Low playback sound

I am new to Audacity and I can’t find a way round this:
The headphones and microphone are all recognized but the playback volume is really low. I set playback to 100% and can just about hear it.
I have a Mac.

Are these recordings you made or regular known-good recordings.

(I’m a Widows guy so I might not be of much help but first we need to know if it’s a recording problem or a playback problem.)

I have only just started using Audacity so these are just test recordings…I figured I would need to test it before I start to narrate a book or two!