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

@mckinneymike 

Pressurizing the room is about moving air - so high db and low hz help a lot.  Bass moves more air than midrange.  As @soix already said, you get down to 25 hz with -3db.  Not bad...  20 hz with -3db would be better, but, you can do well with 25 hz...   Play with speaker positioning as much as you can to increase the bass without it getting flabby, ie. the closer to the front wall, the more bass, but, it can get boomy/flabby.   Then, there is room treatments to play with.  I also have a big room with high cathedral ceilings and I managed to get great bass out of my tower speakers by good positioning (note: mine go down to 20 hz).  My area is a living room and bar with lots of objects in it and pictures on the wall...  This can also help with the boominess. 

Note: Looking at the Stereophile review of your speakers, it seems they dip down to 2.3 ohms or so at 22 hz...  If you have an amp that almost doubles down in power as the speaker ohms halve, you may get more bass out of those speakers.  Here is a quote from the Stereophile speaker review that may help your cause: "The coincidence of the port tuning and the lowest-frequency mode in my room boosts the Rockports' output in the octave between 18 and 36Hz, a region where the sealed-enclosure Magicos were more neutrally balanced."

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.

@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 .