Author Topic: Yet another ESL project  (Read 2544 times)

Offline jazzman53

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Yet another ESL project
« on: February 26, 2016, 06:31:18 PM »
The insanity continues... more to come:


Carver C1 preamp
Logitech Transporter
Carver CTL100 CDP 
Carver TX-11A tuner
Carver TFM-25 amps (4)
Behringer DEQ 2496 EQ
Behringer DCX 2496 crossover
DIY Hybrid Electrostatic speakers
DIY Ripole Subs
DIY cables

Offline Kingman

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Re: Yet another ESL project
« Reply #1 on: February 26, 2016, 07:18:06 PM »
WOW!!!! Looking good Charlie! An updated electrostatic panel.  Details????
IN REALITY IT ONLY MATTERS WHAT IT SOUNDS LIKE TO YOU!!!!!

Offline jazzman53

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Re: Yet another ESL project
« Reply #2 on: February 27, 2016, 08:19:54 AM »
This project is a segmented wire-stator type electrostatic speaker. 

The photo shows my stretching jig and stator wires being stretched about 1%.   Stretching the copper wires to plastic deformation renders them perfectly straight and also work hardens the metal such that the wires remain straight when the tension is relaxed. 

The stator wires will be supported in the speaker by an wooden lattice frame that will look somewhat like a ladder; consisting of side rails, two center rails and eighteen horizontal rung supports.

There are 90 wires total, which will be segmented into (15) 6-wire groups.  The center wire group will be directly coupled to the amplifier/step-up transformers; receiving the full frequency band above 200 Hz.  From the center outward, the paired wire groups to the left and right of center will receive progressively less treble.  This is accomplished by inserting resistors between the segments, which then couples with the wires' capacitance to form a first order filter that attenuates the treble downward and imparts a small phase shift that bends the wavefront into a cylindrical shape. 

The effect is that the flat panel electrostat now projects a cylindrical rather than planar wavefront; giving wide dispersion.   The polar response will be far superior to a curved panel (like ML) and even better than most conventional speakers, while still retaining the  magical ESL sound.               
Carver C1 preamp
Logitech Transporter
Carver CTL100 CDP 
Carver TX-11A tuner
Carver TFM-25 amps (4)
Behringer DEQ 2496 EQ
Behringer DCX 2496 crossover
DIY Hybrid Electrostatic speakers
DIY Ripole Subs
DIY cables

Offline jazzman53

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Re: Yet another ESL project
« Reply #3 on: February 27, 2016, 08:29:03 AM »
BTW, I'm not smart enough to figure any of this out... but I have smart friends over at the DIY Audio Forum who provided me with an Excel spreadsheet calculator that does all the math. 

I just plug in the height & width of the panel, diaphragm-to-stator spacing, number of wire groups, and the low end cutoff frequency (where the woofer takes over) and the spreadsheet calculates the resistor values, max SPL, and frequency response curve.  Pretty cool! 
Carver C1 preamp
Logitech Transporter
Carver CTL100 CDP 
Carver TX-11A tuner
Carver TFM-25 amps (4)
Behringer DEQ 2496 EQ
Behringer DCX 2496 crossover
DIY Hybrid Electrostatic speakers
DIY Ripole Subs
DIY cables

Offline MacGeek

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Re: Yet another ESL project
« Reply #4 on: February 27, 2016, 11:01:48 AM »
Very nice.  I wish you lived near Pittsburgh so some of us could hear them.
MAC C-46 pre, MQ 108 eq, MC 352 amps (2), MR 78 tuner, MCD 500 CD, MPI-4 scope, LS 352 speakers, Sony HDR-F1HD AM/FM/HD tuner, Denon DRS 810 cassette, Denon CDR-W1500 CD recorder, Music Hall MMF-9 w/B&O MMC2, Revox A-77 R to R.

Offline RuralTom

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Re: Yet another ESL project
« Reply #5 on: February 27, 2016, 04:03:51 PM »
Very nice.  I wish you lived near Pittsburgh so some of us could hear them.

Agreed!
pre :  Melos GK1, Usher P-303
DAC: M2Tech Young
amp: VTL Compact 80, Onkyo M-504
CDP:  Onkyo DX-706
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Offline schwarcw

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Re: Yet another ESL project
« Reply #6 on: February 27, 2016, 06:02:29 PM »
We have a new Sparky!!!  (long story  O0)
Carl

Offline jazzman53

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Re: Yet another ESL project
« Reply #7 on: March 09, 2016, 10:01:54 PM »
Update 3/9/16:

Most of the wooden pieces for the wire support lattices are cut. A few minutes ago I dry fitted the interlocking pieces for one of them (see below).

