I’ve had a bunch of the heritage line over the years. Too much damping factor will make them a little strident or stiff sounding. But not necessarily bad sound just not the typical smooth sound most people turn to for them. Most like a tube amp because of the inherent brightness of most of the heritage series, the new ones are not nearly as bright as the older ones though. I’ve heard big power Mac amps on them (not ideal), low powered SET’s on them and after many different amps a low powered one always sounds best. I would look for a nice 20-50wpc SS class A amp or Tube amp. The best I’ve heard was Triode labs 2A3 SET’s but they are not cheep, and only 2.5 wpc. But I have also heard a Luxman 20wpc class A amp that was fantastic as well. Class A-A/B won’t make that much difference with them, but IMO lower powered Tube or SS always seem to sound the best. Big power doesn’t seem to respond well with them IMO.
If I had another set of LaScala’s I’d probably use a vintage Sansui 777A (or similar, and after a restoration) on them those capacitor coupled amps sound sweet on the heritage line similar to a tube amps sound without the tubes.

