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Restricting the air flow by stacking the amplifiers or putting them in an
enclosure may increase the operating temperature until the internal fan is
switched on. This should only operate when the amplifier is being worked
enthusiastically, or has restricted ventilation. If the ventilation is very
restricted the amplifier will shut down until its touchable surface has
dropped to a safe value. This is to meet international safety regulations,
not to protect the circuitry which can operate reliably with the case very
uncomfortably hot to touch.
When operating, the fan draws cool air in through the back of the amplifier,
and blows it along the heat exchanger until it exits through the front, top
and bottom.
The amplifier is fully protected against over heating, but this is only for
protection and should never operate in normal use, whatever your ‘normal
use’ is. If you only ever listen at moderate level, you may never notice the
temperature rise above idling. The high thermal mass of the case absorbs
short periods of high power input with a slow and low temperature rise and
the natural convection through the heat exchanger transfers this to the
air. However, the last thing you want is for your audio system to shut down
if you are having a party. So always ensure the installation provides plenty
of ventilation.