Wind instrument resonances resist aligning into a harmonic series because of impedance-mismatch reflections.

Evidence

Wind instruments do not come by a musical alignment of their resonances as easily as stringed instruments do. The reflections (due to impedance mismatches) that toneholes, valves, diameter changes, and bends introduce make it far from obvious that the instrument resonances will line up nicely in a harmonic series. — Eric J. Heller, Why You Hear What You Hear- An…, 1425

Categorization

• XREF: Connects to the puzzle of how brass/woodwind players nevertheless get harmonic series—relates to the book’s earlier stringed-instrument resonance discussion.