Speakers to pair with the Ars Sonum Filarmonia tube amp?

Devore might be another good choice, although I agree Reference 3A is one of the first I thought of. Totem is another. Cheers,
Spencer

Here's another couple to look at.
http://www.fritzspeakers.com/sound.asp
http://tyleracoustics.com/pro_dynamics.html (Model PD10 or PD15)

Need to look at impedance curves to insure no dips in impedance below what the manual states / warns (4.3 Ohms ?) 

https://totemacoustic.com/en/forest/specifications

https://www.audiogon.com/listings/full-range-totem-acoustics-forest-like-new-2017-03-05-speakers-068...

https://www.audiogon.com/listings/full-range-totem-acoustics-forest-the-best-deal-on-the-site-just-s...

You may want to ask around, but I am thinking your 30 watts will drive these just fine. Min impedance is 6.5 Ohms, Nominal is 8 Ohms

Currently I'm using Merlin TSM mmi speakers -- the model preceding the Black Magic edition. I could update the Merlins (~$1k) or switch to entirely new speakers. Silky, non-fatiguing top end is mandatory.

That’s a lot of $$ for the upgrade.
If I were in your shoes I think I would be looking for a different speaker also. I think the Reference 3A Mm DeCapo or Reflector would be a great choice., but thats my opinion. Also pretty versatile speakers. Will work with everything from 300B SET to Nelson Pass First Watt F6 or F7.

I upgraded preamp and drive tubes and fuses in my Ars Sonus Filarmonia, made quite an improvement. I am thinking down the road I may get the new Sophia Electric EL34 tubes. Also I may have the coupling caps changed out for a V-cap or similar.

If time permits let me know what you finally settle on. I would be interested in your personal experiences with the Fila.