Re: pinhole basic plastic speaker lab

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From: Paul Doherty (pauld@exploratorium.edu)
Date: Thu May 08 2003 - 15:28:30 PDT 

Message-Id: <l03110765bae089d487ea@[192.168.111.161]>
Date: Thu, 8 May 2003 15:28:30 -0700
From: Paul Doherty <pauld@exploratorium.edu>
Subject: Re: pinhole basic plastic speaker lab

Hi Jeff

One important part of speaker design is transferring the vibration from the
coil to the air.

In general large thin things like rubber that vibrate easily and then
transfer their motion into heat and transfer their motion accurately to the
air and sound good. While larger stiffer materials like thick plastic
don't vibrate at large enough amplitude to transfer their energy of
vibration into the air. They also can resonate and vibrate a long time,
mixing different sounds into an unpleasant combination.

It sounds like you did a great inquiry activity.

Paul D

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