Importing audio problems

Hey kids. I recently developed an issue importing audio from CD about a week ago. All imported audio from CD is really quiet. I'm using iTunes for audio import. My settings for importing in itunes have not changed. I never had a problem with audio quality before. I enhanced the importing options & the audio is still quiet compared to the CD. I'm wondering if it may be an upgrade itunes issue? or if it could be something else I'm not seeing. I'm not the most computer savvy individual out there. Any help would be appreciated. Thanks.