These guys are great. I was getting nowhere with my Honda dealer trying to fix sub woofer rattle on a new civic. Ulisses at Kartunes installed sound deadener foam on the doors and the back panel where the sub woofer was installed. The rattle is gone. The ride in the car is quieter. I am so happy with them. When I do decide to upgrade the speakers or even install an amp I will definitely return to them. They are professionals who know what they are doing and truly car about nothing interfering with the sound system in a car. Highly recommend.