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load vs response question

Old 03-05-2012, 07:03 PM
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load vs response question

If a speaker is a variable load (different impedance at different frequencies)how will a speaker respond on an amp where the watts double from 4 to 2 ohms vs one where the difference is negligible? (ex:alpine pdx) Lets assume the speaker is rated at 4 ohms.

Last edited by troncat; 03-05-2012 at 07:11 PM.
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Old 03-05-2012, 07:11 PM
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you need to review Ohms law: V=IR Power = (V^2)/R

An amp is a voltage gain device. Assuming same voltage out for all frequencies, then just use the power equation.

The 2 vs 4 ohm power rating of an amp is the MAXIMUM output.

So yes, if a speaker's impedance varies with frequency, so will the power it draws and dissipates given the same voltage, regardless of the amp's 2 vs 4 ohm maximum rating.

So if a speakers impedance doubles, then its power draw will halve.
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Old 03-05-2012, 07:44 PM
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would the response curve change between the two?
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Old 03-05-2012, 07:50 PM
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Originally Posted by troncat View Post
would the response curve change between the two?
Not unless you have reached the maximum output of the amp!
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