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Popular DIY diaphragm coatings: Licron Crystal ESD (8 oz aerosol spray can) $50 with shipping. Apply one coat "just wet" works perfectly. May not be available in some countries due to flammability / can't ship air freight. Stat Clear - water based spray bottle, non-flammable, reported to...

I would advise placing some small clamps at the edge areas in question, and then NOT holding the panel while testing it-- just lay it on the floor. If you much touch the panel while it's playing, only use one hand, so if you receive a shock, it can't travel thru your heart. The bias supply...

Another gem from Tokyo Groove: And here's one from Tokyo Groove's drummer babe:

"The previous owner said there was a short in the panels that kept popping his amp" is a red flag that shouldn't be ignored. I can envision three possibilities here: Either the previous owner's amp was flat out incapable of driving those ESL's, or there's a short in a panel, or a short in...

Geeze...after re-reading your post, it seems I was looking at the wrong connector. Now it makes sense.

Well, i retired at age 69 and I miss my co-workers but not the politics! Just curious... I'm guessing you worked in avionics?

Hey I worked in aviation too-- now retired from Gulfstream Aerospace in Savannah, GA. But I've also worked in defense aviation with Grumman, Northrop, Sikorsky, Vought. Small world!

Is that Euro-connector in the photo connecting the panel to the power supply? I use Euro-connectors in my DIY speaker builds. I suppose one could go bad but failing with only partial continuity (rather than no continuity) would be unusual. If you don't have a replacement connector you...

Not sure if everyone is aware of this so I'm mentioning it: Most dish washing liquids and even some hand soaps contain sodium laurel sulfate, which is electrically conductive. So, anyone uses dish soap to clean your panels, be sure to rinse them thoroughly to remove any soap residue which...

If you could get the manufacturer and part number of those transformers you could probably find a data sheet on the manufacturer's website. There should be a part number on the transformer somewhere.

I just looked at the Prodigy schematic that someone posted today. Some one please check behind me on this because I'm petty much a dumb-*** when it comes to figuring out electronics. If I'm interpreting the schematic correctly; I'm seeing two transformers connected in parallel, and each...

I admire anyone with the smarts to make passive setups work, as I would be so lost attempting it. As you can see from the schematic; my setup can be very simple because I don't have a passive crossover and a bunch of EQ filters between the amp and transformers-- just the two outs from the amp...

Yeah I have the mechanical stuff down pretty well after all these years... it's the electronics I struggle with.

I haven't a clue. I'm thinking they would either have to be identical transformers connected in tandem to double the voltage out (like my dual toroidal setup), or an arrangement where one transformer has a lower ratio driving the treble band and the other a higher ratio driving the mid-bass...

Does anyone know the step-up ratio of the Prodigy transformer(s)?

That's right but they're no piece of cake to build either. I always start out with noble intensions of design something easy to build but then my compulsion for aesthetics kicks in and things get complicated :-(

Honestly-- I don't know. I've built ESL's for over 15 years but every few years I've build a different panel design and given the older panels away to anyone willing to pay the shipping (I haven't kept up with those). 3M says the adhesive tapes I use on the panels will last 25 years if...

Thank, sir. But can you believe I built seven pairs of the MkIII's? I must have been insane! The last build was fours pairs at the same time, which took me almost a year-- but that healed my psychosis. I'm now officially retired from speaker building. I still keep up my website...

Here's a link to the transformers I use in my DIY speakers, which requires two per speaker in a tandem arrangement: https://www.rapidonline.com/vigortronix-vtx-146-050-106-toroidal-transformer-230v-single-primary-50va-0-6v-88-5190 But I'm pretty sure Brandon is right: The tandem toroids could...