In four part chorale style harmony, the soprano takes the highest part which usually encompasses the melody.
Often low notes in higher voices project less, lack timbre, and tend to "count less" in roles (although some Verdi, Strauss and Wagner roles call for stronger singing below the staff). Rarely is a soprano simply unable to sing a low note in a song within a soprano role.
The soubrette voice is not a weak voice for it must carry over an orchestra without a microphone like all voices in opera. The voice however has a lighter vocal weight than other soprano voices with a brighter timbre. Many young singers start out as soubrettes but as they grow older and the voice matures more physically they may be reclassified as another voice type, usually either a light lyric soprano, a lyric coloratura soprano, or a coloratura mezzo-soprano. Rarely does a singer remain a soubrette throughout their entire career.
Spinto sopranos have a range from approximately middle C (C4) to "high D" (D6).
Source: Wikipedia > Soprano
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