Though I believe I know the coloration you are talking about with "chesty," there’s also the case FOR voices sounding "chesty."
That is: many systems produce a sort of hologram of a human voice that sounds like a voice without a body. It’s all "mouth noise" and maybe a bit of throat. It sounds disembodied. Whereas a human voice, especially male closer up, does combined with a chest sound giving the voice that sense of "body" behind it.
I actually find a system that can produce some of that "chest/body" sound to be more natural and convincing. So long as it is not via an obvious speaker-like artificial coloration.