[KozmoNau7]

The cheap Behringer mixer I use for voice chat, karaoke and so on has a selectable 80Hz high-pass filter, I can't remember ever switching it off on the vocal channels, except to parody that Howard Stern-esque huge bottom end with heavy compression radio host thing.

Using a decent microphone (AKG D5 in my case) and a little bit of tweaking (just a low cut and some compression is a good start) instantly puts your sound quality in voice chats so far above everyone else using cheap headsets or their laptops' built-in mics.

Anecdotally I've found that sounding more authoritative makes people listen a lot more to what you say, instead of zoning out.