the smoothest sounding speaker

The various Spendors have an excellent reputation for accurate reproduction with good imaging but non-fatiguing sound.

Spendors are definitely somewhat colored but in a very musical way. They are still well made in Britain transducers and forgiving of less than optimal equipment.

spendor, harbeth, proac, neat, castle, rogers.....

1. All speakers are not flat in room.
2. Most CD players "give you ear fatigue playing CD's".
3. High resolution makes matters worse, not better

Q. What to do?
A. Alter the response curve in your room to provide smooth coherent sound at the listening position.
Q. How?
A. Use digital room correction. A used Tact a generation back (say a 2.0) can be had for a little over a thousand bucks. Get the model that accepts analog inputs (designated aaa).
cheers