"quick impressions reveal that the tonal balance of the speaker shifts noticeably with my Prima Lunas "
That is what I would expect with most tube amps given the variable impedance of the Ohms at various frequencies as I understand it.
The CLass D Bel Canto amps would do very well in terms of maintaining proper tonal balance in the low end I believe.
My belief is that somewhat higher damping factors (>10 say) also benefit and I did look for that also when choosing an amp.
That is what I would expect with most tube amps given the variable impedance of the Ohms at various frequencies as I understand it.
The CLass D Bel Canto amps would do very well in terms of maintaining proper tonal balance in the low end I believe.
My belief is that somewhat higher damping factors (>10 say) also benefit and I did look for that also when choosing an amp.