Yamaha RX-497
The RX-496 (older model) is 75 Watts x 2 channels. This is a stereo receiver, not just an amplifier. Also, it is not really designed to run both pairs of speakers simultaneously.
If you already have a receiver with a zone 2 line level output, you are better off with a less expensive 2 or 4 channel amplifier to power the speakers in other rooms.