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How to make a TDA2003 10W amplifier give less than it's rated output? Answered

I need to power a single 4w speaker, but can't get an amp for it, so I need to use the tda2003. Should I decrease the circuits voltage? Or is it not possible?

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Just turn the volume down on the input. If you put a resistor in series with a volume control, you can set an absolute maximum volume for the output.

Just asking you the question back, so you can think why it might make a difference: It won't unless you turned the supply voltage down so low that the chip wouldn't work properly driving the demanded volume into the speaker.