Simple hybrid instruments require many subtle acoustical principles to explain properly.

Evidence

How does Savart’s cup really work, and more importantly, how do musical instruments like the marimba work? Many of the principles discussed up to now in this book are needed to understand these deceptively simple systems. Included among them are dipole and quadrupole sound sources, vibrations of bells and plates, air vibrations in tubes, resonance and phase, acoustical short-circuiting, and near-field effects. — Eric J. Heller, Why You Hear What You Hear- An…, 1880

Categorization

• XREF: Lists near-field effects, dipole/quadrupole sources, and acoustical short-circuiting — concepts threaded through the whole hearing-perception arc.