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Forums › Home Theatre (including HTPC and EPG Collector) › power ratings rear panel
cameron999

17 posts

Geek


#195988 14-May-2016 20:35
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hey, do the power ratings on amplifiers on the rear panel tell us much?

 

 

 

a yahamah amp boasting 85w per channel 8ohms with 220watts on back panel

 

 

 

pioneer boasting 60w per channel 8 ohms with 500watts on rear panel

 

 

 

both 2 channel amps.

 

 

 

can anyone help me with this?

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tripper1000
1617 posts

Uber Geek


  #1553368 16-May-2016 00:50
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The guys above are right in your particular context.

 

 

 

IMHO, the THD % is the most important figure when comparing one amps power rating to another. As a very general rule, the human ear will notice distortion over 0.1% so distortion ratings above this are dishonest.

 

 

 

As an example, my current Denon (40 watts RMS per channel) kicks the ass of my old Sony (135 watts RMS per channel) on the same speakers. The difference between them is that the Denon is rated at 40 WRMS @ 0.1% THD and the Sony is rated at 135 WRMS @ 5% THD.  5% THD is total useless for listening to and may as well be 100% distortion. When you followed the Sony's distortion graph down to 0.1% it is producing around 20 watts RMS, hence the Denon sounded much cleaner and clearer at higher volumes.

 

 

 

One thing the power supply rating is good for is spotting and calling B.S. on the amp output ratings. The combined outputs of the amp can never exceed the power supply rating, without breaking the laws of physics, other wise the amp would be creating energy - which is of course impossible. For instance, if the amp alleged to be 5x 100 watts RMS, but the power supply is rated at 250 watts you can instantly spot that there is no way that the amp rating is true, because there would be another 250 watts coming out of thin air, and that is before you even consider heat losses and inefficiency.

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