Review on Road Kill RKFR6 Speaker Enhancer by Tommy Hilmy

The last time I installed speakers was over twenty years ago. When all my research kept coming up with products like this, I figured I'd try them even if we didn't. I was so skeptical that I only installed one side at first. In truth, I could only tell a small difference as I sat still and tried to compare them. BUT when I put it on the road, particularly a bumpy gravel road, I heard a significant difference between the two in sound quality and reduced "door rumble". So, of course, both sides have them. Installation is very easy and I highly recommend it!