I have a one that I have not installed yet. But Italked to a guy about installing it and he said their stereo guy installed one not to long ago and it sounded terrible. Said it did not help it at all. They eneded up taking it out. They even sent it back for another one to make sure something wasnt wrong and the same thing happened. But every post I have ever seen about them people rave about how great they are. Is it just possible they had it wired wrong? Anyone else have this issue?