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In Reply to: RE: It is not a contest and we're both right posted by George6 on March 10, 2019 at 17:40:08:
With a class B or class A/B the power rating sets the maximum voltage swing. For your example of 200W into 8 ohms that is an output voltage of 40Vrms (as John pointed out), or 56V peak. Let's assume the amplifier voltage rails are +/-60V. Now, if it is also to have 4W of class A into 8ohms we know the DC current in the output stage must be at least 1A. So that is a standing power dissipation of 2*60V*1A = 120W. That is a fair amount of heat to get rid of and heat sinks are expensive. If the A21+ is 20% more powerful the voltage rails must be 20% higher and the standing dissipation would be 20% higher too. If Parasound are using same metalwork (likely) then they must decrease the output stage DC bias by 20% to keep the standing heat dissipation the same. That's my guess.
Regards,
13DoW
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- RE: It is not a contest and we're both right - 13th Duke of Wymbourne 18:31:26 03/10/19 (0)
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