Disclaimer: Saying I have very little knowledge of electrical engineering theory is an understatement. I very much appreciate your help and patience. I'm not finding any questions similar to mine, but this could very well be due to me being completely off base in my understanding of the problem.
Since I have so little knowledge on the principles at work in this problem, I will try to detail everything I'm doing. That way there is no assumptions made in terms of what I know and don't know.
The general scenario: When I connect a multimeter to the output of a ac to dc power adapter and then to the input of an amplifier board it is reading very low amperage, even when the volume is set to maximum on the computer which is creating the input. Below is a very rudimentary, and probably comical, drawing of the setup.
Specific components used
The class d amplifier board that I'm using is the wondom 2x25watt audio amplifier board using the TDA7492. the Sku is AA-AB32165 and can be found here http://store.sure-electronics.com/product/AA-AB32165. The specifications on store page require a 14V-19V power supply.
I am using an old Toshiba laptop power ac/dc adapter which states its input as 100-240V~1.2A 50-60Hz and its output at 19V 2.37A.
I am using two 16 ohm, 25watt speakers.
Input generation (not sure what the term for this is)
I'm using a RCA to 3.5mm Aux cable from my computer to the board.
My question: The multimeter on the DC amps setting is reading only 0.05A. It is my understanding that Power = voltage x current. If this applies here that means the board is only being supplied 0.95watts. Wouldn't that mean this board is not capable of supplying a total of 25 watts to each speaker if not even that much power is inputted into the board. If these assumptions on my part are right and I'm measuring the amperage correctly, why is the amperage so low and how can I increase the current draw?