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My Second ELS Build.
My Second ELS Build.
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Old 24th March 2013, 04:13 AM   #1
fperra is offline fperra  United States
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Location: Lakewood, WA
Default My Second ELS Build.

If you missed my first build, you can find it here:

After completing these speakers, which I absolutely love, I decided to build a pair of sub woofers, each with dual 15" Tempest -X drivers. Well, the woofers turned out great as well. Unfortunately, they take up too much space in the AV room and one of them had to be stuffed into a corner. Acoustically, not a problem, but visually, not to my liking. Here are a couple of pictures which explain my displeasure:

Click the image to open in full size.

Click the image to open in full size.

Notice the sub in the corner on the left.

So I have decided to build a new set of electrostatic speakers that are narrower than the ones in the pictures above. The new ones are 10 inches narrower, so the extra 20" will give me the room I need to get the left sub woofer back into the listening area. Here's a picture of the new speakers:

Click the image to open in full size.

Once again I used quarter sawn white oak and the sides are book matched. Also I added an aluminum trim separating the wood from the grill cloth. The speakers aren't completed yet as I have to wire everything up. As before, they will be bi-amp'd with the ELS panels handling the frequencies above 600 Hz. After I get them up and running I'll post some more information.
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Old 24th March 2013, 07:40 AM   #2
ktuuri is offline ktuuri  Canada
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Looks very nice. I really like the grain on that Oak. Great Job!!
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Old 24th March 2013, 11:18 AM   #3
phazer99 is offline phazer99  Sweden
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What driver are you using in the line array and are you happy with its performance? I'm currently investigating the possibility to build a OB woofer panel that will complement my Spectra 11's in the lower regions down to about 50-60 Hz where the subs will take over.
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Old 24th March 2013, 12:54 PM   #4
CharlieM is offline CharlieM  United States
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WOW! The workmanship and esthetics of your speakers are really inspiring. I must say; your project, as well as Thomas's project posted yesterday, have really raised the bar.

Can you post a pic showing the rear view?
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Old 24th March 2013, 01:26 PM   #5
geraldfryjr is offline geraldfryjr  United States
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Do let us know how they turnout!!!

I have been thinking about this same type of format for my room using some High excursion 8" subs from MCM.
My room is only 10.5' wide on the speaker end and leaves very little room for some panels with my current woofer system.

How wide is the ESL element?
I have learned that the wavefront starts to transition from the Figure 8 pattern into focused beams when the width of the driver equals one wavelength.
And also transitions from the figure 8 pattern to a circular omni directional pattern at lower frequency's equaling one wavelength of the width of the driver.
The Baffle does have some effect on this as well.

Great Work!!!!!


Last edited by geraldfryjr; 24th March 2013 at 01:32 PM.
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Old 24th March 2013, 03:22 PM   #6
chinsettawong is offline chinsettawong  Thailand
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Wow! They look amazing. Congratulations!

Wachara C.
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Old 25th March 2013, 07:29 AM   #7
Calvin is offline Calvin  Germany
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another fine looking Entity of Superior Electrostatic Loudspeaking

just some Q and remarks.
Are the midwoofers dipoles too or encased in a CB?
What were the reasons to xover at 600Hz, not lower?
Do You get any issues of the midwoofers blowing the membrane into the stators? If so a slot in the front panel between ESL and woofers could help.

Like the fixture of the Oak stripes with the aluminum brackets used as optical stylish element at the same.

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Old 25th March 2013, 01:21 PM   #8
jeneses is offline jeneses  United Kingdom
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I really like the combination of aluminium and wood. They look nice.
Can I ask about the woofer drivers you using?

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Old 25th March 2013, 09:01 PM   #9
bolserst is offline bolserst  United States
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Hello fperra,

Once again you are showing off your woodworking and building skills

I would second Calvin's concern about the woofers "blowing" the ESL membrane into the stators. I experienced this when building a similar project. As Calvin already mentioned, the solution is to separate the ESL and the woofer panels by a slot. You may also need to add a rearward projecting baffle on the woofer side to further isolate the ESL from the dipole woofer's air motion. If see-thru optics are not required, adding some resistive damping on the rear stator with silk screen mesh or thin felt will also help considerably with the problem of acoustic coupling with the woofer.

You don't have to get your ESL going to get a feel for the magnitude of the problem.
Just wire up your woofers and do a frequency sweep or listen to some bass heavy music and see if the diaphragm hits the stators.
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Old 25th March 2013, 11:55 PM   #10
fperra is offline fperra  United States
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Thanks for all the positive comments. Here is some more information and pictures on the build. The cone speakers are TB W5-704D of which there are 10 per speaker. They are mounted in a vented box tuned to 50 Hz, but they will be crossed over to the sub woofers at 80 Hz. The els panel is the same design as my previous build; it's dimensions are 5-1/2" x 6--1/2" with the radiating area 3-1/2" x 58-1/2". I'll be experimenting with the crossover frequency, searching for the sweet spot somewhere between 400 to 800 Hz. As before I'll be using a digital crossover unit that is a Chinese clone of the Ashly Protea 4.8SP 4x8 Processor. This unit is much quieter than the DCX2496 and easier to program.

Some more pictures:

The power supply
Click the image to open in full size.

Click the image to open in full size.

Rear grill cover for the ELS. I made it deep enough so I can experiment with damping material. Also notice the rear of the cabinet is finished with Duratex paint. I love that stuff.
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Inside view of the speaker box. 4cf. I'm wating for some parts from Parts Express to finish them off.
Click the image to open in full size.

A close up view of the book matched columns. I have a large supply of quarter sawn white oak raw lumber that I use to make Stickley style furniture. I made some 1/16" veneer from one board, so both speakers have book matched columns and the left and right speakers match each other.
Click the image to open in full size.

That's about it for now.
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