My ESL attempt

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Tnx!

chinsettawong: It depends on my choice of xo-filter. Not sure if I’m going to use a passive or active yet. Sound from each panel is good, but how good is hard to tell before I have them working full range.

arend-jan: Yes, I’ts a 10mm wide spacer. There is a second one masked by the TEAC drive in the picture, so the panel is divided into 3 sections.

/R
 
I have routed grooves in the frame, where the panels then are press fitted. I'm using 1.5mm PVC strips glued to the panels to adjust to the 8mm groove.

In the picture you can also se the 19mm slot needed for the stator conections to fit in the frame.

ELESH51.jpg


Spacing for the tweeter is 1mm and for the midpanel 2mm.

The sections in the midpanel are not exactly the same, but there is only abt 2cm differance, as it was only intended to be used from ~150Hz.

Perhaps you want to wait and se if it works before you copy! 😉

/R
 
SM7UYJ

Stator + 2 mm air +mylar films +2 mm air +Stator?
If here it is affixed 3,8 Kv - the excellent total!
DIY a microphone make of condenser microphone Panasonic WM61
Excellent microphone! + a computer with Audigi 2 and soft Spectralab - you will measure precisely. Give on the panel pink noise and measure a microphone.
Good luck to you
 
Yes, It probably will be a problem - the question is how big!?

But as this is my first attempt to make an ESL speaker, I taught a hybrid would be a nice way to start.
Later perhaps I'll give a fullrange a try! 😉
Right now it's playing in my work shop with the woofer in OB, and it sounds good so I'll not make a sealed box to start with!

/R
 
I have heard that the sound of the woofer would not be as fast as the ESL.


chinsettawong: Many have heard those same claims, but in my probably insufficiently humble opinion, those who claim dynamic woofers are too slow for ESLs are either blindly repeating what some other uninformed audiophile said, or don't understand the underlying physics, or both. The notion of woofer speed is problematic to begin with, but it can reasonably only be taken to refer to risetime or decay time. The risetime is determined by the highest frequency the woofer is asked to reproduce. For all intents and purposes, woofers with low pass filters have their risetimes limited by the cutoff frequency of the low pass filter. It has nothing to do with the operating principle of the driver. The decay time is (perhaps loosely speaking) determined by the Q of the driver/enclosure system and the system's resonance frequency. Again, it has nothing to do with their operating principle.

There may be difficulties matching dynamic drivers to ESLs but I think those difficulties generally result from differences in radiation pattern: dipole vs. monopole if sealed, and point source vs. line source if a single woofer is used. I don't think woofer "speed" has anything to do with it. Of course I stand ready to be corrected.

Few
 
Thanks Few for your explanation. I agreed that a lot of people might have just copied what other had said about the speed without even actually have heard it themselves. Those people are like me. 🙂 I think the best way is to try it out - which probably I will.

About the frequency response, I just finished my ES headphone and a headphone amp that goes together. I can't believe that the bass response from my headphone can go so low. It's even better than other commercial headphones I have ever heard. So, I come to wonder why can't the ESL speakers produce the same low frequency? Is it a matter of the low frequency sound produced not being heard from a far as compare to headphones?
 

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Hi,

Few is right. Slow dynamic base versus lightningspeed ESL is a Fairytale created by people with too low knowledge drawing the wrong conclusions when listening to inferiorly executed hybrids.

Good integration of bass and panel is a matter of distribution character and filter-characteristics --- nothing else, as long as the upper bandwidth limit of the bass is >> than its working range.

HPs are listened to in the very near range, while a speaker suffers from the acoustic phase cancellation which is a factor in farfield-listening. Additionally the HP and the ear canal form kind of a small cavity which assists bass response. This helps restore bass because most HP-panels feature basic resonance frequencies ~100Hz.

jauu
Calvin
 
I totally agree with Few, "speed" is an ill chosen expression when we are talking about woofers. What I do believe is that besides the already mentioned radiation pattern, stored energy and perhaps enclosure problems (resonances) may be responsible for the acclaimed bad matching.

If I were to build an ESL with low frequency support by dynamic drivers, I'd take Calvin's approach and build a line array of long throw woofers in an open baffle (alongside the ESL).
 
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