I'm looking for a good solution to connect a 2.1 system to a raspberry pi with an input from a TV as well. The L and R speakers are passive and the sub is amplified. The sub is remote, so I have a wireless transmitter sending to it which requires line level.
Ideally, I would like a TOSLink from the TV to the Pi, then a DSP with a line out for the sub and 2+ channel amp for the speakers. Currently I'm using a Fosi 2 channel amp directly connected to the TV, but I would like to get rid of it since I can't control it electronically or change the crossover.
Is this possible with any of the HiFiBerry stuff? The Beocreate seemed the closest, but it doesn't seem possible to get a line out from it. I'm not sure how good it would be to convert speaker level to line level.