I plan to spray apply a coat of a light stain and a coat of satin polyurethane (while assembled, not glued). And then re-assemble and glue the pieces together, over the wires, in the stretcher jig.

The stators must fit within the frame of my existing beam splitter speakers and they had to be rather thin to clear the beam splitter during install.

It's a lot of work but I think they will look much better than my current welding rod panels.



Carver C1 preamp
Logitech Transporter
Carver CTL100 CDP 
Carver TX-11A tuner
Carver TFM-25 amps (4)
Behringer DEQ 2496 EQ
Behringer DCX 2496 crossover
DIY Hybrid Electrostatic speakers
DIY Ripole Subs
DIY cables

Offline Sir Thrift-a-Lot

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Re: Yet another ESL project
« Reply #8 on: March 10, 2016, 12:12:19 AM »
That's dedication.

Offline jazzman53

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Re: Yet another ESL project
« Reply #9 on: March 10, 2016, 06:06:29 AM »
Carver C1 preamp
Logitech Transporter
Carver CTL100 CDP 
Carver TX-11A tuner
Carver TFM-25 amps (4)
Behringer DEQ 2496 EQ
Behringer DCX 2496 crossover
DIY Hybrid Electrostatic speakers
DIY Ripole Subs
DIY cables

Offline MacGeek

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Re: Yet another ESL project
« Reply #10 on: March 10, 2016, 07:05:31 AM »
Excellent work (and patience) nevertheless
MAC C-46 pre, MQ 108 eq, MC 352 amps (2), MR 78 tuner, MCD 500 CD, MPI-4 scope, LS 352 speakers, Sony HDR-F1HD AM/FM/HD tuner, Denon DRS 810 cassette, Denon CDR-W1500 CD recorder, Music Hall MMF-9 w/B&O MMC2, Revox A-77 R to R.

Offline Sir Thrift-a-Lot

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Re: Yet another ESL project
« Reply #11 on: March 10, 2016, 09:46:37 AM »

Offline jazzman53

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Re: Yet another ESL project
« Reply #12 on: March 18, 2016, 09:05:26 PM »
Moving right along...



Carver C1 preamp
Logitech Transporter
Carver CTL100 CDP 
Carver TX-11A tuner
Carver TFM-25 amps (4)
Behringer DEQ 2496 EQ
Behringer DCX 2496 crossover
DIY Hybrid Electrostatic speakers
DIY Ripole Subs
DIY cables

Offline Jim Pittsburgh

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Re: Yet another ESL project
« Reply #13 on: March 19, 2016, 09:23:39 AM »
what a great job.... congrats man.  Now we just need you to bring them to the 'Burgh" for a listen!
Clearaudio Performance SEP/Talisman V2 gold,PL XP-15, Onkyo Integra DSP 8.3, Marantz SR6005, KEF Reference 5, KEF Reference 4C,KEF Q900, , Q800, HSU VFT-15H,Emptek DSA250,Krell S1500 #2 Marantz SR6007,  McIntosh1501, KEF Q600, Sunfire NHTsuper1s, Technics 1200 MkII/ Shure V15 xMR, dbx DX5 ,Jolida JD

Offline jazzman53

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Re: Yet another ESL project
« Reply #14 on: March 24, 2016, 08:14:41 PM »
Update 3/24/16:

The stators are finished and the diaphragms were installed and conductive coatings applied this afternoon. The coatings need twenty four hours to dry and then I can assemble the panels. The resistors and bread boards for the RC networks were ordered today--- still gotta build the networks. I figure another week to wrap this up.


Below: Bonding stator to the tensioned diaphragm, on a pneumatic (bike tube) tensioning jig.  Diaphragms were tensioned to 1.4% elongation.


Below: Diaphragm installed

Carver C1 preamp
Logitech Transporter
Carver CTL100 CDP 
Carver TX-11A tuner
Carver TFM-25 amps (4)
Behringer DEQ 2496 EQ
Behringer DCX 2496 crossover
DIY Hybrid Electrostatic speakers
DIY Ripole Subs
DIY cables

 

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