EyeTV software version 3.6.3 and above can use two of the EyeTV Netstream 4Sat tuners by default. The other two are reserved for mobile use. However, you can try a special command in the Terminal, which is a currently experimental (unsupported) way to use four tuners all at once on your Mac. 1) Quit EyeTV 2) Open the Terminal application, from the Applications/Utilities folder 3) Enter this command into the Terminal defaults write com.elgato.eyetv “max SA