I took th fram of my trunk out to fit my subs in right (db212) and now they are facing the license plant and it sounds GREAT! However, when turned up loud there is an odd sound in the car, almost like a loud tap on glass, when i open the trunk the sound lessens and when i go back to see if it was the subs, its not! also i can have the speakers at the regular volume i use and it will be fine til i turn the subs up. When i turnn them up i hear it, it apeears to be coming from my speakers in teh door which i dont get. when i push on the door stock grills it lessens as well. mabe becuase so much vibrations that the grill is getting knocked onto the tweeter on my speakers? if anyone has any suggestions id love to hear them.