Hintel hing, If u can pay $6.X, I thank u can consider sencod hand SVS sb12+ at Review33 (may be lower). I have test velodyne cht-10r but no good, min. spl 1000 is Ok (about $9.X). So SVS is good for u at this price ring, SB12+ $7.x (new) it can win $10k subwoofer in my personal.