A full orchestra’s sound can blanket a soloist’s spectrographic trace.

Evidence

This is a moment in the score when the orchestra stops playing and leaves the tenor singing alone. The orchestra stops approximately 500 ms into this example: its spectrographic record can be seen particularly in the lower left-hand corner of the spectrogram, where it is almost impossible to analyze any detailed acoustic patterning. — David Howard, Jamie Angus, coustics and Psychoacoustics, 1487