HI
I have listened to your file.
In my opinion, its not that the sound is too thin necessarily. There are lo frequencies present, but the recording suffers from
1) Too much distance. The mic is not near enough to the speaker
2) To much ambience. mic is picking up a lot of room reflections in addition to the direct sound. This makes it sound a little “boxy”
3) To lively a room. The acoustic of the room is poor. Hard, reflective, parallel walls make it too lively a space.
4) Poor amplitude. The recording levels are very low. Merely turning up the signal in a desk will also raise the room and bg noise with it so yes the voice will be louder but everything else will increase.
Clearly as there are no pictures, Im guessing that these things are all contributing in a negative way for you.
In summary, i dont think theres much can be done as removing reverb is not something Im aware is possible at the moment.(If anyone knows different please send me the details and Ill be very happy)
Is re recording a possibility.
If so get these things right
1) location. look at the space and get one with plenty of soft furnishings, carpet and a less bouncy space.
2) Get a quality mic in close.
3) Look closely at your record levels.
4) Forget the viewfinder. Put on the headphones.
Peter
Post Production Dubbing Mixer