# Acoustic impedance

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Flute Acoustics - Part 7 - So now let's look at the acoustic impedance spectrum of the modern flute. We'll choose the fingering used for C#5 and C#6...

This video describes how to calculate acoustic impedance based on density and speed of propagation and describes some of the importance of acoustic impedance.

What is acoustic impedance?

Acoustic Impedance

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Heartless Machine by Christopher Locke; Walk The Plank is an acoustic impedance coupler. The horn is supported by a single long piece of steel, welded to a single long (and very heavy) base. There's a delightful springiness that echoes the tone arm on a vintage turntable. This horn will make the sound from your iPhone louder and richer, using no electricity, wires, plugs, or batteries. The shape of the horn is enough to add 25 decibels or more.

Note 4 Ultrasonic accessory will help visually impaired users to walk around

Production of an echo depending on relative acoustic impedances of the two media