Musical subwoofer under $2000

I use a stereo pair of Gallo Acoustic TR3-D subs, have for years.
Right in your price range, too.

For my setup to be of correct frequency : driver surface area balance, I should have 3 subs per channel (long tall story, literally), but one sub per channel is enough for me.

I haven’t heard a more worthy sub for music in its price range.*

I can anecdotally attest that lifted 45cm clear of the floor, speed and clarity even without DSP has visitors taken aback with bass from my setup. Most of them own or have listened to setups many times the value of mine (admittedly, mine’s not inexpensive).

My only disclosure is that my room is large, but solid concrete, all sides including ceiling; room gain is on the sub’s “side” in my use case. I can’t vouch for drywall applications, but perhaps others can.

*denotes 100% factual comment conveying pure opinion 😆

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 😉