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Old 5th May 2007, 06:10 PM   #1
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Default New Rockford Fosgate Amps Efficiency

The new rockford amps say that they average an effeciency of 70% yet they are class A/B. I'm not an amp expert, but I thought that a class A/B amp could not be that efficient. Is this possible, or is it just another part of marketing?
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Old 5th May 2007, 06:57 PM   #2
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70% efficiency at what power level?

If you drive a class a/b amp to full power or into clipping, the efficiency can approach and even exceed 70%. The efficiency issues come about at lower power, at 5-10% power output, where the amp will spend almost all of its time. At these lower power levels the effiency will be closer to 20-30%, I don't know how the RF amps could be any different, it's just a property of how class a/b amps work.
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Old 6th May 2007, 10:38 PM   #3
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Could it be a modulated supply that is 5-10V above required collector voltage?
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