I am not sure if this is the correct NG but here goes.
I have a vintage Techics Hi-fi system that has stood idle since the
arrival of widescreen TV, mainly because it is on the opposite side of
the room.

The TV is connected to a computer that runs Mythtv an serves as an HTPC.
It has a cheap 3-speaker pc system that is an improvement on the TV's
speaker but is in no way "good".

We plan to move and I wondered if the hi-fi system could be geared to the
TV and /or computer. I am uncertain as to the best way to connect up.

Inputs to tha ampifier are all phono sockets.

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Mint 20.0, kernel 5.4.0-42-generic, Cinnamon 4.6.7
running on an AMD Phenom II X4 Black edition processor with 8GB of DRAM.