New Rockford Fosgate Amps Efficiency

paintrodsey · 5th May 2007, 06:10 PM

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?

sr20dem0n · 5th May 2007, 06:57 PM

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.

ifrythings · 6th May 2007, 10:38 PM

Could it be a modulated supply that is 5-10V above required collector voltage?

5th May 2007, 06:10 PM	#1
paintrodsey diyAudio Member Join Date: Apr 2006 Location: Lincoln	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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5th May 2007, 06:57 PM	#2
sr20dem0n diyAudio Member Join Date: Apr 2005 Location: Broomfield, CO	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.

6th May 2007, 10:38 PM	#3
ifrythings diyAudio Member Join Date: Oct 2005	Could it be a modulated supply that is 5-10V above required collector voltage?

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