ATC SCM 50 is a classic that has withstood the test of time but it won't win a beauty contest and it is not rare - it will hold it's used value well (assuming you get a good "demo' or used price).
The other two speakers are more elegant and are likely to remain rare - so perhaps more pride of ownership in terms of possessing a unique speaker. Will they withstand the test of time - who knows - very little does in audio.
Since I have not heard the Linn or the Pass Labs, I cannot comment on the sound quality. I have no doubt that they are extremely good.
The other two speakers are more elegant and are likely to remain rare - so perhaps more pride of ownership in terms of possessing a unique speaker. Will they withstand the test of time - who knows - very little does in audio.
Since I have not heard the Linn or the Pass Labs, I cannot comment on the sound quality. I have no doubt that they are extremely good.