The gritty voice is for when you need that hardened, frazzled, tough-guy quality in your projects. This is the kind of tough, inexhaustible voice that gets the job done no matter what in the face of insurmountable odds.
The gritty voice is exactly what comes to mind when we think of those hard-boiled noir detectives and modern antiheroes that still have an enduring popularity. The gritty voice is tough, no-frills, and takes no prisoners. It's all about conveying strength, resilience, and a no-nonsense approach to reaching the finish line, whatever the cost.
Gritty voices, despite not seeming very approchable, are very popular for a variety of reasons. Sometimes you need a grizzled, hardcore character to pit others against, or to show the main character the toughness that comes from experience. Others, like Batman, are the main character, and have an uncompromising aspect to their alter ego that makes their enemies quake in fear when they hear their gritty voice. There are other times when gritty voices are played for laughs, or as a parody. There's nothing like using one of these voices to portray a character who needs to lighten up a bit (or maybe benefit from some throat lozenges).
Raspy, gravelly, and deep-throated. Those are the hallmarks of the throaty barks of a gritty voice. It always seems like the character is making a tremendous effort to get the words out. The rythm tends to be slower, more forced and deliberate.