A singer with a bass voice of the lowest range is a basso this
Basso profondo voice range (C2C4) indicated on piano keyboard in green with dot marking middle C. [DOC] [TLE] Bass Singer - The Voice Teacher [PAR] It is a fact that some Basses are thicker and enjoy the lower range and lower ... 
Basso Cantabile: (Lyrical Bass) The Basso Cantabile possesses a voice type that
... [DOC] [TLE] How can one access the lowest ranges of one's bass voice?