the smoothest sounding speaker

Ohm Walshes. Utterly non-fatuiging, with great transparency, imaging, and sounstaging. A no brainer.

Focal 1037 BE. (aka JM Labs) When combined with Virtual Dyanmic cables they are very detail but non fatigue. I have the 1037 with the beryllium tweeters and VD cables (all round), i can listen hours and hours without any fatiguing at all. The

I will caste in a reference to the ACI Sapphire XL, a speaker that is very similar to Aerial Acoustic's in the top end. They are certainly the type of speakers you can listen to for hours on hours, even on transparent transistor amplifiers.

my latest speaker is the smoothest i have heard while still have the extreme detail and emotion. Avantgarde uno, previously i had martin logan and before that acoustats and they were smooth and detailed until i hear the uno's. what is also interesting is that i had various brand silver cables and they all make the systems sound bright, changed the entire system to paul spletz anti cable and the detail, smoothness and bass and high all sounded better. hope that helps.

Ultra smooth. This has held true for both the 5.0s and 6.2s I have owned.

Mating with tubes is almost too much imo.