I have had quite a few Samsungs and they've all made similar sounds (including the Tab 10.1). At first I was worried I got a defective one, but after looking into it, I am pretty sure the popping sound is actually the speaker turning OFF.
I know that might sound weird, but turn it up, listen close, and see what you think. My thought is, the speaker turns on, makes whatever noise it is supposed to make, and then has a short delay before completely turning off.
Let me know what you think.
