They do not include input coupling caps because not all applications need them. Same with output coupling caps. Further there are various grades & types which "some" people claim affect the sound, and some people will pick a cap value that makes a high pass filter for their application but others don't want that.
However I was referring to bulk capacitance on the power rails on the amp PCB, having the chip on a breadboard with no oscillations is not evidence it meets specifications at the power level you used nor higher power. Higher output requires more capacitance. You might choose to integrate the power supply circuit onto the amp PCB to serve as this capacitance yet that is another example of why not to put it in the chip, to keep cost down and controlled by the amp designer.
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All I am saying is when I connect my iPhone headphone's output to my 400 watts flat response monitors/speakers without using any amplifier, they sound great. I read somewhere that iPhone has a built-in class D amplifier that delivers up to 1.5 watts of audio per channel. It even senses whether I have headphones or external speakers attached and automatically changes the output from 400 mw to 1.5 watts based on the impedance of the speakers and the length and connection bands of the male connector. Very smart.
Back to my L 4780 project.
Back to my L 4780 project.
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