it does seem underpowered at first - there's no further information on whether the 50W per channels is all channels driven or tested with one channel at a time, or whether its a 1kHz sine wave, or a full range 20hz - 20kHz signal. Most AVR power specs are given tested 1channel at a time running a 1kHz sine wave so the real-time power output during a movie is almost always lower than the stated (read this article)

If they rate it like they rate stereo amps (tested all channels running 20Hz~20kHz), the 50W should be enough for a small room - going by the power required calculator. i.e your seating position should not be more than 6ft from the speakers


???

next time, ask before you buy or don't ask at all. It's like asking for buyer's remorse

overheating Onkyos? naah, not jealous at all.

I was direct to the point - don't ask after you buy.