What a great forum where experts are always willing to share their knowledge, and help a total stranger! Thank you very kindly guys!

My room is about the same size as yours and I have the X-5, though I would not mind more bass, so if the X-3 is in your budget I would go for it as you can adjust the bass easily if you find it is too much, just turn the amp down.
Yes, the X3's are within my budget (and in this case I will have dual subs integrated perfectly into my setup), but I still do not understand (sorry guys...) how I can adjust the amp output. Is it equipped with a dial or a switch or what...
Or get the X-5 and subs. Clayton is working on a new sub now and you can always evaluate the bass first and add a sub later.
What is required in order to integrate dual subs into my setup, please? As I mentioned earlier, all I have to work with is an entry-level PASS Labs XP-12 preamp (
https://www.passlabs.com/products/xp-12/)...
Any info, even preliminary, on the new sub from Clayton you could please share with the community? Specs, price, availability timeframe, anything...
I can remotely mute the subs and compare to X-5 alone. Not really a big difference - more really deep bass (when it's there) but on most rock music not much difference.
Glynn, any chance you could please check your setup with classical symphonies, grand piano (my "litmus paper" for music reproduction) or opera? Would you say the X5's alone are up to the task?
visually, I prefer the X-5 to the X-3.
Aesthetically, I would much prefer the X2's... The problem is I was unable to find any specs: looks like they are out of production, unfortunately. I wonder if it is true the 15″ driver used in the X2's indeed reaches down to 18Hz... Any experts in the community who could please shade some light here? At about 10K the X2's are quite expensive for me, but if they really SOUND right, I would have considered them... Out of luck with the X2's, sadly...
I’m doing the same thing Glynn. The difference between the subs vs the internal sub in my space is more notable on movies with deep bass and when I crank up the music.
At my listening position I seldom exceed 90 dB SPL (not sure about the peak levels...) almost never "cranking up" the volume (live in a small condo), but when the music material demands for the bass output (pipe organ, e.g.), I would like to be able to reproduce if faithfully. Any chance you could please perform the test I asked Glynn about and report back? What sub(s) are you using?
This is the same for me, X5's here, plus the X5 baffle is 3 inches narrower, good for OB. In my 17x19x8 room I find no need for subs...
Tom, could you please elaborate a bit why it is better for OB to have a narrower baffle? This actually can be the deciding factor in my dilemma. And another important observation: your room is even bigger than mine, and you do not have the need for subs. May I please inquire if it will be possible for you to conduct "my music test" and get back with the results?
The X3 and X5 have the same bass extension on paper, -3db @25hz...
It is posted on the website "Frequency Range: 25Hz-22kHz (typical in-room bandwidth) +/- 3dB". Could somebody please explain what exactly the ''typical in-room bandwidth" term means? What is the correlation with anechoic chamber measurements? Would it correspond to, let say, 35Hz at -3dB anechoic? As you can tell, I am not Guru, and do need your help badly indeed, dear experts.
97dB sensitivity is really high, should I worry about hearing any system noise at such a high level?
Could somebody please check if it is an issue indeed?