lol me no so good with words some day either.... and I understand what you are saying...

heat exchange = not isothermal unless you are at a steady state equillibrium...

 

Very interesting opinion...learned something everyday.

 

ahh yes ... but the circuits are at a constant temp (though individual components will be at different but stable temperatures) so its electric characteristics should be stable. heat in= heat out (that is why it takes more than a few seconds to get warm). I think we are agreeing that a lot of angels can dance on the head of a pin...

to the room the amp is a heat source
and the room is a heat sink to the amp

aint thermodynamics grand

 

I hated thermodynamics - my prof was a moron.

Good thing I'm really fricking smart or I would have been done for

 

If you put it like that you would be right, so long as the room is an open system...

But if you want to break it down... consider that the thermal time constant of a component like a mosfet is going to be short compared to the dynamic nature of music (range would be like .1 to .5 seconds).... that basically tells you right there that there is no way you will find a steady state thermal equilibrium inside the device while pumping music through an amplifier.. the temperature of the fet will jump around with the signal, and there is no way isothermal conditions could be met...

If you played a test tone that lasted for a long time in relation to the time constant of the heat sink with the other condition above met then yea you could consider the fets to be running under isothermal conditions...


all that aside so we are on the same page, I think the really important point is that an amps temperature is not going to make an audible difference....

 

You won't even notice the difference if it does.

_____________________
McIntosh MC207 Power Amplifier - Get the MC207 Power Amplifier catalog by McIntosh Laboratory, Inc.

 

I seem to recall several test reports on various amplifiers, noting that performance improved after a significant warm up period at moderate loud levels.
There is a venerable line of 2 ch. British Home Audio that I carry, and their amplifiers come with a notice to the consumer stating that, the unit they purchased, will require 36 hrs. of "break in period" for optimum performance.

Maybe "Mythbusters" should take this one on.

 

^ yea I think so...

 

True dat. My worst course.