tubes and rock and roll, good fit?

Yes. Tubes to solid state, and back to tubes.

Good luck.

He just makes one of the best speakers, period. I heard the Ankaa w/ an ARC Classic 60 amp, and thought it sounded great. I can't imagine not being thrilled w/ a Rockport and a well matched tube based system. This of course for my tastes, and IMHO.

I use tube pre-amp AR LS-8 with Channel audio d 200 mono blocks on bottom (class d) and I think great combo for rock

I agree that tube pre-amp + Class D amp is a very effective way to introduce tubes into a system with speakers that are not designed to be tube friendly (low efficiency, low impedance).

The final answer is YES! A resounding, unequivocal, with out hesitation YES! This is not to diminish SS. They achieve diferant yet similar results. Though I will say the siegfrieds are not bloomy like a lot of the lower watt tube amps. They are not harsh like a lot of SS amps. They are sweet like class A rated SS amps but with more bloom. They fall somewhere between SS and tubes, leaning toward tubes. They have that punch and power at the bottom end and finesse and sweetness for the mids and upper end sounds. They reproduce rock and acoustic music with, I believe, no added house sound. Just whats on the vinyl, with all the impact that exsists between the grooves. As far as their match with my altairs, no issues at all. They are a great fit! A FINAL DESTINATION!