I just bought a sub n amp. I have the stock CD player, so I did a line out converter. First question is I only hooked into the back speakers, should I do the two door speakers also. Will it help, make that much of a difference? And of course I have so much rattling. The trunk lid. Under the...

I have a 12" JBL sub and baseworks amp and box and when ever i play it loud i get a lot of vibration and rattle noise. I have my entire truck installed professionally with dynamat but it didnt seem to help.. Ive noticed that the dome light is one of the main reasons for the ratttle noise and I...