For many years now, I've been using two pair of B&KM-200 Sonata monos to bi-amp my Mirage M3-si speakers. One time a pair of my B&Ks was out for repair, and I was running on the one pair remaining. I noticed that there was a slight loss of fullness in the sound, but it was noticeable only on recordings that were light on bass/tonal balance to begin with; a subtle difference, but nonetheless audible. I don't know if this is inherent with a setup such as mine or a result of the particular amps used.
More recently, I've been considering an upgrade to my amplification (that's if my work situation stabilizes). Depending upon the new amps and their cost, I thought to perhaps forego bi-amping and just bi-wire. What would be the technical or theoretical advantages or disadvantages of one method over the other? I'd be interested in the perspective of any out there.