Steve, there is a Martin Logan Descent active servo-controlled sub fs on the ’Gon at the moment within your price range. You could also pickup a 2nd hand JL Audio Fathom F110 sub within your budget, or stretch a bit for a 2nd hand F113 which average around $2k. Qualitatively the F113 would be on another level compared to the above ML sub & was a Stereophile Class A recommended component way back when I believe.
