RTR electrstatic speakers

Sean, thank you for all the research work on the RTR e-stat panels. That was the most info I’ve seen so far, the verification of 375hz crossover point was an import piece of the puzzle. I had been swapping speakers in and out of my system with known specifications trying to get a handle on where the RTR’s were in comparison.
Keeping the crossover point between the panels and the dynamic drivers lower has raised some very good questions. Hopefully some of it can be sorted out before they are fired up, but as you suggested the rest can be dialed in with the crossover.
As far as the over all design, I didn’t start out building line array speakers, talking with Albert Porter started all that. He also suggested talking with Danny at GR Research (gr-research.com), who provided some very useful information.
I had drawn up speaker plans before talking to Albert and Danny, but decided to learn more about line array speakers before going any farther. It was becoming apparent that the RTR panels would excel in this configuration if certain obstacles could be overcome.
Someone had suggested James Griffin’s paper, which is a “must read” if you are going to build anything close to a Near Field Line Array speaker. Finding out that by placing drivers within the sound radiation pattern of another driver increases the overall sound pressure level (SPL) is where I decided to take Albert’s suggestion and post on Audiogon. The efficiency of the RTR panel became a major issue when it was learned that the SPL of the dynamic drivers would rise from the mid 80’s to the mid 90’s.
As for the speaker box, the dynamic drivers will go in a sealed box. The drivers could have gone lower in a ported box, but a sub will be used below 120hz. It would have been fun to figure out a good way to “free air” the drivers to match RTR’s dispersion, but for now it looks like a sealed box for the drivers and free air for the RTR panels. Building another box later to experiment with is a possibility.
Sean the info you provided answered a lot of important questions. It was funny to see that you suggested Griffin’s publishing’s on the Linus Array; it’s kind of the foundation that this project is now based on. Thanks for the help, Brian

I, too have Crown electrostats several sets of 224's and 212's. Can't really tell if RTR or Crown mfr since RTR made them for Crown. Could be either. Any info would be of interest, including anybody who has some good ones and wants to sell. I will be interested in conversing with anyone.

In the mid 70's I was stationed in San Diego CA and had previously purchased the RTR 400's while in Bremerton WA.  I also purchased the ESR-6 Tweeter Box to sit atop them. At some point they developed a problem and since Canoga Park was a reasonably short drive I took them there for warranty repair.  These folks were most helpful.  While I was waiting a very nice fellow named Joe Alinsky took me for a tour.  During that time there he sold me a pair of blem 400's to take home.  At that point I began to build the system I currently have.  It consists of the ESR-6 box, 8 D150 mid range panels in their own cabinet and I had a cabinet shop in San Diego construct me two woofer cabinets out of 1 1/4 MDF dense particle board each one at roughly 8 cu/ft.  The woofer cabinets are internally separated as was advised by the folks at RTR.  The problem was this setup proved too much for any one amp - at least one I could afford at the time - to drive this system.  Yes, the AR D-150 did a fine job but was out of my reach.  The solution was to use the AR EC-2 crossed at 400 Hz  a Phase Linear 400 for the lower end and a Crown D-150 for the upper.  The Crown was eventually replaced with a Threshold 400a.  As each person has different taste - and hearing - aside from the Infinity Server Static 1A's I've never thought to part with what I have.  Now that I'm OLD and realizing that when I go my son will put all this in the dumpster,  I've thought to sell it off.  Sadly, eBay seems a poor platform to use as there is no shipping possibilities - each woofer cabinet is over 200 lbs.  Any suggestions - or offers- would be greatly appreciated!  If you've read this far I thank you!