bi amp imrpoving?

We're not so different. You're preaching to the choir. I'm currently biamping with dual bridged Plinius SA-100's and a 1600W bass amp with separate active low and high pass filters. Don't ask how much that totals. Before that, I passive biamped Kappa8's from Mission 777's for the bass and Monarchy SE-100's for the mid/treble. Entirely different ages, characters, gain and feedback, despite both having the same wattage rating and being MOSFET. DIY'd a custom attenuator and got the best out of both. Going active could have been even better but that's a whole 'nother kettle of fish. That's just my own stuff. I've put together some wacky and extremely loud combinations for others.

Would I recommend biamping to the OP, after the way he phrased his post? NO. It was far too vague to indicate that he comprehends what he's getting into. Had he supplied some specifics or given any clue as to his competence, I would have been glad to assist. Maybe, I've just seen too many biamp threads.

Hi Ngjockey, in reference to your response, one of the reasons I go with very similar amplifiers (having basically the same gain) is that I prefer not to have to introduce outboard attenuators into the system, in addition to wanting as uniform sound as possible with seamless transitions between drivers. (I also use the same power cords and interconnects all around in addition to identical speaker cables.) I don't know from personal experience if this is as critical with an active outboard crossover (I do know that some have found it to be so), but as far as I can see I'm probably gonna stay 'passive' and never try going that route, for some of the reasons (among others) mentioned by various posters above. Not that I doubt the benefits of active multi-amping if done properly -- in fact, I've always found it somewhat surprising that there haven't been more high-end manufacturers designing complete integrated crossover/amp/speaker systems where each driver gets its own dedicated amplifier.

Would the use of a single amplifier with megawatt output, used with medium-efficiency speakers, negate any possible additional benefit of biamping?

Psag: Does the megawatt amp allow you to take more control over the system and optimize to your preference?

"Would the use of a single amplifier with megawatt output, used with medium-efficiency speakers, negate any possible additional benefit of biamping?"

In almost every case, yes.