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

@ronboco  I have a friend that is in a firm here in the North Texas area that does primarily large corporate projects.  He is giving me his inputs on diffusion/absorbtion/placement, but I want to finalize my speaker selection before I do a final design with measured performance.  

  I have exchanged a few emails with Jeff and know of his reputation among forum members here and in other forums.  I still might engage him once I take possession of my dream speaker.  I am having some scatter plates CNC’d to use on my DIY acoustic panels.  My interior designer (wife) selected the coordinating color/fabric for the Guilford fabric I am using.

  You obviously did a complete from scratch design and that is quite impressive to say the least.  I should have requested input before I started this build, but I think I can live with the bones of this room as it is built much more solidly than a typical room structure.  

@mckinneymike 

It sounds like you are thinking everything through very well. I’m sure your room will sound amazing once you get it all done and don’t forget to share some great pics of it! 
 

Regards 

Ron 

@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.