Hi I just installed a Hifonics Zeus ZX6400 with a pair of Focal 165V2 Polyglass Component and a pair of Focal Polyglass 690CV 6"x9" with the factory HU, the guy at the Shop recommend me to add a Sub maybe a 10" with a sealed enclosure. I want the setup to be a SQ one!!! I was looking at the IMAGE DYNAMICS IDQ10. This is a good choice? wich I need to buy the 2 ohm or the 4 ohm? The shop guy also told me that I can use my existing Amp to run the hole system. Do I need to add another Amp or the ZX6400 can handle it? I don't want a Boom Boom sound just a SQ kick to complement the Focals!! Thanks!!