So technology in the hi-fi world is crazy at the moment with DAC's and more settings on amplifiers that we could ever dream of. Not that i'm complaining but i want to go back to something that has been around for a while. Bi-amping. I've been bi-amping for about 4 years now with 2 Cambridge Audio 640A's. It sounds great but i've read that this is not true bi-amping. True bi-amping is when you remove the passive crossovers inside your speakers and split the signal before you amplify with an active crossover. One amplifier will only amplify low's and the other one high's. Now this is where I have questions. Why are speaker manufacturers not manufacturing speakers without passive filters and why don't you get amplifiers with crossovers built in (I think one of the Onkyo's have one built in now). My point is that to actually do true bi-amping is quite a mission and you will have to buy an active crossover. Has someone here tried this and what is the result? Is it worthwile to investigate? I've heard you double your output. It almost seems like removing your passive filters is a mod that manufacturers dont want you to do and that we have to stick with bi-wiring (which in my opinion makes no difference) and bi-amping with the full audio spectrum.