My suggestion is to start with the sound bar replace the speakers and Dyna-mat one side and listen, fade to rear then back and forth. Do you like the results, if yes then Dyna-mat the other side. Same with the poly-fill, one side then listen. If you find you like one or the other or both then do the fronts too. I just did mine and found the Dyna-mat made a difference but the poly-fill that everyone raved about made the speakers sound muddy. But this is just my opinion. If you keep the HU and after you change the speakers you find the speakers pop when driven hard you may have to replace the HU. I had the 130 base stereo and when the volume was turned up past 20 with the new kickers it started clipping the signal (popping). I replaced the HU and what a difference.