They sound like the speakers that were designed by Bill Gross, a CalTech grad and former part owner of an audio/video store in Pasadena, CA called GNP Audio Video (still in existence, I think). Their top of the line speakers featured a cylindrical, lead damped midrange enclosure and separate enclosures for the other drivers as well.
GNP Loudspeakers, anyone familiar with them?
I have a pair of GNP speakers but I can't find any info about them. They have three separate cabinets for the woofers, midrange and tweeter with an adjustment on the back of the tweeter for the mid and HF levels. The cabinets are connected with heavy duty gold spade end cables.
Dennis
Dennis