Rockport Avior II's in 19x24.5 room?

@mckinneymike 

I really want to use tube amplifiers for this system.  I have my older Krell FPB-400cx that was fully recapped at Krell in 2022, but tubes make the type of musical reproduction that I crave.  

The low impedance at low frequencies is concerning in this case.  I will need to give this choice a bit more thought than I expected.

I am sure that Krell will rock those speakers.  That is a superb powerful amp. 

Note:  Regarding Tubes, my speakers have a similar impedance curve as yours (Wilson Watt Puppy 8).  They also dip down to almost 2 ohm and are 91db sensitivity at 4 ohm.  I am using two McIntosh Mc275 tube amps in monoblock configuration to power them in my huge room. One tube amp per speaker.  So, about 180 tube watts per channel (note: Mc275 is rated at 75 watts per channel, but, tests at 90 watts per channel).  I get plenty of headroom.  For my huge room, even during parties, this is plenty of power and I get lots of bass.  I never feel a need for a subwoofer, and I listen to lots of Rock.  I hope this helps your analysis.

Twitteringmachine  April 23  2026   Michael Lavorgna

About adding  Super Tweeter  from Fyne Speakers

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I spent time over the course of a few weeks listening to both super tweeters moving from one to the other and once I settled on my favorite settings for each I let the music take where it or I wanted to go. And every time I removed them, running the F502S in stock form, my excitement level decreased. I missed the additional sense of air, resolution and refinement.

Bass heavy music also saw improvements down low with a sense of greater bass definition and clarity that seemed to affect music’s overall presentation. While the differences between the S-Trax and SuperTrax were subtle at best, as odd as it may seem the SuperTrax seemed to offer greater impact in the lower registers as compared to the S-Trax. ´´

https://twitteringmachines.com/review-fyne-s-trax-and-supertrax-super-tweeters-with-the-fyne-f502s-loudspeakers/

The 300 b tube softens the signal especially on the leading edge in the treble 

I have had custom ones made by Radu Tarta , for rock not recommended 

for jazz ,voices yes. Zesto makes a very nice preamp for much less $$ .and uses 4 -9 pins type tubes 

and solid state many good ones Aesthetix Saturn is very good and uses smaller 4 9 pin type tubes .