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 😆

Easy. Get two 12" Dayton Sub kits from Parts Express with Class D plate amps and a MiniDSP crossover. The kits are easy to build. You can paint them or cover them in equipment carpet. 

@soix +1

Plus with the SVS you have the phone app and can really dial things in for your room, and your liking. 

Rythmik

I just purchased a pair of REL T/5x subs, they are fantastic. I have a small listening space so the T7 or T9 would likely be a better match for you. The T7 is within your price range the T9 is about $1000 over (for a pair). The Neutrik Speakon connector makes it simple to connect and integrate. The integration is old school though as there is no app or DSP. I like the old school though and I found it easy enough to get them set up, a bit of tweak, take a seat and listen, get up and tweak and repeat. They are very musical subs, with a sealed enclosure so no boominess.