Somehow, to use the 3 Pioneers you mentioned to run bi-amp is not really a good idea after i'm played with one of my cars as i was initially planning on going bi-amp via the 8650 as well, BUT, the lowest choice for highpass for the front/tweeter RCAs is at a very high 1.6kHz(if not mistaken, can't remember now) as the lowest setting, the P80 only got slightly better but still above 1kHz, so far i only find that Alpine has the capability to go below 1kHz for the front/tweeter highpass

Hm... actually there's another crossover that can go 3-way, just that it's lack of exposure, the AudioControl 4XS can actually do 4-way front stage + subwoofer, total 5-pairs of output

Yeah... it's analog and chip based, a bit of a troublesome when doing the tuning, but at least, i'll know the accurate point of crossover Maybe i'm juz always trying to be perfect, which i'm not

I now have 2 setups in 2 different cars, one fully digital so to speak, and the other is fully analog