Why does my amplifier get hot?
It is normal for an amplifier to get warm during use.
The amplifier converts electrical energy into an audio signal, but some of the energy also becomes heat.
How hot the amplifier gets depends on factors including its design, load and ventilation.
What affects the temperature?
Amplifier class
Different amplifier designs have different efficiencies.
Class A amplifiers normally generate considerable heat, even at low sound levels.
Class AB amplifiers also generate heat, while Class D amplifiers are generally more efficient and often generate less heat under comparable loads.
Speaker impedance
Low-impedance speakers can place a greater load on the amplifier and contribute to a higher temperature.
Sound level
The more power the amplifier delivers, the more heat it may generate.
Ventilation
If the amplifier is in a confined space or has blocked ventilation openings, heat may not be able to escape easily.
How hot can the amplifier get?
This varies between models.
Some amplifiers are designed to get relatively hot during normal use.
The most important thing is to follow the manufacturer’s recommendations for ventilation and ambient temperature.
What should I do if the amplifier gets very hot?
Check that the ventilation openings are not blocked.
Make sure the amplifier has sufficient space around it.
Check that the speakers’ impedance is compatible with the amplifier.
Check that no loose cable strands are causing a short circuit between the speaker terminals.
Avoid playing at very high volume for long periods if the amplifier shows signs of overload.
When should I stop using the amplifier?
Switch off the amplifier if it:
Repeatedly enters protection mode.
Starts to smell burnt.
Makes unusual noises.
Switches itself off due to overheating.
Shows other clear signs of a fault.
Allow the amplifier to cool down and check the installation before using it again.
If the problem persists, the equipment should be inspected.