2582475 - N11 RADIO CANNOT BE HEARD, IS HARD TO HEAR

When the control is operated, the radio comes on, but the sound is poor or crackly.
Results of the tests
1CHECKING SPEAKER CONNECTIONSAll OKProblems metOperation
Check the connections between the speakers and the radio See   E3510  RADIO Continue to Step 2Connections not correctRestore the connections : See   E3510  RADIO
2CHECKING SPEAKERSAll OKProblems metOperation
Check the operation of the speakers.Continue to Step 3Front speaker defectiveReplace the speaker Op.   5570T90 
Front tweeter defectiveReplace the front tweeter Op.   5570T90 
Rear speaker defectiveReplace the rear speaker Op.   5570T98 
3CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentFault persistsSearch for the fault starting from another symptom'