Hi all i am brand new on here and site looks very good....

The question i have is...
I have a 96 XJ6 Soveriegn with the factory amp & cd changer with the subwoofer fitted in the rear shelf
Now firstly ref the sub i cant hear it i know its working but cant hear it...

If i wanted to change the headunit is it a straight forward job (ISO) lead or much harder job..

Please help if you can

Thank you in advance