BRW, you appear to have picked up some misinformation in your reading elsewhere. Specifically on the two main points you mention here, a receiver can't be used to "bi-amp" a speaker and you can't simply "give" a speaker more power.
Bi-amping by definition requires two amplifiers; a receiver has only one amplifier with several output channels. The output transistors in each channel just act as valves to distribute the required amount of voltage needed in each channel at some instant in time from the receiver's power supply section. The individual channels have no power of their own, it all comes from the limited supply available in the main central power supply. Distributing this to a speaker through two channels rather than one can't increase the power available by any amount.
As to "giving" a speaker more power, that only takes place when it's played louder. At a given loudness level a speaker uses only the amount of power for which it's designed, regardless of the amplifier. At a comfortably loud level speakers of typical sensitivity, such as the Axioms, use about 1 watt. Brief peaks can take much more, of course, but unlikely anything beyond the 100 watts or so typical receivers can easily support. Adding an amplifier with a maximum capacity of 200 or 2000 watts doesn't accomplish anything. Unused headroom is simply that: unused.
