I have the Infinity system in my '07 Sahara and did the Kicker speaker upgrade with the polyfil that everyone suggested here. It made a marginal improvement to the back speakers but not drastic. So my next thought was the amp upgrade to the 77KICK46 but have not found much posted on that to know how much it helps. Has anyone done this upgrade and did it help with the sound from the soundbar speakers? Any information is appreciated before throwing away more money on something that doesn't help. I would rather put that money into a new head unit and amp if this kicker amp upgrade uses the same settings as the factory amp but only slightly more power.