The A+B Speaker terminals is the only thing holding me back from trying a Sphinx - I've heard consistently great things.
I use the Yamaha with 4x 6ohm speakers in a large, 500 sqft room. Sometimes I turn it up really loud. It doesn't break a sweat.
My upgrade path was Yamaha AVR -> Marantz PM6005 -> Rotel Int -> Classic NAD Int -> Yamaha A-S801. Those other amps didn't last long in the room. The Yamaha has been here for 2 years.
The Yamaha leaves little to desire. Good luck!
I use the Yamaha with 4x 6ohm speakers in a large, 500 sqft room. Sometimes I turn it up really loud. It doesn't break a sweat.
My upgrade path was Yamaha AVR -> Marantz PM6005 -> Rotel Int -> Classic NAD Int -> Yamaha A-S801. Those other amps didn't last long in the room. The Yamaha has been here for 2 years.
The Yamaha leaves little to desire. Good luck!