Hi Everyone. I am looking at adding a 10" subwoofer to my stereo system in my 2012 Mitsubishi Lancer. I am running the JL Audio XD700.5 and the Hertz HSK165XL comps in the front and the Hertz ECX165's in the rear doors. I am now believing that a nice sub is needed to bring out the speakers. I am drawn between the "Sundown Audio SA-10 or the SD-2 10 series subs or the Digital designs DD1010 sub. I have heard great thing about both companies and subs but still would like to have some good feedback from you pros out there that are familiar with the products. Thank you very much for all of your help here and "Merry Christmas".