Hi guys,
I've noticed something strange with the esl seg ui programme (at least strange to me). If you put in eg 2mm heart to heart wire distance and keep the total number of wires the same (eg 74) then you get a 81 or so dB output.
But when you increase the distance of the wires to like 5mm with the same nr of total wires then the output rises to ~85dB, off course the total width of the membrane area rises too but I thought that when you space you're wires too far the electrical field isn't strong enough, so how can the output rise then ?
Could be a silly question but I was just wondering ...
I've included some pics
I've noticed something strange with the esl seg ui programme (at least strange to me). If you put in eg 2mm heart to heart wire distance and keep the total number of wires the same (eg 74) then you get a 81 or so dB output.
But when you increase the distance of the wires to like 5mm with the same nr of total wires then the output rises to ~85dB, off course the total width of the membrane area rises too but I thought that when you space you're wires too far the electrical field isn't strong enough, so how can the output rise then ?
Could be a silly question but I was just wondering ...
I've included some pics
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The answer itself seems logic, but what about The electrical field strength ? If you space The wires 10cm each, efficiency will rise again but there's a huge gap between The wires ... Doesn't The field strength go way down this way ? The total openness this way will be huge too ...
ESL seg ui is a convenient tool for calculating response for segmented line source ESLs made with wires. However, there are many assumptions built into the calculations. Most of them are listed in the first post of the other ESL seg ui thread: http://www.diyaudio.com/forums/plan...tor-esl-simulator-esl_seg_ui.html#post2908293
The issue you mention, loss of field strength with widely spaced wires, is not considered in the calculations. The field strength is assumed to be uniform no matter what the spacing, so the calculated acoustic output will scale directly with the capacitance (ie width) of the segments. To avoid any loss of efficiency keep the diaphragm-stator spacing > openings between wires. (ie keep d1 > d2 in the attached figure for uniform electrostatic field).
Some details for estimating efficiency loss with large stator openings can be found here: http://www.diyaudio.com/forums/planars-exotics/246846-first-time-esl-builder-12.html#post3881204
The issue you mention, loss of field strength with widely spaced wires, is not considered in the calculations. The field strength is assumed to be uniform no matter what the spacing, so the calculated acoustic output will scale directly with the capacitance (ie width) of the segments. To avoid any loss of efficiency keep the diaphragm-stator spacing > openings between wires. (ie keep d1 > d2 in the attached figure for uniform electrostatic field).
Some details for estimating efficiency loss with large stator openings can be found here: http://www.diyaudio.com/forums/planars-exotics/246846-first-time-esl-builder-12.html#post3881204
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