The uls is a fine sub with high sq in a small box because of Xbl^2 motor. But xbl^2 motor in general has low sensitivity compare to other topology. At 1k, it's a bargain because at retail, the driver is about 250, amp 300, box and finish 200. So a 250 mark up is not too bad. I know it cost them less but If I was to duplicate, it would cost 750 with no after sales support.