Hi notech, see your in Gibraltar, small world as my family are from Gib anyway I digress, if you have the most setup then the speakers will be running from the amp location which I think is in the front trunk.
Have a check of the connection from the amp as if you are running MOST then you have to tap the speakers from the amp side as output from stereo was optical.
I have just replaced my CDR23 & Bose amp with a Pioneer X5600BT & fitting kit from eurospeed & it looks & works great
Dan
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