Hi- In my Dodge Ram I have a set of Focal K2 fronts and Morel backs driven by a JL Audio HD 600/4 amp- If I wanted to take a jump up in performance and sound quality am I better off upgrading the speakers or amp- Or is what I have enough that I would not get a big jump in performance by upgrading- Also any rec. on amp or speakers for upgrade- thanks for the newbee help-