I agree that the Epic was louder but compared to other devices the epic was the loudest.
Compaing the EVO LTE to the EVO 4G the LTE is louder BUT i have noticed some apps are quiet.
ESPN Watch is just such an app. The max audio out of it is about 30% quieter then other apps.
However music is still plenty loud for me. In fact its louder then my Og EVO.