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In Reply to: 8 ohms and 4 ohms in an amp posted by me on July 29, 2004 at 16:20:39:

:Ohms is the impedence (resistance) just as the other guy said. Most will handle 4 or 8. Most are actually matched to 8 ohms. This means the speaker impedence is the same as the output impedence. Volume will differ but you shouldn't damage anything. The most that can be outputted across a load is what we in the electronics business call maximum power transfer and is achieved only when the impedences are matched. This is achieved through a coil or some other type of equal resistance. This is also similar to what a matching (isolation) transformer (coil) does in addition to isolating the output load. Sort of like a cordless phone vs. a corded phone during a lightning storm.

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