FROM
http://www.bcae1.com
Forced Air Cooling
ddUsing fan cooling to force air through the fins of an amplifier's heat sink, will significantly increase the reliability of an amplifier. It is especially important when the air flow to an amplifier is restricted (like when it is under a seat). If you only install one fan on the amplifier, make sure it forces air through the fins of the heat sink. As I said in another section, the semiconductors are mounted to the heat sink. Some people cut a hole in the bottom of their amps to blow air onto the circuit board. If that's the only fan, it will do very little good. If you have a fan blowing on the fins of the heat sink and want to mount another fan blowing inside the amp. it will serve to keep the transformer and large filter caps cool (not necessary unless you're driving your amp hard for long periods of time). If the amplifier has a built in fan, make sure that the added fan does not interfere with the built in fan. For example, do not try to force air into the exhaust of the fan cooled amplifier. Also, if an amplifier has a built in fan, do not make any new openings in the amplifier's case. Chances are very good that you will adversely affect the cooling of the amplifier/dd
Now i made cooling solution for my own amplifier , it really get hot when it play it for too long , Just like human , electronic stuff need to have cool temperature so that they can work easily , when electronic components heats up , the crosssectional area of wire ( it can be hair sized thin wire) ,due to thermal expansion , it expands which slow downs the speed of flow of electron , thats mean drop in efficiency thats causes compoents to work slow rather the working faster in cool temperature
so this is the reason that when electronics stuff gets heat up , they lose efficiency
Similarlar , Amplifier classes
CLASS AB 60% efficiency , A 2ch amplifer of 400Wrms wil produce approx 220Wrms on heat up
cause 40% of energy will be losed by heating, this is why i designed forced cooling solution to increase the reliability of amplifier , as mention in bcae1.com
Class D 80 % efficiency ,A mono block Amplifier of 1000Wrms , will produce 800Wrms on heatup ,20% energy waste on head up
