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Quite simply, The speakers impedance is a measure of how much
it will resist the flow of power from the amplifier. Most speakers
are rated at 8 ohms. The important thing to remember is that
the more speakers you run off a single channel, the less
the total resistance is.
The formula for this is:
where Rtotal is the total resistance seen by the amplifier,
R1
is the resistance of the first speaker, R2 the resistance
of the second and so on up to Rn
which is the resistance of the
nth speaker.
If you run two 8 ohm speakers off one amp channel, the combined
resistance reduces to 4 ohms. Add a third, and it reduces
to 2.6 ohms. A fourth, and it goes to 2 ohms. So, you must be
careful when running several speakers that the amplifier will
run power into 2 ohms. If it wont, you may damage the amplifier. |
