Johnathan,
You might have better luck getting an answer to this question on the PSR Tutorial site.
I’ll check it out!
I sold a bunch of the Yamaha YST-MS50 2.1 systems back when I was selling. It’s the same wattage... 20w x2 and 40w to the sub. I still have it hooked up to my living room TV.
I’m getting closer!!!