Have you ever tried this:

1) Change your audio settings - at least newer Windows versions has possibility to change overall sound effect that all the sounds sound like they've heard in concert hall, stone cave, arena, and what else, there are many possibilities. And also, frequency change (or whatever it is in different language versions) to rock, bass, pop, etc.

2) Play TEF. Sounds epic (alternatively just weird).

I have now "auditorium" and "rock" on. Suddenly all voices sound really awesome with nice echo.