Musical subwoofer under $2000

I am critical of subwoofers and most recently  owned two REL T9i units. 

The RELs sounded excellent but had a couple flaws that made me sell them. The level control was too coarse for properly matching with my main speakers- one click position and the sub overpowered the main speakers and on the lower click the output dropped too low for some reason.  

They did not extend at the sub bass frequencies which is something I prefer- a strong output at 20Hz. 

My new subs are the SVS SB 2000 Pro.  They have excellent output and 20 Hz and give that deep bass sound and feel.  The App control is very fine- level setting and matching is easy.  The DSP is also useful, I used it to tame a few high peaks on the left subwoofer to smooth the response. 

If you have room, the SVS SB3000 is super impressive and has a bit better tone than the SB 2000 Pro.  The SB 3000s were too large for my space.  

I would highly recommend going the two sub route.  You have a decently large space to fill that will surely have peaks and nodes.  With subs 1+1=3!  You have a great system and some good subs will really enhance your listening experience.  Good luck and cheers. 

If you get two subs, you can also try each as L/R mono ( = stereo subs), and you can conversely stack them vertically and run each in stereo (L + R channel signals) to see if an “array” approach improves their “collective” directivity. Stacking may be more difficult with the model (Gallo TR3-D) I recommended vs. the others, but the benefits might (MIGHT) remain the same 😉

Thanks again for all the advice. Right now I'm considering the Rythmik F12 XLR3 gloss white with A370XLR3 amp  or the Arendal 1723 SUBWOOFER 1S in satin white - with the option to go to two later, if needed. I must also admit I'm tempted by the Arendal 1723 SUBWOOFER 2S at $2,500 as a one and done solution.

Like many I was leaning to REL (but only because there is so much hype around them) but from a value for money perspective their prices have leaped enormously in the past 2 years and made them much less attractive from a value perspective.

By the way I saw another thread yesterday on DAC's https://forum.audiogon.com/discussions/dac-recommendations-please-2
and was fascinated by the BARD AI review from @ghdprentice  AI since its trained on existing data is highly susceptible to information bias too, but nonetheless maybe something Audiogon should be looking at and using members feedback?

Highly recommend the Arendal sub.

I use the smaller 1961 1s in my bedroom setup (mostly used for home theater) and found the controls (e.g. variable phase, selection of roll off slopes) very useful and it was surprisingly easy to integrate with the Magnepan LRS+.