How big is the wire then? Where is the sub and amp - the boot is usually best
? I would run the cable under the carpet and plastic trim down the side of the seats and into the boot. What makes and models of the parts are you using. (I'm probably being a bit thick here and missing something but I'm still ill in my defence!)
I wish you a warm welcome to Torquecars - nice to have you along and you'll soon have some serious sounds in your car! (P4Paco knows stuff about ICE!
)