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The output from an iPod or a computer is a very small signal - probably 100 mv or around there. That is enough to drive headphones. A normal loudspeaker driver with a comparatively large voice coil needs a much higher voltage/amperage (usually expressed in watts) to get it moving. That's where an amplifier comes in.
Ian
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'87 Carrera Cab
----- “Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.” A. Einstein -----
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