Biamplification is simplier by Y-connecting both receivers from sources. You'll need to have speakers with biwired binding posts.
Receiver monoblocs
I have two Marantz 2270 receivers which have preamp out/ power amp in jumpers so each section can be used independently. My question is, can the stereo amp section of each receiver be used in monobloc fashion so I would have essentially two 140 watt monobloc amps. Or is it not that simple...