I did hook up the M50s to my 35 watt Toshiba receiver and am pleased with the sound. I would not turn it up past 4 on an "up to 10" dial, and volume was close to as loud as I'd go anyway.

My 14x22 ft room is very reflective since I just installed laminate flooring and the rug and furniture have not yet arrived. This should immprove sound a lot I'm thinking/hoping.

I wonder, will the new Yamaha HTR 5860 receiver make much difference to the sound? what do you think?