Hello, As some might remember I purchaseD a HPS1000 about 8 months ago at a really nice price. I've been extremely happy with this subwoofer. I really find little fault with it, other then it being able to truly dip to the low 23-16hz range without some heavy drop off. I am curious, with any users who have replaced the main driver on this unit. I am wondering how much problems you might of had, and what where your results? Do you happen to know what OHM the main driver runs at? Also, as I understand the HPS1000 is tuned although there is no ports on this unit perhaps someone can explain. I have found what I believe is an excellent replacement: http://www.crutchfield.com/S-1XV5K6I...PWE354&g=67800 Curious on anyones thoughts, do you feel the sound will be improved or no change, or even worse with a driver that wasn't designed for this system. Thank You!