Hi, I just put together amplifier using a pair of TDA2009 configured in bridge mode which is claimed to deliver 18W each channel. I found the heat has a huge role in this. The amp would turn really hot and output signal becomes ugly after puting out some 16W peak for a few minutes. I used 1Khz sine wave source. An amp channel was loaded with a 4 ohm resistor.
My question is is it true that it would be a waste if I have to make the heat sink that can help the amp to put out 9W RMS (18W peak sine wave) over a long period since in real life, songs's RMS power should be much less than that of sine waves. If it is true what is the rms power should I target? Thanks.