I currently have three computers which I want to simultaneously output to my speakers. I've heard that a mixer is good for this, but I don't have any experience with them. However, I have a 4.1 ...

First, I'd like to provide a little background on the project. My goal was to create budget, but decent Karaoke setup on server b0x. NOTE: The Y-Cable has 2 1/4" to one 1/8" connection. The 2 1/4" is ...