Actually, you want your amp to be able to put out 1.5 to 2 times what your speakers can handle. A speaker rating is given in a root mean square (RMS) value. This is more or less an average. The peak voltage that the speaker can take is roughly 1.4 times this value. You want your amp to be able to push your speakers to their limit before it begins to distort. There's also some stuff about transfer characteristics, but I don't think you really want a physics lecture. Ohms and amps are related... the more ohms you have, the less current can flow:
Voltage=Current(amps) x Resistance(ohms)
Anything in your car runs at 14 volts, so as you have more resistive speakers, you need more current output. Any speaker in the 4-12 ohm range should be appropriate for consumer purposes.
All that being said, everyone should just buy some grado headphones. They're a lot better than even the $60k speakers I used in the studio.
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mmmm.... pudding
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