I have always had this problem and can't solve it no matter what headphones I use. I've tried Bose headphones regular apple earbuds etc and with the volume all the way up I can barley hear any audio being recorded even if the mics are all the way up. Is there a setting I'm missing?
You're right, it is extremely low. Also, the volume level that the manual recommends that you record at on the meters is too low as well "one mark to the right of 20" or something like that. Get some headphones that have their own volume adjustment on them.