There are a few reasons why your Raycons might sound muffled. One possibility is that the foam around the speakers may have deteriorated, which will cause the sound to be less audible. Additionally, if the Raycons are covered in dust or debris, it will also reduce the sound quality. Finally, if the speakers are placed near a loud noise or vibration source, the audio may be distorted. In all cases, restoring or replacing the speakers will usually fix the issue.