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.
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.
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