https://www.technisat.com/de_DE/DIGITRADIO-10-IR/352-10774-22920/
Here is one location to buy, others offer price down to 80euro, it comes with a remote control, which also has bass/treble eq, sound level output.
I'm using it for a beomaster 4500, didn't try it on a line in on speaker, but sure it will.
Ol