My teacher told me I could sing the low Ab. This is really strange because I have another experience. I have tried singing low notes before but never really sang that low before. Today I could not come close to that low pitch. At the lesson she said she heard me sing Ab but I cannot sing the Ab at home. It can't be more difficult singing low notes at home. I even check with a pitch tuner.
How can the teacher and my experience be that extremely different? Anyone who can tell what might be going on? Would another teacher say something else than the teacher I went to when it comes to low notes?