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Dear Jim,
As the designer of that series using my radical horizontal heat sink
radiator I can tell you that it is very efficient. However, as the power
output goes up, obviously the disappation goes up correspondingly. The
average temperature rise is solely dependent on the amount of dynamic range
that you want from your system. Those SAE amps were designed with industrial
uses in mind ie; rock concerts, discos, etc. where the dynamic range is much
more limited than in the home. Even a great many people found that my
earlier Ampzilla could be run without the fan. It all depends on how loud
you listen and the efficiency of your speakers. Remember that a mere 20 db
of dynamic range, which is not a lot, is a power factor of 100 times.
Therefore, a nominal 200 watt amp would be running an average power level of
around 2 watts. A 30 db dynamic range would have an average level of 200
milliwatts!
The only way for you to tell in your system is to disconnect the fan and
after say an hour of listening, see how hot the power transistors get (NOT
the heat sink). If you can KEEP your finger on the case of the devices
without feeling pain, then you are probably OK. If however, after a second
or two, you have to pull your finger off so as not to get burned, then the
temperature is too hot necessitating the fan.
James Bongiorno

jim albert wrote: