Installed the MTX stealth box with a MTX Pro150x2. I used the existing sub inputs for the speaker level inputs on the amp. I installed the amp in the spare tire are after inverting the spare. I ground the paint down at an existing hole, and used the shortest piece of ground wire that I could. I ran the power wire from the battery down the passenger side of the car. After getting everything done, I am getting interference on the radio with the amp turned on. The radio signals are much weaker now, almost like the amp is interfering with the antenna. When playing CD's, it just hits HARD, but the radio sounds bad. Any ideas?