I bi-amped a pair of Legacy Focus speakers for years with no problem. I used the XM9 Electronic Crossover (marchandelec.com), instructions here Electronic (marchandelec.com). I used a Cary tube amp for the high frequencies and a Parasound amp for the low frequencies. You pick the crossover frequency when you order the crossover. It’s easily changed if you like with a $10 chip. Easy-peazey. Only reason I went back to a single amp was because I downsized my listening room and the heat from the tube amp was unbearable (I live in FL). I don’t really miss bi-amping though since there are many great amps that make it unnecessary.
