Why does an oboe have a more nasal tone quality than a clarinet?

The difference in tone quality between an oboe and a clarinet arises primarily from their distinct acoustic properties, which determine the specific overtones present in their sound.1

The timbre of a musical instrument is defined by the number, frequency, and relative intensity of the harmonics it produces. The oboe features a conical bore and a double reed, which cause it to function acoustically as an open tube. This configuration allows the instrument to produce all harmonics, resulting in a complex, penetrating sound often described as nasal.12

In contrast, the clarinet utilizes a single reed and a cylindrical bore, causing it to function acoustically as a closed tube. This structure emphasizes odd-numbered harmonics, particularly at lower frequencies, which gives the clarinet a different, less nasal tonal character compared to the oboe. Ultimately, these variations in bore shape and reed type dictate the harmonic spectrum of each instrument, creating their unique "tone colors".213