Are you looking for used or new? The TAD 150 Signature is worth considering, and can be found used for <$1000. But I think they are only available used.
TAD (Tube Audio Design) also sells a sub ($289) but I'm not familiar with it. I like Rel Subs - and you can find Rel Storm III for ~$1000 used, and Rel Strata III can be found used for ~$750 used I think . New Rel subs are somewhat more than $1000, though there may be an entry model below $1000.
TAD (Tube Audio Design) also sells a sub ($289) but I'm not familiar with it. I like Rel Subs - and you can find Rel Storm III for ~$1000 used, and Rel Strata III can be found used for ~$750 used I think . New Rel subs are somewhat more than $1000, though there may be an entry model below $1000.