Musical subwoofer for under 1K

For brand new under $1K (list price) there is Monitor Audio ASW210 ($999) and ASW110 ($699). Also REL Q100E ($999).
There are usually some new/refurbished Monitor Audio Subs on eBay that go for around $650(210) and $450(110) with warranty.
For used under $1k look for a used REL Stratus or Vandersteen 2W.

I forgot the HSU Research VTF-2 only $499 new. Someone at Stereophile like it. If you can use an amp you current own to power a sub, the HSU TN1220 ($499) or TN1225 ($359) are great subs. The separate matching amp is an additional $699.

i'd suggest getting a pair, if mainly for music - *every* aspect of subwoofing improves, & *every* possible negative re: integrating w/your main speakers is minimized, when using *two* subs, imho...

i'd suggest, based upon your room size, a pair of vmps original subs, a marchand deluxe xm-9 x-over, and the best used solid-state amp ewe can find/afford. while the cost will exceed $1k, it should still be under $1500, & it will be *really* something! :>)

regards, doug