I'll agree that all of the above posts make good points. I have a pair of Magnepan 3.6s that I use with an active crossover. Fortunately, Magenpan provides you with the crossover points and slopes required in the active crossover. If you do not know what freq points/slopes you require, it could be tough to get it right. I chose the Marchand XM126 tube crossover. Mainly because it could be set up for the 18db 250hz low pass and 6db 200hz high pass crossover points. As for the results, having my CA-400 (SS) connected directly to the bass panels provided a more solid (controlled?) bass. I use a Cary SLA 70 (tube) for the top end. The top end really opened up for me and became even more detailed. Vocals were always great, I didn't notice as dramatic an improvent. Going active is a major step, be prepaired to fine tune for a while. It took over a month for me to get everything dialed in perfectly. It's almost like starting over, but the end result payed off.
Tube/Solid State Bi-Amplification
I've read about people bi-amping using solid state for lows and tube amps for mids and highs. How is this practically done? I have bi-amp capable speakers but I only have one input on my preamp. What additional equipment would I need to buy and is it readily available? Not to mention, are the results worth all this effort? Has anyone done this??