Why does this happen with *most* two channel amplifiers? I have a Punch 150 run it bridged to a 400 single voice coil sub it's 4-ohms. So I don't know why it gets hot. But this is not the case. I'd like some information on these type of things. Oh yeah it starts to get hot after maybe around 10 - 15 minutes of listening time. I'm not one who blasts it constatly, just to get some bass going on.
They run hot because each amp sees half the load and the current through the final stage doubles.
The amp will produce the same heat with 2 ohm stereo as 4 ohm mono. To the amp, they're the same load.
Can heat cause a amp to fail? And if so what goes first? Power supply or outputs?
Heat = Bad
For electronics of virtually any kind it is really that simple.
If the amp is getting excessively hot (can't keep a finger on it for at least 5 seconds) then consider using forced air cooling. Conveniently, PC case fans run off of 12 V DC...
For electronics of virtually any kind it is really that simple.
If the amp is getting excessively hot (can't keep a finger on it for at least 5 seconds) then consider using forced air cooling. Conveniently, PC case fans run off of 12 V DC...
The power semiconductors used in amps are derated (can handle less stress) as the temperature increases.
The design of the amp and the type of signal determine which fails first.
The design of the amp and the type of signal determine which fails first.
It's a Punch 150 (first series) runs kinda hot even at 4-ohms mono I don't know about the gains? But it sounds awesome. Is there anything I can do to keep the temperature down? I don't want it to burn up even in hot sunny days my amp is hot even thought i wasn't using it. Should I install a fan or something?
Yes. A fan would make it more reliable. Mount the fan as is shown near the bottom of the following page:
Modified Punch 45
You can make a simple fan controller like the one the following page. Click on item #8 at the top of the page if this doesn't bring you directly to it.
Basic Switching Power Supply Design Tutorial
Modified Punch 45
You can make a simple fan controller like the one the following page. Click on item #8 at the top of the page if this doesn't bring you directly to it.
Basic Switching Power Supply Design Tutorial
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