and -3db/oct for current drive.

Hi


According theory, the excursions of an esl are lineair to voltage. So a headphone ESL should be perfect.
I assume the rising in output of ESLs in a room is only caused by the way sounds travels from ESL to your ears (e.g. beaming, interference) and has nothing to do with electrical effects.

Am I right here?
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drs M.J. Dijkstra
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Old 20th November 2008, 04:16 PM   #13
bwaslo is offline bwaslo  United States
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I think it has more to do with the front wave of the panel meeting with the back wave and squishing around the sides and cancelling, which happens less as frequency increases, up to a frequency determined by panel dimensions.

I didn't know a line source changed the frequency response rolloff. Isn't the "3dB per" a 3dB per each doubling of listening distance from the speaker? Or both?
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Old 20th November 2008, 09:13 PM   #14
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Quote:
Originally posted by MJ Dijkstra



Hi


According theory, the excursions of an esl are lineair to voltage. So a headphone ESL should be perfect.
I assume the rising in output of ESLs in a room is only caused by the way sounds travels from ESL to your ears (e.g. beaming, interference) and has nothing to do with electrical effects.

Am I right here?
You are 100% correct.

This is also nicely shown by the simulator when you enter a distance of 0.01m.
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Old 3rd December 2008, 06:49 PM   #15
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Hi Theo404,

just some thoughts...

try to get the low cutoff frequency as low as possible; a lot of the magic in music goes on around 1kHz (voices etc.).

When your panel has a low aspect ratio it may help to support the diaphragm with a few dots of silicone in the middle.

Keep your first prototype simple to avoid disappointments and eventual cancellation of the project... Once you have that first one working you can try harder designs with renewed motivation

Be very careful with microwave oven transformers, they can easily kill you! Besides their transformation ratio is probably too low for ESL use.

Have fun,
-Kenneth
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