Each 'slope' adds 90 degrees of phase chift.....so you ALWAYS get phase changes with a crossover. 6db=90degreees......12db=180degrees and so on.
It is even possible to need to wire the mid/tweet out of phase with the woofer if you use a 12 db slope. That puts 'em back in mechanical phase.
As for SS / Tube for biamping? Other considerations exist. For example....does the sound take the same amount of time to go thru each amp? This will be a real issue at and around crossover where it would be nice if the music was all 'of a piece'......
Another consideration is power to each amp. If the crossover is around 500 to 600hz....you will need equal power above and below the crossover. Higher frequencies of crossover progressively use a smaller percentage of total power needed. Above say....10Khz, you may only need 15% of the total power.
I think 'active' is the way to go. But be sure to use amps with matching gain structure.
It is even possible to need to wire the mid/tweet out of phase with the woofer if you use a 12 db slope. That puts 'em back in mechanical phase.
As for SS / Tube for biamping? Other considerations exist. For example....does the sound take the same amount of time to go thru each amp? This will be a real issue at and around crossover where it would be nice if the music was all 'of a piece'......
Another consideration is power to each amp. If the crossover is around 500 to 600hz....you will need equal power above and below the crossover. Higher frequencies of crossover progressively use a smaller percentage of total power needed. Above say....10Khz, you may only need 15% of the total power.
I think 'active' is the way to go. But be sure to use amps with matching gain structure.