Hello,
You should be able to get around 2-5x the sound by pressing and installing the speaker more firmly. To do this, take off the white sticker and adhere the speaker firmly against a flat surface. It may help to have the Video Player on with a video playing and testing the audio while pressing on the speaker.
Otherwise, there is some volume control and settings that you can play with. The settings menu tutorial is here:
https://learn.tinycircuits.com/Kits/TinyTV-Tutorial/You may also want to try converting videos with higher volume, as the volume level at the time of conversion is the volume level you end up with.
Let me know if that helps!
Thanks,
Réna