This has been a very good thread.
If I can contribute the opinion of a 78 year old who has been an audio enthusiast ever since my parents let me touch their Magnavox "hi-fi" (mono - in the middle 1950s) and who has spent several hours on a bandstand and in an orchestra pit (so I know what acoustic instruments sound in their normal enviironment) - here goes.
I believe I have my "forever" speakers. I first heard KLH Model Nine electrostatics about 1968. The shop had a pair of model nines playing a tape of a jazz quintet at a supper club. The tape was on a high end deck (Grundig???). What stood out to me was through the Model Nines I could hear the customers' silverware hitting their plates. In my teens I thought I wanted to be a jazz musician, but found out rather quickly I needed a "day job" if I wanted to eat.
But in the few gigs I tried, I remember that sound of silverware on plates. I have never hear that level of clarity and definition in any other speaker.
I took several years, but I finally bought a pair of Model Nines on line. I had them about five years at my office before I quit going to the office (but my son still does not think I have retired - he still calls a couple of times a week to say "dad, how do we do this" - apparently he thinks in 50+ years in the CPA business I may have learned something).
I now in an independent living retirement center. I brought the Model Nines from the office to my apartments. About a year ago I was running them with McIntosh MC2500s in mono mode (1,000 wpc) and blew out some of the bass panels. I sent them to David Janszen (son of the designer of the Model Nines) and had them totally re-done.
Yes, the Model Nines do not generate 100 db, and the bass rolls off under about 30hz, but the definition and clarity are beyond any other speaker I have heard. I can tell the difference between a soprano sax, an alto sax, a tenor sax, and a baritone sax. I can tell the difference between a violin and a viola, between a grand piano and an upright piano, between a "stand up" acoustic bass and an electric bass.
I prize that level of definition and clarity. My music taste runs to classical and jazz (on acoustic instruments). I can really appreciate the instrumentation and arrangements of the score.
At the office I also had Velodyne F1200 subs. I may bring them to the house to pick up the bottom half dozen notes that roll off on the Model Nines. I am now running McIntosh MC2255s - and they sound fine through the Model Nines.
I have heard about some who have double or triple pairs of Model Nines (to move enough air to get good bass). But my living room now is 12' x14' and one pair of Model Nines is all I have room for.
I am in audio nirvana.
Thanks,
Jim