this realy is strange, when cornering hard the sound from the speakers moves with the force of the cornering!!!! i have rockford fosgate 6x9s in the doors which as far as i can tell are fine apart from that and a rockford headunit the system is standard. this started few months after i installed the speakers so i dont think its anything to do with that, any ideas??????

Dry joint in the speaker cone? Have you checked the connectors? One might be loose.

yeh ive tryed the connections and nothing changed. i understand the wires have another connection between the door and the head unit so im gunna try them at the weekend. it only happens during hard cornering so im wondering if the speaker moves could the magnet be affected by the window mechanism? its screwed in realy tite but the door card may be flexing