Biamping, yes or no?

Biamping is useful for live pro sound, but not so much for home audio, unless using "active" speakers with built in amps which can work fine (home recording studio monitors...save space). Otherwise, there are many good reasons why almost nobody does that, one of which is it usually doesn't sound better. I'm in the camp of using well designed smaller amps to get more bang for the buck, as lower powered amps from the same maker can have the tone mojo without wasting money on unnecessary extra wattage. Modern well designed passive crossovers from well regarded designers usually sound great...to believe otherwise is silly.