I'm having a major issue with vibration and am not quite sure the best route to overcome this. I have already installed sound deadner (b-quiet) in the trunk and on the doors but I'm still getting quite a bit of very noticable resonance from my trunk. I was thinking of putting another layer of b-quiet but I dont think one additional layer can overcome this...

My setup constitutes;
Amp - Lanzar OPTI2000D @ 1 ohm (1.6kW rms)
Sub - Lanzar OPTI1532D (15 inch)
Enclosure - Spare tire well sealed with sub inverted
Car - 2001 Cavalier 4 door sedan

Any advice would be greatly appreciated...