We had a Fulton dealer in San Diego who was devoted to J Gordon Holt's reviews in Sterephile. So when Gordon praised Fulton speakers they began featuring a J system. Everything Fulton added, from the Gold speaker wire to the preamp were added to the demo system. It truly was musical.
There should be a number of RTR panels still around, even if requiring some effort to locate. In addition to those already mentioned, they were used in both a 6 and 12 panel add on tweeter box. There were sold by themselves and as an upper portion of a RTR floor standing model. Infinity used them in a couple of models before developing their own EMIT units. There may have been others, I don't recall.