[Hedda]

I've read that about RPi but RPi doesn't have optical toslink and I don't have a HDMI input on my HC

There are now many products out for adding more audio output option as well as adding superior sound controllers with DAC to Raspberry Pi.

Other than Hifiberry there are also PiFi Digi, and more advanced like Wolfson Pi, and even more advanced SupTronics X-Series X200 and X300.

There are also much cheaper USB audio cards with optical TOSLINK SP/DIF out that works with ALSA on the Raspberry Pi.