This video is a basic discussion of the construction and function of three types of audio speakers: Ceramic, Alnico, and Electrodynamic. Topics include voice coils, wattage, impedance vs resistance, electromagnet vs permanent magnet, voice coil testing, effects of signal polarity on cone motion, field coils, and humbucking coils. To demonstrate construction principles, a speaker is dissected and the component parts are examined and explained. This presentation is best suited to individuals seeking a basic understanding of audio speakers.

Here is a link to the 1940 National Dobro video:    • 1940 National Dobro Amp: 73 Years Old...  

Here is a link to an EIA Code site (to identify speaker and component manufacturers): http://www.thespeakershop.com/speaker...

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