Originally Posted by sswails
Alpine System. I was messing around with my meter and decided to check the resistance value. Here is what I got.
Center speaker appears to be 2 ohm ( 2.1 )
Front 6x9's tested at 2 ohm (2.1 )
Front Tweeter tested at 6 ohm ( 6.1 )
Factory Sub tested at Dual 2 ohm ( 2.2 )
What you are measuring is the speakers resistance, not its impedance. They are not the same thing. A speakers impedance changes with frequency and cannot be measured by just connecting up a multimeter to the terminals and taking a reading.
As a rough and ready guide to get somewhere close to knowing the actual impedance from the measured resistance you need to multiply the result by 1.3. Even so, this is not really that accurate.
For a more concise description take a look at epanorama.net/Speaker impedance