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Kardinaal 13th January 2013 03:53 PM

diy build: questions about wire stators: ideal distance from each other and diaphragm

I'm new to this forum (allthough not new to building ESLs). At the moment I've got a standard set of L/R full range ESLs that died on me a few days ago, so I'm looking to build me a new system. Since I like to challenge myself (to insane degrees sometimes), I want to build my next system a little more complicated...

The idea is to build a 4.1 surround system (4 sets of 2 ESLs, and a normal cone subwoofer), with separate ESLs for hi (tweeter) and mid ranges. The idea is to tweak the size of the diaphragm, distances between stator and diaphragm, diameter of the wires, the distance between the wires, and even the input signals, to get the best possible sound quality.

First question: Anyone got an idea if splitting the high and mid ranges is worth it sound quality wise?

Second question: Anyone have any idea of ideal sizes and distances, or where I can find the necessary physics to do the calculations? There were internet resources for this ten years ago when I built my previous set of ESLs, but the links I saved from those long gone days are dead and buried (even the way back machine came up empty).

So, what do you think?

thanks for reading, and greetings,


tyu 13th January 2013 04:08 PM

Search....theres tons of ESL info here on this site...all most can do is say the same thing thats been said this site great or what... other well have input but you can get started now!..........good luck

Calvin 14th January 2013 12:07 PM


sounds like a set of 4 FR-ESLs and one Sub. If the ESLs are required to go way down below 100Hz then flat wire stators are best.
100Hz requires at minimum 1.5mm diaphragm-stator distance with large sized panels. With modest sized panels 2.5 to 3mm are more feasable.
No separation of low-mid and mid-high. Its just an unnecessary crossover point, generating problems and spoiling sound. Wire stators lend themselves for electrical segmentation which is kind of elegant transducer-internal crossover in that it reduces the active membrane area with rising frequency.


lcsaszar 14th January 2013 03:06 PM

Don't the wire stators act as kind of harp strings?

Bazukaz 14th January 2013 04:14 PM

I am running a flat wire ESL(~0.35 sq. meters) with a D/S spacing of 1.4 mm down to 100 hz. No problems with excursion limit as long as main resonance frequency(@60Hz) is filtered. A 24db/oct active filter is required.

A wire ESL has some advantages over other types :

1) Robust and reliable , i.e no arcing, safe to use.
3) Dispersion can be controlled by using different electrical segmentation; can be from fair to very good.

In my opinion the open area is best around ~20%-30% to have some damping on diaphragm. This means you have to use a lot of wires.
Others may have a different opinion about this.
If you want to use separate diaphragm areas for high/mid range you could split the panel into segments both electrically and mechanically. Its a common practice, but usually not used with wire ESLs.
In theory this could allow for lower intermodulation products but IMO for a well build wire ESL that is not required.


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