Non fatigueing speaker under 1500

Soliloquy 5.3 Used or b-stock. Do a search for the various
reviews.
Sheldon

Spendor's new S6 is my vote.

Of your choices the Vandersteens are very good indeed. If after you purchase them, there is any residual hardness, look elsewhere in your setup! ( like Spendors also.)

I'd suggest a used pair of original Quad ESL's (the "57's") as among the most non-fatiguing speakers at any price, and if not Quads then Maggies.

Boxiness is a subtle but persistent source of listening fatigue, and it's fairly expensive to build boxes that don't sound like boxes. So in your price range, if non-fatiguing is the primary criteria, I enthusiastically recommend dipoles such as the Quads or Maggies.

The Maggies are more much forgiving of listening position, while the Quads are a bit more forgiving of speaker position. The Quads like low-power (usually tubes), and the Maggies like fairly high power. The Maggies don't really come to life at low volume levels like the Quads do.

On the other hand, if you gotta have boxes, the Vandies would be a good choice.

I agree with the many who have already stated the Vandersteen is a great choice. I am of the opinion that it is the best value in a full range speaker. It is a steal at its price point.

The Magnepan 1.6QR is a great speaker as well, but it presents many potential problems. It requires quite a bit of current as is extremely sensitive to placement. In the right situation it could outperform the Vandersteen 2CE Signature. I would say that 90 percent of the time the Vandersteen will be the better choice because the speaker is not at all picky about what is being used to drive it and it is not anywhere near as placement sensitive as the Magnepan is.

Good Luck.