Passive bi-amping does offer some slight benefits but definitely not as much as active.
I think it used to be the case that the 'champions' of analogue actives for hifi use, Naim & Linn, originally offered you the choice of single terminals on a passive crossover or multiple terminals for use with an external active. Their shared opinion was that if you wanted to waste your money on bi-amping, you might as well do it properly!

Mark
G68, baby Genelecs, Humax Foxsat, Oppo+Vanity93, Toshiba HD-A35, Pioneer CLD-925 + Meridian 519, various other random bits and bobs
Got a black G08.2 you want to sell?