stereo mix

Hi everyone, I have a stereo+sub setup connected to my PC. I use the case front jack for the stereo speakers and I attach the line in of the sub amplifier (a TPA3116) to the mobo green output. Now, I have always used stereo mix to split the sound output and it has always worked fine. I know I...

I have an Acer Aspire with 1 Headphone jack input and 1 output and something called stereo mix, which I just cannot make sense of! My laptop is connected to a fairly old JVC TV. I have 2 sets of 2.1 PC systems I'd would love to somehow setup into a surround sound system. I'm not a rich man, so...