An oktavist is an exceptionally deep-ranged basso profondo, especially typical of Russian Orthodox choral music. This voice type has a vocal range which extends down to A1 (an octave below the baritone range) and sometimes to F1 (an octave below the bass staff) with the extreme lows for oktavists, such as Mikhail Zlatopolsky or Alexander Ort, reaching C1. [source]
