location of radio modual for speaker output

[Rlc37]

Does anyone know where the actual radio module is located. it is not directly behind the screen. i am looking to add an aftermarket amp and need the signal coming out of the radio to hook up LC7i line out converter. can not take signal from the speaker location because their is not a full range signal at the speakers since it has factory components. even a picture of the location would help. i do not have the Bose system but it has 7 speakers factory