I'm back on the Bi-Amping/External Crossovers debate again. To summarise from my limited understanding. When using 2 or more amps per speaker each amp channel is still processing the full frequency range, irrespective of the fact the speaker's internal crossovers will ignore frequencies not required for that particulur driver. With this in mind....How can Bi-Amping add anything? Low Channel amp's High Freq and High Channel amp's Low freq parts of the signal are, I assume discarded. In order to give each amp channel more "headroom" and hopefully improve sound quality the only realistic option is to filter the frequencies after the pre-amp stage but prior to the receiver's power amps. Am I correct? If so... What external crossovers would anyone recommend? Specific makes/models would really help please, I'd be using them with a Denon AV-A10SE/POA-T10 combo and some Kef Reference speakers (Either 1.2s or 3.2s) Does any manufacturer make a single unit (1 box) piece of kit that can handle the external (either bi-amp or tri-amp) crossover requirements for all three fronts? Cheers, Mark.