Hi All,
My gadgets; Raspberry PI2, running Libreelect and Hifiberry Amp2.
How to use above setup to receive external TV audio output and send through libreelect and Hifiberry to the connected speakers. 
This is a site specialized in LibreELEC OS. I think HiFiBerry handles audio outputs, not inputs. For hardware related questions look at an RPi forum or search the internet for "Raspberry Pi audio input". Maybe this will solve your problem.
There is no way to do that. The RPi has no ADC, and the Amp2 has no input.
Some HiFiBerry cards have audio input and mixing capabilities.
Those cards work on LE (you get multiple output device options, one for mixing).
If you're an electronic nerd, you can add an ADC for small bucks: Click!
This solution requires apt packages, which LE doesn't offers.
So better use "Raspberry Pi OS" and "Kodi" package for this.
