The Music Stem / The Musician's Library / Composer's Handbook / Drop-2 Voicing
Composer's Handbook
A drop-2 voicing lowers the second-highest note of a close-position chord by an octave.
Take a four-note close-position seventh chord and drop its second-highest note an octave.
Cmaj7 C4–E4–G4–B4 becomes G3–C4–E4–B4.