Did it first with the cheap converter of Deluxecable tried wherein the processing affects also very good.
This, however, has a lot of volume, treble and bass mainly swallowed, so the tone was not strong enough.
When Oehlbach a clear powerful sound with lots of bass the way I know him.
For this I use a toslink for 7 (1m) and a RCA cable for 10 (2m).
Conclusion:
Those who place little value on good sound, you will not regret the higher price for the Oehlbach pay.