Jolida 1501RC with 6 or 4 ohm speaker...

What did Jolita say when you told them the speakers you intend to mate to it?

I've had no problems driving 4 ohm Totem speakers with a Jolida 1301 (30 wpc). I think you'll be fine if the speakers don't drop much below 4 ohms. I listen at low to moderate levels.

I have been running a 1501RC with a pair of large custom speakers I built 10 years ago. They are about a 2.5 ohm load and I would say they have over 15,000 hours together without a bit of trouble. The 1501 is still running the original tubes even.