Lack in harmonic richness

Maybe the amp Ive heard Labs A-1 sound full. If you do change speakers go med to hi-eff in design and use a tube amp preferably a SET. A SET HI-EFF system is very full sounding, near real.

As far as I can recall I had this problem also with the previous speakers (Dunlavy SC V's) but with the Soundlabs it is aggravated.

Welcome to accuracy. Both the speakers you mention are highly respected for timbral accuracy - especially in the all important midrange. Both will have a tight lean low end (DAl's were over damped if I recall and some could even do a respectable job on a square wave - something few modern "impressive but one note bass" speakers can do!!)

If you are finding this sounds "thin and threadbare" then you clearly used to and obviously prefer a more colored presentation with some harmonic warmth. You may need a tube power amplifier on the warm side of neutral. A subwoofer may also do the trick as panels can be lacking in that bottom octave area and that can contribute to a thin sound.

Alternatively - give it some time - listen to your collection and concentrate on how different each recording sounds - the analytical precision may grow on you after a few hundred hours once you realize you can hear more detail when it is not overly warm with harmonics...I know it did for me.

These speakers were a long time favorite of Gordon Holt - so if you can be prepared to accept that your initial dislike is due to your not being accustomed to the taste of such ruthless timbral accuracy then I think this could grow on you...

Enjoy! You have awesome gear - I would not be so quick to change - or to dumb it down with warmth - just give it time.

Two cents...as usual.

BTW - in the above I assume everything is working properly. Given your extensive experience Chris - I simply assume that you would know if something was wrong and producing distortion.