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Ohm definition (archive)

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Posted by ///Mcarter on August 01, 2001 at 14:34:54:

In Reply to: Aftermarket sub w/ stock amp - what ohm rating? posted by Kevin on August 01, 2001 at 14:00:23:

Ohm is a measure of resistance.
Most home audio systems use 8 ohm speakers (I think Bose uses 6), most car based systems use 4 ohms. In other words, car stereo speaker have less resistance than home speakers.

When you wire speakers in a series, you double the ohm rating of the speaker (aka, if you wire 2 4ohm speakers in a sieries, they together, produce a 8ohm rating)

When you wire speakers in parrallel, you split the ohm rating (aka, if you wire 2 4ohm speakers in parrallel, they together, produce a 2ohm rating)

It is very important to understand this, wire it correctly, and to now what the ohm rating expectation is on the amp being used. If you wire to 2 car speaker in parrallel and connect them to a home receiver, you will most likely overheat the receiver. It is possible to blow amps by using incorrect ohm loads.

Hope this helps....
-///Mcarter


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